Mary Freeman, Ph.D. (Former Employee)
Science and Products
Southeast Regional Assessment Project (SERAP): Assessing Global Change Impacts on Natural and Human Systems in the Southeast
The Southeastern United States spans a broad range of physiographic settings and maintains exceptionally high levels of faunal diversity. Unfortunately, many of these ecosystems are increasingly under threat due to rapid human development, and management agencies are increasingly aware of the potential effects that climate change will have on these ecosystems. Natural resource managers...
USGS-USFS Partnership to Help Managers Evaluate Conservation Strategies for Aquatic Ecosystems Based on Future Climate Projections
The Southeastern U.S. spans broad ranges of physiographic settings and contains a wide variety of aquatic systems that provide habitat for hundreds of endemic aquatic species that pose interesting challenges and opportunities for managers of aquatic resources, particularly in the face of climate change. For example, the Southeast contains the southernmost populations of the eastern brook...
Filter Total Items: 110
Cryptic tolerant fish species and their potential effect on index of biotic integrity (IBI) scores Cryptic tolerant fish species and their potential effect on index of biotic integrity (IBI) scores
Indices such as the Index of Biotic Integrity (IBI) are often used by management agencies to estimate the abstract property of stream health. These indices are usually predicated on the belief that certain fish species are tolerant to environmental perturbation while others are sensitive. Species are usually designated as either tolerant or sensitive in these analyses based on inherent...
Authors
Bryson G. Hilburn, Mary Freeman, Katelyn M. Lawson, Steven J. Rider, Carol E. Johnston
Observed and projected functional reorganization of riverine fish assemblages from global change Observed and projected functional reorganization of riverine fish assemblages from global change
Climate and land-use/land-cover change (‘global change’) are restructuring biodiversity, globally. Broadly, environmental conditions are expected to become warmer, potentially drier (particularly in arid regions), and more anthropogenically developed in the future, with spatiotemporally complex effects on ecological communities. We used functional traits to inform Chesapeake Bay...
Authors
Taylor Woods, Mary Freeman, Kevin P. Krause, Kelly O. Maloney
Stream restoration produces transitory, not permanent, changes to fish assemblages at compensatory mitigation sites Stream restoration produces transitory, not permanent, changes to fish assemblages at compensatory mitigation sites
There is inconsistent evidence that stream restoration projects lead to recovery of ecosystem attributes, especially stream biota. While some assessments have documented desired changes in fish community metrics in the first years following restoration, longer-term studies have not always corroborated these findings. In this study, we used data and monitoring reports submitted to federal
Authors
Edward S. Stowe, Kelly N. Petersen, Shishir Rao, Eric J. Walther, Mary Freeman, Seth J. Wenger
Habitat associations of riverine fishes among rocky shoals Habitat associations of riverine fishes among rocky shoals
Understanding species' associations with physical habitat conditions is a fundamental goal of ecology. For organisms that occupy lotic ecosystems, relationships to streamflow are of particular importance, but these associations are unstudied for most species. We tested the predictability of fish–microhabitat relationships in river shoals (shallow, rocky areas with relatively swift water...
Authors
Anna Y. Baynes, Mary Freeman, S. Kyle McKay, Seth J. Wenger
Seasonal variability in macroinvertebrate assemblages in paired perennial and intermittent streams in Costa Rica Seasonal variability in macroinvertebrate assemblages in paired perennial and intermittent streams in Costa Rica
Ecological effects of flooding and drying events are relatively understudied in the Neotropics and less is known about these hydrological extremes in intermittent streams. Neotropical headwater streams in Costa Rica provide opportunities to evaluate the response of macroinvertebrate communities to seasonal changes in flow regime in relatively human undisturbed systems. We quantified the...
Authors
Darixa D Hernandez-Abrams, Scott Connelly, Mary Freeman, Pablo E. Gutierrez-Fonseca, Seth J. Wenger
Simple statistical models can be sufficient for testing hypotheses with population time series data Simple statistical models can be sufficient for testing hypotheses with population time series data
Time-series data offer wide-ranging opportunities to test hypotheses about the physical and biological factors that influence species abundances. Although sophisticated models have been developed and applied to analyze abundance time series, they require information about species detectability that is often unavailable. We propose that in many cases, simpler models are adequate for...
