| 10398 | J. Bruce Wallace, S.L. Eggert | 2009 | Terrestrial and Longitudinal Linkages of Headwater Streams | Wallace, J.B. and S.L. Eggert. 2009. Terrestrial and longitudinal linkages of headwater
streams. In Canaan Valley and its Environs: A Landscape Heritage Celebration. Canaan
Valley Institute, Davis, West Virginia.
http://www.canaanvi.org/canaanvi_web/uploadedFiles/Events/Past_Events/Wallace%20&
%20Eggert%20Paper.pdf | Journal Article | Headwater streams are important habitats for aquatic invertebrates, amphibians and fish.
Within forested regions, headwater streams combined with adjacent forests and riparian zones are sites of organic matter deposition, storage, processing, and subsequent transport. In most streams draining deciduous forest, this organic matter from the surrounding forest provides the major fuel for the ecosystem.
| 10397 | J. Bruce Wallace, S.L. Eggert | 2009 | Benthic Invertebrate Fauna, Small Streams | Wallace, J., Eggert, S. 2009. Benthic Invertebrate Fauna, Small Streams. Encyclopedia of Inland Waters, 2: 173-190 | Journal Article | Small streams (first- through third-order streams) make up >98% of the total number of stream segments and >86% of stream length in many drainage networks. Small streams occur over a wide array of climates, geology, and biomes, which influence temperature, hydrologic regimes, water chemistry, light, substrate, stream permanence, a basin’s terrestrial plant cover, and food base of a given stream.
| 10396 | Noel Cressie, Catherine A. Calder, James S. Clark, Jay M. Ver Hoef, and Christopher K. Wikle | 2009 | Accounting for uncertainty in ecological analysis: the strengths and limitations of hierarchical statistic modeling | Noel, C., Calder, C., Clark, J., Ver Hoef, J., Wikle, C. 2009. Accounting for uncertainty in ecological analysis: the strengths and limitations of hierarchical statistic modeling. The Ecological Society of America, 19(3): 553-570 | Journal Article | Analyses of ecological data should account for the uncertainty in the process(es) that generated the data. However, accounting for these uncertainties is a difficult task, since ecology is known for its complexity.
| 10395 | K.S. Simon, M.A. Simon, and E.F. Benfield | 2009 | Variation in ecosystem function in Appalachian streams along an acidity gradient | Simon, K., Simon, M., Benfield, E. 2009. Variation in ecosystem function in Appalachian streams along an acidity gradient. The Ecological Society of America, 19(5): 1147-1160 | Journal Article | Acidification is a widespread phenomenon that damages aquatic systems, and it has been the focus of intensive management efforts. While most management has focused on community structure as an endpoint, ecosystem function is also sensitive to acidification and important in stream health.
| 10394 | Jennifer M. Fraterrigo and James A. Rusak | 2008 | Disturbance-driven changes in the variability of ecological patterns and processes | Fraterrigo, J. M. and J. A. Rusak. 2008. Disturbance-driven changes in the variability of ecological patterns and processes. Ecology Letters 11:756-770 | Journal Article | Understanding how disturbance shapes the dynamics of ecological systems is of fundamental importance in ecology. One emerging approach to revealing and appreciating disturbance effects involves examining disturbance-driven changes in the variability of ecological responses.
| 10393 | E.N.J. Brookshire, H.M. Valett, and S. Gerber | 2009 | Maintenance of terrestrial nutrient loss signatures during in-stream transport | Brookshite, E.N.J, Valett, H.M., Gerber, S. 2009. Maintenance of terrestrial nutrient loss signatures during in-stream transport. The Ecological Society of America, 90(2): 293-299 | Journal Article | Small streams account for the majority of channel length in river basins worldwide and are the primary conveyors of terrestrial nutrients to rivers and ultimately the oceans. The controls of stream nutrient fluxes, however, are debated. Classical models emphasize that nutrient transport in streams integrates nutrient cycling in the terrestrial watershed while others argue that in-stream processes control nutrient flux.
| 10392 | T. C. Hales, C. R. Ford, T. Hwang, J. M. Vose and L. E. Band | 2009 | Topographic and ecologic controls on root reinforcement | Hales, T., Ford, C., Hwang, T., Vose, J., Band, L. Topographic and ecologic controls on root reinforcement. Journal of Geophysical Research, 114: F03013 | Journal Article | Shallow landslides are a significant hazard in steep, soil-mantled landscapes. During intense rainfall events, the distribution of shallow landslides is controlled by variations in landscape gradient, the frictional and cohesive properties of soil and roots, and the subsurface hydrologic response. While gradients can be estimated from digital elevation models, information on soil and root properties remains sparse.
| 10391 | James S. Clark | 2009 | Beyond neutral science | James S. Clark. 2009. Beyond Neutral Science. Trends in Ecology and Evolution, 24 (1): 8-15 | Journal Article | Biodiversity science is unusual in that an emerging paradigm is not based on a specific process, but rather depends largely on stochastic elements, perceived as neutral forces. Here I suggest that these forces, which have been justified, in part, by the concepts of symmetry and equalizing mechanisms, have application to the understanding of stochastic models but do not constitute forces that operate in nature.
| 10390 | Ben Strauss | 2007 | Snails at three scales: Interplay of stream hydrology and hydraulics with the morphology, dispersal and distribution of Elimia proxima | Strauss, B. 2007. Snails at three scales: Interplay of stream hydrology and hydraulics with the morphology, dispersal and distribution of Elimia proxima | Graduate Publication
(Dissertation) | This thesis quantifies effects of hydraulic environment and flooding disturbance on the ecology and evolution of benthic stream macroinvertebrates from organismal to landscape scales, utilizing the snail Elimia proxima as a model species. Recent research has complicated views about the nature of flow environments near stream beds and of the organismal shapes best equipped to cope with them.
| 10389 | Katherine J. Elliott, Wayne T. Swank | 2008 | Long-term changes in forest composition and diversity following early logging (1919–1923) and the decline of American chestnut (Castanea dentata) | Elliott, K., Swank, W. 2008. Long-term changes in forest composition and diversity following early logging (1919–1923) and the decline of American chestnut (Castanea dentata). Plant Ecology, 197(2):155-172 | Journal Article | Chestnut blight fungus (Endothia parasitica [Murr.] P.J. And. & H.W. And.)) is a classic example of an invasive species, which severely damaged populations of its host, Castanea dentata, and had widespread and long-term impacts on eastern North American forests. Concurrently, forests were further disturbed by lumbering, which was common across the region from the mid 1800s to the early 1900s.
| 10388 | C. D. Camp,W. E. Peterman, J. R. Milanovich, T. Lamb, J. C. Maerz & D. B. Wake | 2009 | A new genus and species of lungless salamander (family Plethodontidae) from the Appalachian highlands of the south-eastern United States | Camp, C., Peterman, W., Milanovich, J., Lamb, T., Maerz, J., Wake, D. 2009. A new genus and species of lungless salamander (family Plethodontidae) from the Appalachian highlands of the south-eastern United States. Journal of Zoology, 279(1): 86-94 | Journal Article | We describe a striking new species of the lungless salamander family Plethodontidae from the Appalachian foothills of northern Georgia, USA. This miniature species, c. 25–26mm (adult standard length), is so distinctive genetically and morphologically that we erect a new genus, the first new genus of amphibian described from the US in nearly 50 years.
| 10387 | R. Jaffe, D. McKnight, N. Maie, R. Cory,W. H. McDowell, and J. L. Campbell | 2008 | Spatial and temporal variations in DOM composition in ecosystems: The importance of long-term monitoring of optical properties | Jaffe, R., McKnight, D., Maie, N., Cory, R., McDowell, W., Campbell, J. 2008. Spatial and temporal variations in DOM composition in ecosystems: The importance of long-term monitoring of optical properties. Journal of Geophysical Research, 113(G4):G04032 | Journal Article | Source, transformation, and preservation mechanisms of dissolved organic matter (DOM) remain elemental questions in contemporary marine and aquatic sciences and represent a missing link in models of global elemental cycles. Although the chemical character of DOM is central to its fate in the global carbon cycle, DOM characterizations in long-term ecological research programs are rarely performed.
| 10386 | Dana M. Cook, Emily DeCrescenzo Henriksen, Rima Upchurch, and Joy B. Doran Peterson | 2007 | Isolation of Polymer-Degrading Bacteria and Characterization of the Hindgut Bacterial Community from the Detritus-Feeding Larvae of Tipula abdominalis (Diptera: Tipulidae) | Cook, D., DeCrescenzo, E., Upchurch, R., Peterson, J. 2007. Isolation of Polymer-Degrading Bacteria and Characterization of the Hindgut Bacterial Community from the Detritus-Feeding Larvae of Tipula abdominalis (Diptera: Tipulidae). Applied and Environmental Microbiology, 73(17): 5683-5686 | Journal Article | The Tipula abdominalis larval hindgut microbial community presumably facilitates digestion of the lignocellulosic diet. The microbial community was investigated through characterization of bacterial isolates and analysis of 16S rRNA gene clone libraries. This initial study revealed novel bacteria and provides a framework for future studies of this symbiosis.
| 10385 | Vladislav Gulis, Keller Suberkropp, and Amy D. Rosemond | 2008 | Comparison of Fungal Activities on Wood and Leaf Litter in Unaltered and Nutrient-Enriched Headwater Streams | Gulis, V., Suberkropp, K., Rosemond, A. 2008. Comparison of Fungal Activities on Wood and Leaf Litter in Unaltered and Nutrient-Enriched Headwater Streams. Applied and Environmental Microbiology. 74(4):1094-1101 | Journal Article | Fungi are the dominant organisms decomposing leaf litter in streams and mediating energy transfer to other trophic levels. However, less is known about their role in decomposing submerged wood. This study provides the first estimates of fungal production on wood and compares the importance of fungi in the decomposition of submerged wood versus that of leaves at the ecosystem scale.
| 10384 | Steven A. Thomas, H. Maurice Valett, Jackson R. Webster, Patrick J. Mulholland | 2003 | A regression approach to estimating reactive solute uptake in advective and transient storage zones of stream ecosystems | Thomas, S., Valett, H., Webster, J., Mulholland, P. 2003. A regression approach to estimating reactive solute uptake in advective and transient storage zones of stream ecosystems. Advances in Water Resources, 26: 965–976 | Journal Article | A method is developed, the Regression Partitioning Method (RPM), for estimating the proportion of reactive solute uptake occurring within transient storage zones of streams. The RPM is a technique for analyzing solute addition data in which whole
stream uptake (mgm 2 d 1) is determined from the longitudinal pattern in plateau tracer concentrations.
| 10383 | John K. Moulton | 2003 | Can the current molecular arsenal adequately track rapid divergence events within Simuliidae (Diptera)? | Moulton, J. 2003. Can the current molecular arsenal adequately track rapid divergence events within Simuliidae (Diptera)? Molecular Phylogenetics and Evolution, 27: 45–57 | Journal Article | Ancient rapid divergence events, such as those that took place during the Mesozoic, are pervasive in evolution and represent a major challenge to phylogenetic biologists. The number of molecular phylogenetic studies in which rapid divergence has been invoked to account for poor phylogenetic resolution has steadily increased over the past few years.
| 10382 | J. R. Webster, J. D. Newbold, S. A. Thomas, H. M. Valett and P. J. Mulholland | 2009 | Nutrient Uptake and Mineralization during Leaf Decay in Streams – a Model Simulation | Webster, J., Newbold, J., Thomas, S., Valett, H., Mulholland, P. 2009. Nutrient Uptake and Mineralization during Leaf Decay in Streams – a Model Simulation. International Review of Hydrobiology, 97(4): 372-390 | Journal Article | We developed a stoichiometrically explicit computer model to examine how heterotrophic uptake of nutrients and microbial mineralization occurring during the decay of leaves in streams may be important in modifying nutrient concentrations. The simulations showed that microbial uptake can substantially decrease stream nutrient concentrations during the initial phases of decomposition, while mineralization may produce increases in concentrations during later stages of decomposition.
| 10381 | Christopher K. Beachy, Richard C. Bruce | 2003 | Life history of a small form of the plethodontid salamander Desmognathus quadramaculatus | Beachy, C., Bruce, R. 2003. Life history of a small form of the plethodontid salamander Desmognathus quadramaculatus. Amphibia-Reptilia, 24 (1): 13-26 | Journal Article | We sampled Desmognathus quadramaculatus, one of the largest species of plethodontid salamanders in eastern North America, from a population exhibiting extremely small adult body sizes in the Bald Mountains of North Carolina (USA). In order to test the hypothesis that miniaturization in desmognathine salamanders is due to early metamorphosis and maturation, we estimated ages and sizes at metamorphosis and maturation.
| 10380 | Ryan William Kirk - University of Minnesota | 2009 | Land Use and Terrestrial Carbon Storage in Western North Carolina from 1850-2030: A Historical Reconstruction and Simulation Study | Kirk, W. 2009. Land Use and Terrestrial Carbon Storage in Western North Carolina from 1850-2030: A Historical Reconstruction and Simulation Study. [dissertation]. Minneapolis (MN): University of Minnesota | Graduate Publication
(Dissertation) | The Southern Appalachian Mountains have experienced large and dynamic landuse changes since arrival of Euro-American settlers in the late 18th and early 19th centuries. Following transfer of the land from Native American societies, successive
waves of immigration, development, resource extraction, and abandonment have driven land use over the past 200 years. There are large uncertainties regarding the timing and magnitude of these changes, and as a result, there are large uncertainties on the effects these land use legacies have on ecological processes and services.
| 10379 | Michael Scott Strickland - University of Georgia | | Ecosystem Carbon Cycling: Relationships to Soil Microbial Community Structure | Strickland, M.S. 2009. Ecosystem Carbon Cycling: Relationships to Soil Microbial Community Structure. [dissertation]. Athens (GA): University of Georgia. | Graduate Publication
(Dissertation) | Many processes related to carbon-cycling in terrestrial ecosystems are carried out by soil microbes. Our understanding of the relationship between carbon cycling and microbial community structure is, at best, rudimentary. The role of microbial community structure in carbon-cycling processes has, for the most part, been treated as either functionally redundant or driven by binary distinctions (e.g. fungal:bacterial ratios). It was the purpose of this work to test these generalizations and advance our understanding how soil microbes regulate ecosystem carbon dynamics.
| 10378 | Jonathan P. Benstead, Amy D. Rosemond, Wyatt F. Cross, J. Bruce Wallace, Sue L. Eggert, Keller Suberkropp, Vladislav Gulis, Jennifer L. Greenwood, and Cynthia J. Tant | 2009 | Nutrient enrichment alters storage and fluxes of detritus in a headwater stream ecosystem | Benstead, J., Rosemond, A., Cross, W., Wallace, J., Eggert, S., Suberkropp, K., Gulis, V., Greenwood, J., Tant, C. 2009. Nutrient enrichment alters storage and fluxes of detritus in a headwater stream ecosystem. Ecology, 90(9):2556-2566 | Journal Article | Responses of detrital pathways to nutrients may differ fundamentally from pathways involving living plants: basal carbon resources can potentially decrease rather than increase with nutrient enrichment. Despite the potential for nutrients to accelerate heterotrophic processes and fluxes of detritus, few studies have examined detritus–nutrient dynamics at whole-ecosystem scales.