Authors
Seth J. Wenger, Edward S. Stowe, Keith B. Gido, Mary Freeman, Yoichiro Kanno, Nathan R. Franssen, Julian Olden, N. LeRoy Poff, Annika W. Walters, Phillip M. Bumpers, Meryl C. Mims, Mevin B. Hooten, Xinyi Lu
Science and Products
Southeast Regional Assessment Project (SERAP): Assessing Global Change Impacts on Natural and Human Systems in the Southeast
The Southeastern United States spans a broad range of physiographic settings and maintains exceptionally high levels of faunal diversity. Unfortunately, many of these ecosystems are increasingly under threat due to rapid human development, and management agencies are increasingly aware of the potential effects that climate change will have on these ecosystems. Natural resource managers...
USGS-USFS Partnership to Help Managers Evaluate Conservation Strategies for Aquatic Ecosystems Based on Future Climate Projections
The Southeastern U.S. spans broad ranges of physiographic settings and contains a wide variety of aquatic systems that provide habitat for hundreds of endemic aquatic species that pose interesting challenges and opportunities for managers of aquatic resources, particularly in the face of climate change. For example, the Southeast contains the southernmost populations of the eastern brook...
Filter Total Items: 110
Cryptic tolerant fish species and their potential effect on index of biotic integrity (IBI) scores Cryptic tolerant fish species and their potential effect on index of biotic integrity (IBI) scores
Indices such as the Index of Biotic Integrity (IBI) are often used by management agencies to estimate the abstract property of stream health. These indices are usually predicated on the belief that certain fish species are tolerant to environmental perturbation while others are sensitive. Species are usually designated as either tolerant or sensitive in these analyses based on inherent...
Authors
Bryson G. Hilburn, Mary Freeman, Katelyn M. Lawson, Steven J. Rider, Carol E. Johnston
Observed and projected functional reorganization of riverine fish assemblages from global change Observed and projected functional reorganization of riverine fish assemblages from global change
Climate and land-use/land-cover change (‘global change’) are restructuring biodiversity, globally. Broadly, environmental conditions are expected to become warmer, potentially drier (particularly in arid regions), and more anthropogenically developed in the future, with spatiotemporally complex effects on ecological communities. We used functional traits to inform Chesapeake Bay...
Authors
Taylor Woods, Mary Freeman, Kevin P. Krause, Kelly O. Maloney
Stream restoration produces transitory, not permanent, changes to fish assemblages at compensatory mitigation sites Stream restoration produces transitory, not permanent, changes to fish assemblages at compensatory mitigation sites
There is inconsistent evidence that stream restoration projects lead to recovery of ecosystem attributes, especially stream biota. While some assessments have documented desired changes in fish community metrics in the first years following restoration, longer-term studies have not always corroborated these findings. In this study, we used data and monitoring reports submitted to federal
Authors
Edward S. Stowe, Kelly N. Petersen, Shishir Rao, Eric J. Walther, Mary Freeman, Seth J. Wenger
Habitat associations of riverine fishes among rocky shoals Habitat associations of riverine fishes among rocky shoals
Understanding species' associations with physical habitat conditions is a fundamental goal of ecology. For organisms that occupy lotic ecosystems, relationships to streamflow are of particular importance, but these associations are unstudied for most species. We tested the predictability of fish–microhabitat relationships in river shoals (shallow, rocky areas with relatively swift water...
Authors
Anna Y. Baynes, Mary Freeman, S. Kyle McKay, Seth J. Wenger
Seasonal variability in macroinvertebrate assemblages in paired perennial and intermittent streams in Costa Rica Seasonal variability in macroinvertebrate assemblages in paired perennial and intermittent streams in Costa Rica
Ecological effects of flooding and drying events are relatively understudied in the Neotropics and less is known about these hydrological extremes in intermittent streams. Neotropical headwater streams in Costa Rica provide opportunities to evaluate the response of macroinvertebrate communities to seasonal changes in flow regime in relatively human undisturbed systems. We quantified the...
Authors
Darixa D Hernandez-Abrams, Scott Connelly, Mary Freeman, Pablo E. Gutierrez-Fonseca, Seth J. Wenger
Simple statistical models can be sufficient for testing hypotheses with population time series data Simple statistical models can be sufficient for testing hypotheses with population time series data
Time-series data offer wide-ranging opportunities to test hypotheses about the physical and biological factors that influence species abundances. Although sophisticated models have been developed and applied to analyze abundance time series, they require information about species detectability that is often unavailable. We propose that in many cases, simpler models are adequate for...
Authors
Seth J. Wenger, Edward S. Stowe, Keith B. Gido, Mary Freeman, Yoichiro Kanno, Nathan R. Franssen, Julian Olden, N. LeRoy Poff, Annika W. Walters, Phillip M. Bumpers, Meryl C. Mims, Mevin B. Hooten, Xinyi Lu