| 10377 | Wyatt F. Cross, J. Bruce Wallace, and Amy D. Rosemond | 2007 | Nutrient enrichment reduces constraints on material flows in a detritus-based food web | Cross, W., Wallace, J., Rosemond, A. 2007. Nutrient enrichment reduces constraints on material flows in a detritus-based food web. Ecology, 88(10): 2563-2575 | Journal Article | Most aquatic and terrestrial ecosystems are experiencing increased nutrient availability, which is affecting their structure and function. By altering community composition and productivity of consumers, enrichment can indirectly cause changes in the pathways and magnitude of material flows in food webs. These changes, in turn, have major consequences for material storage and cycling in the ecosystem.
| 10376 | Jennifer L. Greenwood, Amy D. Rosemond, J. Bruce Wallace, Wyatt F. Cross, Holly S. Weyers | 2007 | Nutrients stimulate leaf breakdown rates and detritivore biomass: bottom-up eVects via heterotrophic pathways | Greenwood, J., Rosemond, A., Wallace, J., Cross, W., Weyers, H. 2007. Nutrients stimulate leaf breakdown rates and detritivore biomass: bottom-up eVects via heterotrophic pathways. Oecologia, 151:637-649 | Journal Article | Most nutrient enrichment studies in aquatic systems have focused on autotrophic food webs in systems where primary producers dominate the resource base. We tested the heterotrophic response to longterm nutrient enrichment in a forested, headwater stream. Our study design consisted of 2 years of pretreatment data in a reference and treatment stream and 2 years of continuous nitrogen (N) + phosphorus addition to the treatment stream.
| 10375 | Susan L. Eggert, J. Bruce Wallace | 2003 | Reduced detrital resources limit Pycnopsyche gentilis (Trichoptera: Limnephilidae) production and growth | Eggert, S., Wallace, J. 2003. Reduced detrital resources limit Pycnopsyche gentilis (Trichoptera: Limnephilidae) production and growth. The North American Benthological Society, 22(3):388-400 | Journal Article | Leaf inputs in temperate forest streams may limit caddisfly production because leaf detritus serves both as a food and case-material resource. We estimated Pycnopsyche gentilis production in a stream experimentally decoupled from its riparian habitat and a reference stream for 8 y in the southern Appalachians. We also examined laboratory survivorship, growth, and case-building activities of P gentilis in substrate containing various quantities of leaf material.
| 10374 | Wyatt F. Cross, Jonathan
P. Benstead, Amy D. Rosemond and J. Bruce Wallace | 2003 | Consumer-resource stoichiometry in detritus-based streams | Cross, W., Benstead, J., Rosemond, A., Wallace, J. 2003. Consumer-resource stoichiometry in detritus-based streams. Ecology Letters, 6:721-732 | Journal Article | Stoichiometric relationships between consumers and resources in detritus-based ecosystems have received little attention, despite the importance of detritus in most food webs. We analysed carbon ©, nitrogen (N), and phosphorus (P) content of invertebrate consumers, and basal food resources in two forested headwater streams (one reference and the other nutrient-enriched).
| 10373 | Sara G. Baer, Edward R. Siler, Susan L. Eggert, and J. Bruce Wallace | 2001 | Colonization and production of macroinvertebrates on artificial substrata: upstream-downstream responses to a leaf litter exclusion manipulation | Baer, S., Siler, E., Eggert, S., Wallace, J. 2001. Colonization and production of macroinvertebrates on artificial substrata: upstream-downstream responses to a leaf litter exclusion manipulation. Freshwater Biology, 46: 347-365 | Journal Article | 1. Macroinvertebrate colonization dynamics were examined on artificial substrata in a stream with terrestrial litter inputs excluded, downstream of the litter exclusion treatment, and in a reference stream.
2. Short-term examination of the rates of organic matter accrual and invertebrate colonization demonstrated significantly lower accumulation of leaf detritus and invertebrates in the litter-excluded reach and a short distance downstream of that reach.
| 10372 | Arthur C. Benke, Alexander D. Huryn, Leonard A. Smock, and J. Bruce Wallace | 1999 | Length-mass relationships for freshwater macroinvertebrates in North America with particular reference to the southeastern United States | Benke, A., Huryn, A., Smock, L., Wallace, J. 1999. Length-mass relationships for freshwater macroinvertebrates in North America with particular reference to the southeastern United States. The North American Benthological Society, 18(3):308-343 | Journal Article | Estimation of invertebrate biomass is a critical step in addressing many ecological ques- tions in aquatic environments. Length-dry mass regressions are the most widely used approach for estimating benthic invertebrate biomass because they are faster and more precise than other methods.
| 10371 | Ge Sun, Changqing Zuo, Shiyu Liu, Mingliang Liu, Steven G. McNulty, and James M. Vose | 2008 | Watershed Evapotranspiration Increased Due To Changes In Vegetation Composition And Structure Under A Subtropical Climate | Sun, G., Zuo, C., Liu, S., Liu, M., McNulty, S.G., Vose, J.M. 2008. Watershed Evapotranspiration Increased Due To Changes In Vegetation Composition And Structure Under A Subtropical Climate. | Journal Article | Natural forests in southern China have been severely logged due to high human demand for timber, food, and fuels during the past century, but are recovering in the past decade. The objective of this study was to investigate how vegetation cover changes in composition and structure affected the water budgets of a 9.6-km2 Dakeng watershed located in a humid subtropical mountainous region in southern China.
| 10370 | P. D. Hazelton, G. D. Grossman | 2009 | Turbidity, velocity and interspecific interactions affect foraging behaviour of rosyside dace (Clinostomus funduloides) and yellowfin shiners (Notropis lutippinis) | Hazelton, P.D., Grossman, G.D. 2009. Turbidity, velocity and interspecific interactions affect foraging behaviour of rosyside dace (Clinostomus funduloides) and yellowfin shiners (Notropis lutippinis). Ecology of Freshwater Fish, 18:427-436 | Journal Article | Fish diversity is strongly affected by habitat degradation (e.g., increased turbidity) and invasive species. We examined the effects of turbidity, velocity, length, dominance and intra- and interspecific competition on focal point depth, movement rate, dominance and aggression rate in native rosyside dace (Clinostomus funduloides) and invasive yellowfin shiners (Notropis lutipinnis) in a southern Appalachian stream (NC, USA).
| 10369 | S. L. Eggert, J. B. Wallace | 2007 | Wood biofilm as a food resource for stream detritivores | Eggert, S.L., Wallace, J.B. 2007. Wood biofilm as a food resource for stream detritivores. Limnology and Oceanography, 52(3): 1239-1245 | Journal Article | Published assimilation efficiencies indicate that leaf detritus is a more nutritious food for stream invertebrates than wood. Some studies, however, suggest that wood and wood biofilms (epixylon) may be an important but overlooked resource. We measured assimilation efficiencies of three detritivores for leaves and epixylon and compared attributes of grazed versus ungrazed wood epixylon to assess its use by detritivores.
| 10368 | Jennifer D. Knoepp, Barton D. Clinton | | Riparian zones in southern Appalachian headwater catchments: Carbon and nitrogen responses to forest cutting | Knoepp, J.D., Clinton, B.D. Riparian zones in southern Appalachian headwater catchments: Carbon and nitrogen responses to forest cutting. Forest Ecology and Management | Journal Article | There is little understanding about the role eastern US forested headwater riparian areas play in protecting aquatic habitats and water quality from impacts of side slope forest harvest. To better understand this important riparian area function, we selected three sites frommanagement units with a 2-age regeneration silvicultural prescription located on the Nantahala National Forest, North Carolina, USA.
| 10367 | Jennifer D. Knoepp, Katherine J. Elliott, Barton D. Clinton, and James M. Vose | 2009 | Effects of prescribed fire in mixed oak forests of the southern Appalachians: forest floor, soil, and soil solution nitrogen responses | Knoepp, J.D., Elliott, K.J., Clinton, B.D., Vose, J.M. 2009. Effects of prescribed fire in mixed oak forests of the southern Appalachians: forest floor, soil, and soil solution nitrogen responses. Journal oj the Torrey Botanical Society, 136(3): 380-391 | Journal Article | We examined nutrient cycling responses to prescribed fire on three sub-mesic, mixed-oak sites located in the Blue Ridge Physiographic province of the southern Appalachian Mountains: Alarka Laurel Branch (AL), Robin Branch (RB), and Roach Mill Branch (RM). Each study site was located within a sub-watershed that drained a first order stream. Our objective was to quantify the effects of prescribed burning on forest floor mass, nitrogen and carbon pools; and soil and soil water available nitrogen.
| 10366 | J. M. Grace III, B. D. Clinton | 2007 | Protecting Soil and Water in Forest Road Management | Grace III, J.M., Clinton, B.D. 2007. Protecting Soil and Water in Forest Road Management. American Society of Agricultural and Biological Engineers, 50(5): 1579-1584 | Journal Article | The National Forest road system is the network that supports public recreation, which has become the primary
use of the public lands. The pattern of use of National Forest roads for recreation has increased dramatically since the late
1940s and is expected to continue to increase beyond the rates observed today. However, research over the past 60 years
clearly presents forest roads as a major source of sediment and soil erosion from forest watersheds.
| 10365 | Peter D. Hazelton and Gary D. Grossman | 2009 | The effects of turbidity and an invasive species on foraging success of rosyside dace (Clinostomus funduloides) | Hazelton, P.D., Grossman, G.D. 2009. The effects of turbidity and an invasive species on foraging success of rosyside dace (Clinostomus funduloides). Freshwater Biology, 54: 1977-1989 | Journal Article | 1. Habitat degradation and biological invasions are important threats to fish diversity worldwide. We experimentally examined the effects of turbidity, velocity and intra- and interspecific competition on prey capture location, reactive distance and prey capture
success of native rosyside dace (Clinostomus funduloides) and invasive yellowfin shiners (Notropis lutipinnis) in Coweeta Creek, North Carolina, U.S.A.
| 10363 | Negussie Hailu Tedela | 2009 | Rainfall-Runoff Relationships for Small, Mountainous, Forested Watersheds in the Eastern United States | Tedela, N.G. 2009. Rainfall-Runoff Relationships for Small, Mountainous, Forested Watersheds in the Eastern United States. [dissertation]. Athens (GA): University of Georgia. | Graduate Publication
(Dissertation) | Runoff is a complex interaction between precipitation and landscape factors. While some of these factors (e.g., land use and cover, topography, soil characteristics, and hydrologic condition) have been defined for urban, rangeland, and agricultural drainages, runoff from mountainous, forested watersheds is poorly understood, especially in the eastern United States.
This study investigated the response of streamflow to rainfall on ten gaged, small watersheds in the mountainous forests of the eastern United States using two methods to estimate runoff; the semi-empirical curve number method, and the semi-distributed TOPMODEL.
| 10362 | Tim Kuhman - University of Wisconsin | 2009 | The Influence of Past and Present Land Use on Non-Native Plant Invasion in the Southern Appalachians | Kuhman, T.R. 2009. The Influence of Past and Present Land Use on Non-Native Plant Invasion in the Southern Appalachians. [dissertation]. Madison (WI): University of Wisconsin. | Graduate Publication
(Dissertation) | Some non-native invasive plants are well adapted for spread in forested landscapes. Such species pose a threat to forest communities in the southern Appalachians. Both contemporary and historic land use can affect invasion by non-native plants. Factors related to land use, the biotic community, and the abiotic template were investigated at local to regional scales in
western North Carolina to determine their roles in shaping the distributions of forest invaders.
| 10361 | Christopher John Frost - University of Georgia | 2005 | Direct and Indirect Effects of Insect Herbivores on Terrestrail Ecosystem Processes | Frost, C.J. 2005. Direct and Indirect Effects of Insect Herbivores on Terrestrail Ecosystem Processes. [dissertation]. Athens (GA): University of Georgia. | Graduate Publication
(Dissertation) | Herbivores can influence terrestrial ecosystem functioning through a number of mechanisms. Deposition of waste products (‘frass’) introduces labile nitrogen (N) and other nutrients directly to the soil, potentially altering soil N availability. Herbivores stimulate changes in the chemistry and nutrient allocation patterns of plant tissues, which may indirectly affect N uptake dynamics and ecosystem N cycling. These processes occur rapidly and are “fast” cycle components of the terrestrial N cycle.
| 10360 | Ines Ibanez, James S. Clark and Michael C. Dietze | 2008 | Evaluating the Sources of Potential Migrant Species: Implications Under Climate Change | Ibanez, I., Clark, J.S., Dietze, M.C. 2008. Evaluating the Sources of Potential Migrant Species: Implications Under Climate Change. Ecological Applications, 18(7): 1664-1678. | Journal Article | As changes in climate become more apparent, ecologists face the challenge of predicting species responses to the new conditions. Most forecasts are based on climate envelopes (CE), correlative approaches that project future distributions on the basis of the
current climate often assuming some dispersal lag. One major caveat with this approach is that it ignores the complexity of factors other than climate that contribute to a species’ distributional range. To overcome this limitation and to complement predictions based on CE modeling we carried out a transplant experiment of resident and potential-migrant species.
| 10359 | Susan C. Walls | 2009 | The role of climate in the dynamics of a hybrid zone in Appalachian salamanders | Walls, S.C. 2009. The role of climate in the dynamics of a hybrid zone in Appalachian salamanders. Global Change Biology, 15: 1903-1910. | Journal Article | I examined the potential influence of climate change on the dynamics of a previously studied hybrid zone between a pair of terrestrial salamanders at the Coweeta Hydrologic Laboratory, U.S. Forest Service, in the Nantahala Mountains of North Carolina, USA. A 16-year study led by Nelson G. Hairston, Sr. revealed that Plethodon teyahalee and Plethodon shermani hybridized at intermediate elevations, forming a cline between ‘pure’ parental P. teyahalee at lower elevations and ‘pure’ parental P. shermani at higher elevations.
| 10358 | Benjamin C. Jones, Jennifer L. Kleitch, Craig A. Harper, David A. Buehler | 2008 | Ruffed grouse brood habitat use in a mixed hardwood forest: Implications for forest management in the Appalachians | Jones, B.C., Kleitch, J.L., Harper, C.A., Buehler, D.A. 2008. Forest and Ecology Management 255: 3580-3588 | Journal Article | Brood habitat quality and availability may be a limiting factor for ruffed grouse (Bonasa umbellus) populations in the central and southern Appalachians.We measured brood habitat characteristics at forest stand and microhabitat scales in western North Carolina. From 2000 to 2004, we monitored radiotagged females with broods (n = 36) from hatch to 5 weeks post-hatch.
| 10357 | Jennifer L. Greenwood and Amy D. Rosemond | 2005 | Periphyton response to long-term nutrient enrichment in a shaded headwater stream | Greenwood, J.L., Rosemond, A.D. 2005. Periphyton response to long-term nutrient enrichment in a shaded headwater stream. Canadian Journal of Fish and Aquatic Science, 62:2033-2045. | Journal Article | We maintained elevated but moderate concentrations of nitrogen and phosphorus continuously for 2 years in a heavily shaded headwater stream and compared effects on stream periphyton with a reference stream. Both streams were sampled for 1 year before treatment. Some measures of periphyton biomass (ash-free dry mass and chlorophyll a) responded positively to enrichment. Increased chlorophyll a was likely a result of higher chlorophyll per cell, as total algal biovolume did not change with enrichment.
| 10356 | S.L. Eggert, J.B. Wallace | 2007 | Wood biofilm as a food resource for stream detritivores | Eggert, S.L., Wallace, J.B. 2007. Wood biofilm as a food resource for stream detritivores. Limnology and Oceanography, 52(3): 1239-1245. | Journal Article | Published assimilation efficiencies indicate that leaf detritus is a more nutritious food for stream invertebrates than wood. Some studies, however, suggest that wood and wood biofilms (epixylon) may be an important but overlooked resource. We measured assimilation efficiencies of three detritivores for leaves and epixylon and compared attributes of grazed versus ungrazed wood epixylon to assess its use by detritivores. Pycnopsyche gentilis (Trichoptera), Tipula abdominalis (Diptera), and Tallaperla spp. (Plecoptera) assimilated epixylon more efficiently (26–36%) than leaf detritus (9–17%).
| 10355 | Marcelo Ardon, Catherine M. Pringle, Susan L. Eggert | 2006 | Does leaf chemistry differentially affect breakdown in tropical vs temperate streams? Importance of standardized analytical techniques to measure leaf chemistry | Ardon, M., Pringle, C.M., Eggert, S.L. 2009. Does leaf chemistry differentially affect breakdown in tropical vs temperate streams? Importance of standardized analytical techniques to measure leaf chemistry. North American Benthological Society, 28(2):440-453. | Journal Article | Comparisons of the effects of leaf litter chemistry on leaf breakdown rates in tropical vs temperate streams are hindered by incompatibility among studies and across sites of analytical methods used to measure leaf chemistry. We used standardized analytical techniques to measure chemistry and breakdown rate of leaves from common riparian tree species at 2 sites, 1 tropical and 1 temperate
| 10354 | Jennifer L. Greenwood, Amy D. Rosemond, J. Bruce Wallace, Wyatt F. Cross, Holly S. Weyers | 2007 | Nutrients stimulate leaf breakdown rates and detritivore biomass: bottom-up eVects via heterotrophic pathways | Greenwood, J.L., Rosemond, A.D., Wallace, J.B., Cross, W.F., Weyers, H.S. 2007. Nutrients stimulate leaf breakdown rates and detritivore biomass: bottom-up eVects via heterotrophic pathways. Oecologia, 151:637-649. | Journal Article | Most nutrient enrichment studies in aquatic systems have focused on autotrophic food webs in systems where primary producers dominate the resource base. We tested the heterotrophic response to longterm nutrient enrichment in a forested, headwater
stream. Our study design consisted of 2 years of pretreatment data in a reference and treatment stream and 2 years of continuous nitrogen (N) + phosphorus addition to the treatment stream.
| 10353 | Brent R. Johnson, J. Bruce Wallace, Amy D. Rosemond & Wyatt F. Cross | 2006 | Larval salamander growth responds to enrichment of a nutrient poor headwater stream | Johnson, B.R., Wallace, J.B., Rosemond, A.D., Cross, W.F. 2006. Larval salamander growth responds to enrichment of a nutrient poor headwater stream. Hydrobiologia, 573: 227-232. | Journal Article | While many studies have measured effects of nutrient enrichment on higher trophic levels in grazing food webs, few such studies exist for detritus-based systems. We measured effects of nitrogen and phosphorus addition on growth of larval Eurycea wilderae in a heterotrophic headwater stream using a repeated markrecapture design. Growth estimates for 208 recaptured larvae (control stream n = 92
| 10352 | Gordon R. Plague, J. Bruce Wallace, Jack W. Grubaugh | 1998 | Linkages Between Trophic Variability and Distribution of Pteronarcys spp. (Plecoptera: Pteronarcyidae) Along a Stream Continuum | Plauge, G.R., Wallace, J.B., Grubaugh, J.W. 2009. Linkages Between Trophic Variability and Distribution of Pteronarcys spp. (Plecoptera: Pteronarcyidae) Along a Stream Continuum. American Midland Naturalist, 139(2): 224-234. | Journal Article | Pteronarcys stoneflies, which are traditionally considered shredders in eastern North America, inhabit second- through seventh-order streams in the Little Tennessee River (LTR) drainage basin. Because very little coarse allochthonous particulate organic matter occurs in the relatively large (sixth- and seventh-order) LTR, we analyzed the gut contents of five individuals from each of five sites and two dates (August and December) (n = 50) along a fourth- through seventh-order stretch of this stream continuum.
| 10351 | Allison H. Roy, Amy D. Rosemond, David S. Leigh, Michael J. Paul, J. Bruce Wallace | 2003 | Habitat-Specific Responses of Stream Insects to Land Cover Disturbance: Biological Consequences and Monitoring Implications | Roy, A.H., Rosemond, A.D., Leigh, D.S., Paul, M.J., Wallace, J.B. 2003. Habitat-Specific Responses of Stream Insects to Land Cover Disturbance: Biological Consequences and Monitoring Implications, 22(2):292-307 | Journal Article | Changes in catchment land cover can impact stream ecosystems through altered hydrology and subsequent increases in sedimentation and nonpoint-source pollutants. These stressors can affect habitat suitability and water quality for aquatic invertebrates. We studied the impact of a range of physical and chemical stressors on aquatic insects, and tested whether the effects of these stressors differed in 3 habitat types: riffles, pools, and banks.
| 10350 | J. Todd Petty and Gary D. Grossman | 2009 | Size-Dependent Territoriality of Mottled Sculpin in a Southern Appalachian Stream | Petty, J.T., Grossman, G.D. 2007. Size-Dependent Territoriality of Mottled Sculpin in a Southern Appalachian Stream. Transactions of the American Fisheries Society, 136:1750-1761 | Journal Article | We quantified the space use behaviors of juvenile and adult mottled sculpin Cottus bairdii over a 3-year period in Shope Fork, western North Carolina. Our objectives were to (1) quantify home range size, (2) determine whether the fish exhibit territorial behaviors, (3) characterize the relative stability of territories, and (4) relate temporal variation in behaviors to environmental variability and population size structure.
| 10349 | D.M. Walters, A.H. Roy, D.S. Leigh | 2009 | Environmental indicators of macroinvertebrate and fish assemblage integrity in urbanizing watersheds | Walters, D.M., Roy, A.H., Leigh, D.S. 2009. Environmental indicators of macroinvertebrate and fish assemblage integrity in urbanizing watersheds. Ecological Indicators, 9: 1222-12333 | Journal Article | Urbanization compromises the biotic integrity and health of streams, and indicators of integrity loss are needed to improve assessment programs and identify mechanisms of urban effects. We investigated linkages between landscapes and assemblages in 31 wadeable Piedmont streams in the Etowah River basin in northern Georgia (USA). Our objectives were to identify the indicators of macroinvertebrate and fish integrity from a large set of best land cover
| 10348 | Luke Pangle, James M. Vose, Robert O. Teskey | 2009 | Radiation use efficiency in adjacent hardwood and pine forests in the southern Appalachians | Pangle, L. Vose, J.M., Teskey, R.O. 2009. Radiation use efficiency in adjacent hardwood and pine forests in the southern Appalachians. Forest Ecology and Management, 257: 1034-1042 | Journal Article | The efficiency with which trees convert photosynthetically active radiation (PAR) to biomass has been shown to be consistent within stands of an individual species, which is useful for estimating biomass production and carbon accumulation. However, radiation use efficiency (e) has rarely been measured in mixed-species forests, and it is unclear how species diversitymay affect the consistency of e, particularly across environmental gradients.
| 10347 | Jennifer M. Fraterrigo, Scott M. Pearson, Monica G. Turner | 2009 | Joint effects of habitat configuration and temporal stochasticity on population dynamics | Fraterrigo, J.M., Pearson, S.M., Turner, M.G. 2009. Joint effects of habitat configuration and temporal stochasticity on population dynamics. Landscape Ecol. | Journal Article | Habitat configuration and temporal stochasticity in the environment are recognized as important drivers of population structure, yet few studies have examined the combined influence of these factors. We developed a spatially explicit simulation model to investigate how stochasticity in survival and reproduction influenced population dynamics on landscapes that differed in habitat
configuration.
| 10346 | Jennifer M. Fraterrigo, Scott M. Pearson, Monica G. Turner | 2009 | The response of understory herbaceous plants to nitrogen fertilization in forests of different land-use history | Fraterrigo, J.M., Pearson, S.M., Turner, M.G. 2009. The response of understory herbaceous plants to nitrogen fertilization in forests of different land-use history. Forest Ecology and Management, 257: 2182-2188. | Journal Article | Forests growing on former agricultural land often have reduced frequencies of many native forest herbs compared with forests that were never cleared for agriculture. A leading explanation for this pattern is thatmany forest herbs are dispersal limited, but environmental conditionsmay also hinder colonization. We examined the response of six forest herb taxa
| 10343 | Mark A. Bradford, Matthew D. Wallenstein, Steven D. Allison, Kathleen K. Treseder, Serita D. Frey, Brian W. Watts, Christian A. Davies, Thomas R. Maddox, Jerry M. Melillo, Jacqueline E. Mohan and James F. Reynolds | 2009 | Decreased mass specific respiration under experimental warming is robust to the microbial biomass method employed | Bradford, M.A., et al. 2009. Decreased mass specific respiration under experimental warming is robust to the microbial biomass method employed. Ecology Letters, 12: E15-E18. | Journal Article | Hartley et al. question whether reduction in Rmass, under experimental warming, arises because of the biomass method. We show the method they treat as independent yields the same result. We describe why the substrate-depletion hypothesis may not solely explain observed responses, and urge caution in interpretation of the seasonal data.
| 10342 | Mark A. Bradford, Jayna L. DeVore, John C. Maerz, Joseph V. McHugh, Cecil L. Smith, Michael S. Strickland | 2009 | Native, insect herbivore communities derive a significant proportion of their carbon from a widespread invader
of forest understories | Bradford, M.A., DeVore, J.L., Maerz, J.C., McHugh, J.V., Smith, C.L., Strickland, M.S. 2009. Native, insect herbivore communities derive a significant proportion of their carbon from a widespread invader of forest understories. Biol Invasions. | Journal Article | Research on natural enemies demonstrates the potential for exotic plants to be integrated into foodwebs through the activities of native herbivores. The quantitative importance of exotics as a food resource to herbivores is more difficult to ascertain. In addition, some widespread invaders appear to have minimal herbivore loads. Microstegium vimineum is one example.
| 10338 | Namil Chung and Keller Suberkropp | 2008 | Infl uence of shredder feeding and nutrients on fungal activity and community structure in headwater streams | Chung, N., Suberkropp, K. 2008. Infl uence of shredder feeding and nutrients on fungal activity and community structure in headwater streams. Fundamental and Applied Limnology, 173(1): 35-46. | Journal Article | In stream detrital food webs, interactions occur between aquatic hyphomycetes associated with decomposing leaves and shredders consuming those leaves. However, few studies have examined how the feeding activity of shredders affects aquatic hyphomycetes. We examined the effect of shredder feeding on aquatic hyphomycete communities associated with submerged leaves in two southern Appalachian headwater streams in Coweeta Hydrologic Laboratory, North Carolina, USA.
| 10337 | Rima Upchurch, Chih-Yu Chiu, Karin Everett, Glen Dyszynski, David C Coleman, William B Whitman | 2008 | Differences in the composition and diversity of bacterial communities from agricultural and forest soils | Upchurch, R., Chiu, C.Y., Everett, K., Dyszynski, G., Coleman, D.C., Whitman, W.B. 2008. Differences in the composition and diversity of bacterial communities from agricultural and forest soils. Soil Biology & Biochemistry, 40(6): 1294-1305. | Journal Article | Differences in the bacterial communities of soils caused by disturbances and land management were identified in rRNA gene libraries prepared from conventional tilled (CT) and no tilled (NT) cropland, a successional forest after 30 y of regrowth (NF) and an old forest of 465 y (OF) at Horseshoe Bend, in the southern Piedmont of Georgia (USA).
| 10336 | Qualls, Robert G., Akiko Takiyama, and Robert L. Wershaw | 2003 | Formation and Loss of Humic Substances During Decomposition in a Pine Forest Floor | Qualls, Robert G., Akiko Takiyama, and Robert L. Wershaw. 2003 Formation and Loss of Humic Substances During Decomposition in a Pine Forest Floor. Soil Science Society of America Journal. 67:899-909. | Jornal Article | Since twice as much C is sequestered in soils as is contained in the atmosphere, the factors controlling the decomposition rate of soil C are important to the assessment of the effects of climatic change. The formation of chemically resistant humic substances might be an important process controlling recycling of CO2 to the atmosphere. Our objectives were to measure the rate of formation and loss of humic substances during 13 yr of litter decomposition. We placed nets stances on the floor of a white pine (Pinus strobus) forest to separate each annual layer of litter for 13 yr and measured humic substance concentration using
| 10335 | J. E. DeHaven, D. J. Stouder, R. Ratajczak, T. J. Welch, G. D. Grossman | 1992 | Reproductive timing in three southern Appalachian stream fishes | DeHaven, J.E., Stouder, D.J., Ratajczak, R., Welch, T.J., Grossman, G.D. 1992. Reproductive timing in three southern Appalachian stream fishes. Ecology of Freshwater Fish, 1: 104-111 | Journal Article | We quantified the reproductive biology of mottled sculpin (Cottus bairdi), rosyside dace (Clinostomus funduloides) and longnose dace (Rhinichthus cataractae) in Coweeta Creek, North Carolina, USA, a fifth order stream. These species are abundant in coldwater streams through out the southern Appalachian mountains, the southernmost limit of their range. We collected fishes from Coweeta Creek every second month (between July 1984 and January 1986)
| 10334 | Douglas E. Facey and Gary D. Grossman | 1990 | The Metabolic Cost of Maintaining Position for Four North American Stream Fishes: Effects of Season and Velocity | Facey, D.E., Grossman, G.D. 1990. The Metabolic Cost of Maintaining Position for Four North American Stream Fishes: Effects of Season and Velocity. Physiological Zoology, 63(4): 757-776. | Journal Article | We used a swimming respirometer to measure oxygen consumption (i.e. metabolic cost) of four species of stream fishes while they held position at different velocities. We tested naturally acclimatized indivduals during during spring, summer, fall, and winter at seasonal temperatures and photoperiods. Rosyside dace (Clinostomus funduloides) longnose dace (Rhinichtys cataractae) cottled sculpin (Cottus bairdi) and juvenile rainbow trout (Oncorhynchus mykiss) all showed seasonal changes in oxygen consumption.
| 10333 | Gary D. Grossman and Vital Boulé | 1991 | Effects of Rosyside Dace (Clinostomus funduloides) on Microhabitat Use of Rainbow Trout (Oncorhynchus mykiss) | Boullé, V., Grossman, G.D. 1991. Effects of Rosyside Dace (Clinostomus funduloides) on Microhabitat Use of Rainbow Trout (Oncorhynchus mykiss). Canadian Journal of Fisheries and Aquatic Sciences, 48(7): 1235-1243. | Journal Article | We experimentally examined the effects of competition for space between rainbow trout (Oncorhynchus mykiss) and rosyside dace (Clinostomus funduloides) in an artificial stream. These species generally do not exhibit statistically significant differences in microhabitat use in Coweeta Creek, North Carolina, USA. Two competition (trout and dace) and two control (trout only) trials were conducted during spring and summer.
| 10332 | D.E. Facey and G.D. Grossman | 1992 | The relationship between water velocity, energetic costs, and microhabitat use in four North American stream fishes | Facey, D.E., Grossman, G.D. 1992. The relationship between water velocity, energetic costs, and microhabitat use in four North American stream fishes. Hydrobiologia, 239: 1-6 | Journal Article | We employed field and laboratory data to test the hypothesis that microhabitat use by rainbow trout (Oncorhynchus mykiss), rosyside dace (Clinostomus funduloides), longnose dace (Rhinichthys cataractae) and mottled sculpin (Cottus bairdi) was affected by energetic constraints. Both rainbow trout and rosyside dace occupied water-column microhabitats in Coweeta Creek, North Carolina, U.S.A
| 10331 | John T. Walker, James M. Vose, Jennifer Knoepp, Christopher D. Geron | 2009 | Recovery of Nitrogen Pools and Processes in Degraded Riparian Zones in the Southern Appalachians | Walker, J.T., Vose, J.M., Knoepp, J., Geron, C.D. 2009. Recovery of Nitrogen Pools and Processes in Degraded Riparian Zones in the Southern Appalachians. Journal Enviormental Quality, 38:1391-1399. | Journal Article | Establishment of riparian buff ers is an eff ective method for reducing nutrient input to streams. However, the underlying
biogeochemical processes are not fully understood. The objective of this 4-yr study was to examine the eff ects of riparian
zone restoration on soil N cycling mechanisms in a mountain pasture previously degraded by cattle.
| 10330 | Ami L. Riscassi and Todd M. Scanlon | 2009 | Nitrate variability in hydrological flow paths for three mid-Appalachian forested watersheds following a large-scale defoliation | Riscassi, A.L., Scanlon, T.M. 2009. Nitrate variability in hydrological flow paths for three mid-Appalachian forested watersheds following a large-scale defoliation. Journal of Geophysical Research, 114. | Journal Article | Nitrate (NO3) leakage from forested watersheds due to disturbance is a well documented but not well understood process that can contribute to the degradation of receiving waters through eutrophication. Several studies have shown that large-scale
defoliation and deforestation events in small forested watersheds in the eastern United States cause immediate and dramatic increases in NO3 flux to steams
| 10329 | Jason E. Nedlo, Timothy A. Martin, James M. Vose, Robert O. Teskey | 2009 | Growing season temperatures limit growth of loblolly pine (Pinus taeda L.) seedlings across a wide geographic transect | Nedlo, J.E., Martin, T.A., Vose, J.M., Teskey, R.O. 2009. Growing season temperatures limit growth of loblolly pine (Pinus taeda L.) seedlings across a wide geographic transect. Springer-Verlag | Journal Article | We grew potted loblolly pine (Pinus taeda L.) seedlings from a single provenance under well watered and fertilized conditions at four locations along a 610 km north–south transect that spanned most of the species range to examine how differences in the above-ground environment would affect growth rate, biomass partitioning and gas exchange characteristics.
| 10328 | Gary D. Grossman, David M. Nickerson, Mary C. Freeman | 1991 | Principal Component Analyses of Assemblage Structure Data: Utility of Tests Based on Eigenvalues | Grossman, G.D., Nickerson, D.M., Freeman, M.C. 1991. Principal Component Analyses of Assemblage Structure Data: Utility of Tests Based on Eigenvalues. Ecology, 72(1): 341-347. | Journal Article | We examined the ability of eigenvalue tests to distinguish field-collected from random, assemblage structure data sets. Eight published time series of species abun- dances were used in the analysis, including data sets for: fishes, birds, mammals, stream benthos, and crabs. To test the efficacy of eigenvalue tests, we constructed 1000 randomly generated data sets for each real data set, whose means and variances were identical to the means and variances of the original data matrices.
| 10327 | Kurt D. Fausch, Yoshinori Taniguchi, Shigeru Nakano, Gary D. Grossman, and Colin R. Townsend | 2001 | Flood Disturbance Regimes Influence Rainbow Trout Invasion Success Among Five Holarctic Regions | Fausch, K.D., Taniguchi, Y., Nakano, S. Grossman, G.D. Townsend, C.R. 2001.Flood Disturbance Regimes Influence Rainbow Trout Invasion Success Among Five Holarctic Regions. Ecological Applications, 11(5): 1438-1455 | Journal Article | There is growing awareness that predicting biological invasions will require the development of conceptual models for specific taxa at appropriate scales. Salmonids are ideal taxa for testing factors that influence invasions, because large numbers have been
introduced worldwide for long periods and their ecology is well known. We evaluated the hypothesis that, among regions with suitable water temperatures, environmental resistance from flood disturbances that wash away trout fry strongly influence invasion success of rainbow trout (Oncorhynchus mykiss), the most widely introduced fish species.
| 10326 | Gary D. Grossman, Mary C. Freeman, Peter B. Moyle and John O. Whitaker, Jr. | 1985 | Stochasticity and Assemblage Organization in an Indiana Stream Fish Assemblage | Grossman, G.D., Freeman, M.C., Moyle, P.B., Whitaker, J.O. 1985. Stochasticity and Assemblage Organization in an Indiana Stream Fish Assemblage.The American Naturalist, 126(3): 275-285. | Journal Article | In 1982, Grossman et al. purported to demonstate that a stream fish assemblage was probably affected by unpredictable environmental disturbances than by interactive processes such as competition. The main purpose of that paper was to interest ecologists in the possibility that stream fish and invertebrate assemlages may be organized through processes fundamentally different from those addressed by the bulk of ecological theory.
| 10325 | David M. Nickerson, Douglas E. Facey, Gary D. Grossman | 1989 | Estimating Physiological Tresholds with Continuous Two-Phase Regression | Nickerson, D.M., Facey, D.E., Grossman, G.D. 1989. Estimating Physiological Tresholds with Continuous Two-Phase Regression. Physiological Zoology, 62(4): 866-887. | Journal Article | Abrupt changes in the relationship between physiological responses and enviormental parameters yield data that frequently cannot be described with a single regression equation. Manyapproaches used to deal with this problem result in incomplete description of the data and imprecise approximations of the physiological threshold(s) at which the relationships changes.
| 10324 | Jennifer Hill and Gary D. Grossman | 1993 | An Energetic Model of Microhabitat Use for Rainbow Trout and Rosyside Dace | Grossman, G.D., Hill, J.H. 1993. An Energetic Model of Microhabitat Use for Rainbow Trout and Rosyside Dace. Ecology, 74(3): 685-698. | Journal Article | We constructed an energetic model to determine the optimal focal point current velocity (i.e., microhabitat) for rainbow trout (Oncorhynchus mykiss) and rosyside dace (Clinostomus funduloides) in Coweeta Creek, a fifth-order stream in North Carolina, USA. Energetic costs were evaluated by quantifying the metabolic expenditure associated with swimming at a given velocity. We estimated benefits by measuring potential energetic gains of feeding at a given velocity.
| 10323 | Amanda Carla Newman - University of Georgia | 2008 | Restoration of shortleaf pine (Pinus Echinata Mill) – Bluestem (Andropogon Gerardii Vitman and Schizachyrium Scoparium (Michx.) Nash) communities in the southern Appalachians | Newman, Amanda Carla. 2008. Restoration of shortleaf pine (Pinus Echinata Mill) – Bluestem (Andropogon Gerardii Vitman and Schizachyrium Scoparium (Michx.) Nash) communities in the southern Appalachians. Athens, GA: University of Georgia. 105 p. M.S. thesis. | Graduate Publication
(Master's Thesis) | Fire suppression and southern pine beetle (Dendroctonus frontalis Zimm.) outbreaks have contributed to the decline of native shortleaf pine (Pinus echinata Mill.) - bluestem grass (Andropogon gerardii Vitman and Schizachyrium scoparium (Michx.) Nash) communities in the southern Appalachians. We evaluated the effects of herbicide application (nursery) and selective felling and prescribed burning (field) on planted shortleaf pine seedling growth
| 10322 | April E. Nuckolls, Nina Wurzburger, Chelcy R. Ford, Ronald L. Hendrick, James M. Vose, and Brian D. Kloeppel | 2009 | Hemlock Declines Rapidly with Hemlock Woolly Adelgid Infestation: Impacts on the Carbon Cycle of Southern Appalachian Forests | Nuckolls, April E.; Wurzburger, Nina; Ford, Chelcy R.; Hendrick, Ronald L.; Vose, James M.; Kloeppel, Brian D. 2009. Hemlock declines rapidly with hemlock woolly adelgid infestation: impacts on the carbon cycle of southern Appalachian forests. Ecosystems. 12: 179-190. | Journal Article | The recent infestation of southern Appalachian eastern hemlock stands by hemlock woolly adelgid (HWA) is expected to have dramatic and lasting effects on forest structure and function. We studied the short-term changes to the carbon cycle in a mixed stand of hemlock and hardwoods, where hemlock was declining due to either girdling or HWA infestation.
| 10321 | Robert J. Warren II | 2008 | Mechanisms driving understory evergreen herb distributions across slope aspects: as derived from landscape
position | Warren, R.J. 2008. Mechanisms driving understory evergreen herb distributions across slope aspects: as derived from landscape
position. Plant Ecology. 198(2): 297-308. | Journal Article | In the Northern Hemisphere, the surface of south-facing slopes orients toward the sun and thus receives a greater duration and intensity of solar irradiation, resulting in a relatively warmer, drier microclimate and seasonal environmental extremes.This creates potentially detrimental conditions for evergreen plants which must endure the full gamut of conditions. I hypothesize that (1) increased southerly aspect will correlate negatively with evergreen understory plant distributions;
| 10320 | Nina Wurzburger and Ronald L. Hendrick | 2009 | Blackwell Publishing Ltd
Plant litter chemistry and mycorrhizal roots promote a nitrogen feedback in a temperate forest | Wurzburger, N., Hendrick, R.L. 2009. Mechanisms driving understory evergreen herb distributions across slope aspects: as derived from landscape position. Journal of Ecology | Jornal Article | 1. Relationships between mycorrhizal plants and soil nitrogen (N) have led to the speculation that the chemistry of plant litter and the saprotrophy of mycorrhizal symbionts can function together to closely couple the N cycle between plants and soils. We hypothesized that a tannin-rich, ericoid mycorrhizal (ERM) plant promotes the retention of protein–tannin N in soil, and that this N source is accessible to saprotrophic ERM symbionts and their hosts, but remains less available to co-occurring ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) symbionts and their hosts.
| 10319 | Michael S. Strickland, Ernest Osburn, Christian Lauber, Noah Fierer and Mark A. Bradford | 2009 | Litter quality is in the eye of the beholder: initial decomposition rates as a function of inoculum characteristics | Strickland, M.S., Osburn, E., Lauber, C., Fierer, N., Bradford, M.A. 2009. Litter quality is in the eye of the beholder: initial decomposition rates as a function of inoculum characteristics. Functional Ecology. | Journal Article | 1.The chemical composition of plant litter is commonly considered to indicate its quality as a resource for decomposer organisms. Litter quality, defined in this way, has been shown to be a major determinant of litter decomposition rates both within and across terrestrial ecosystems. Notably, the structure of the microbial community that is directly responsible for primary decomposition is
rarely considered as an empirical predictor of litter decay rates.
| 10318 | Michael S. Strickland, Christian Lauber, Noah Fierer, and Mark A. Bradford | 2009 | Testing the functional significance of microbial community composition | Strickland, M.S., Lauber C., Fierer, N, Bradford, M.A. 2009. Testing the functional significance of microbial community composition. Ecology, 90(2): 441-451. | Journal Article | A critical assumption underlying terrestrial ecosystem models is that soil microbial communities, when placed in a common environment, will function in an identical manner regardless of the composition of that community. Given high species diversity in
microbial communities and the ability of microbes to adapt rapidly to new conditions, this assumption of functional redundancy seems plausible.
| 10317 | K. A. Schofield, C. M. Pringle, J . L. Meyer and E. J . Rosi-Marshall | 2008 | Functional redundancy of stream macroconsumers despite differences in catchment land use | Schofield, K.A., Pringle, C.M., Meyer, J.L., Rosi-Marshall, E.J. 2008. Freshwater Biology, 53: 2587–2599 | Journal Article | 1. The conversion of forested landscapes to agriculture and, increasingly, to suburban and urban development significantly affects the structure and function of both terrestrial and aquatic ecosystems. While a growing body of research is examining how biotic communities change in response to human alteration of landscapes, less is known about how these changes in community structure affect biotic interactions.
| 10316 | H. Jochen Schenk, Susana Espino, Christine M. Goedhart, Marisa Nordenstahl, Hugo I. Martinez Cabrera,
and Cynthia S. Jones | 2008 | Hydraulic integration and shrub growth form linked across continental aridity gradients | Schenk, H.J. et al. 2008. Hydraulic integration and shrub growth form linked across continental aridity gradients. Proceedings of the National Academy of Sciences of the United States of America. 105(32): 11248-11253. | Journal Article | Both engineered hydraulic systems and plant hydraulic systems are protected against failure by resistance, reparability, and redundancy. A basic rule of reliability engineering is that the level of independent redundancy should increase with increasing risk of fatal system failure. Here we show that hydraulic systems of plants function as predicted by this engineering rule.
| 10315 | Robert J. Warren II - University of Georgia | 2007 | Linking Understory Evergreen Herbaceous Distributions and Niche Differentiation Using Habitat-Specific Demography and Experimental Common Gardens | Warren, R.J., II. 2007. Linking understory evergreen herbaceous distributions and niche differentiation using habitat-specific demography and experimental common gardens. Athens, GA: University of Georgia. 135 p. Ph. D. dissertation | Graduate Publication
(Dissertation) | The assumption that a 1:1 correspondence exists between a species’ distribution and “suitable habitat,” the ecological niche, is undermined by current theory – metapopulation, source/sink, dispersal limitation and remnant populations – and empirical evidence.
| 10313 | Quentin D. Read | 2008 | Soil and Tree Ring Chemistry Changes in An Oak Forest | Read, Quentin D. 2008. Soil and tree ring chemistry changes in an oak forest. Highlands Biological Station. 56-65 pp. | Other | Changes in soil chemistry due to historic large-scale disturbances, e.g. pollution inputs, storm damage, and logging, have
previously been shown to cause similar changes in the nutrient concentrations found in tree rings. Repeated soil sampling in a reference watershed at the Coweeta Hydrologic Laboratory (Otto, NC) in 1970, 1990, and 2004 showed significant decreases in cation concentrations and soil pH.
| 10312 | Catherine M. Pringle, and Scott L. Collins | 2004 | | Pringle, C.M., Collins, S.L. 2004. Needed: A Unified infrastructure to Support Long-Term Scientific Research on Public Lands. Ecological Applications, 14(1): 18-21 | Journal Article |
| 10311 | Joy M. O’Keefe, Susan C. Loeb, J. Drew Lanham, Hoke S. Hill Jr. | 2009 | Macrohabitat factors affect day roost selection by eastern red bats and eastern pipistrelles in the southern Appalachian Mountains, USA | O'Keefe, J.M., Loeb, S.C., Lanham, J.D. Hill, H.S. 2009. Macrohabitat factors affect day roost selection by eastern red bats and eastern pipistrelles in the southern Appalachian Mountains, USA. Forest Ecology and Management, 257: 2868-1763. | Journal Article | Although roost sites are critically important to bats,we have few data on macrohabitat factors that affect roost selection by foliage-roosting bats. Such data are needed so that forest managers can make informed decisions regarding conservation of bat roosts. Our objective was to examine roost selection by nonreproductive eastern pipistrelles (Perimyotis subflavus) and red bats (Lasiurus borealis) in a dense deciduous forest undergoing low-intensity timbermanagement in the southern Appalachian Mountains
of western North Carolina, USA.
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