Mary Freeman, Ph.D.
Mary Freeman is a research ecologist with the Eastern Ecological Science Center at Athens, GA.
She received a B.S. in biology (1979), a M.S. in entomology (1982) and a Ph.D. in forest resources (1990) from the University of Georgia. Before joining Patuxent, Mary conducted research for the U.S. Fish and Wildlife Service and the National Biological Service in Auburn, AL (1992-1996). Mary serves as affiliate faculty at the Odum School of Ecology, University of Georgia, and on the graduate faculties at the University of Georgia and Auburn University.
Science and Products
Filter Total Items: 108
Sampling effort and estimates of species richness based on prepositioned area electrofisher samples
Estimates of species richness based on electrofishing data are commonly used to describe the structure of fish communities. One electrofishing method for sampling riverine fishes that has become popular in the last decade is the prepositioned area electrofisher (PAE). We investigated the relationship between sampling effort and fish species richness at seven sites in the Tallapoosa River system,
Authors
Z.H. Bowen, Mary C. Freeman
Evaluation of generalized habitat criteria for assessing impacts of altered flow regimes on warmwater fishes
Assessing potential effects of flow regulation on southeastern warmwater fish assemblages is problematic because of high species richness and our poor knowledge of habitat requirements for most species. A previous attempt to reduce the complexity of describing habitat requirements for diverse assemblages defined five 'key habitat' types based on quantitative descriptions of depth, velocity, subst
Authors
Z.H. Bowen, Mary C. Freeman, K.D. Bovee
Transferability of habitat suitability criteria for fishes in warmwater streams
We developed habitat suitability criteria and tested their transferability for nine fishes inhabiting unregulated Piedmont and Coastal Plain streams in Alabama. Criteria for optimal habitat were defined as those ranges of depth, velocity, substrate type, and cover type for which a species' suitability index (proportional abundance divided by proportional habitat availability, scaled from 0 to I) e
Authors
Mary C. Freeman, Zachary H. Bowen, Johnie H. Crance
Riverine resources: water needs and environmental effects analyses in the Alabama- Coosa- Tallapoosa and Apalachicola- Chattahoochee- Flint River basins
No abstract available.
Authors
Mary C. Freeman, J.M. Nestler, P.N. Johnson
Index of biotic integrity applied to a flow-regulated river system
No abstract available.
Authors
Z.H. Bowen, Mary C. Freeman, D.L. Watson
Movements by two small fishes in a large stream
Movements by adult Percina nigrojasciata and juvenile Lepomis auritus were examined in a large Coastal Plain stream in the southeastern United States. I marked fishes with subcutaneous injections of acrylic paints to indicate capture location within a 550-m long study site. Recaptures over an 18-month period primarily occurred within 33m of the original capture location, suggesting long-term resid
Authors
Mary C. Freeman
Habitat use by an endangered riverine fish and implications for species protection
We investigated habitat specificity of the amber darter (Percina antesella Williams & Etnier 1977), an imperiled fish from restricted portions of 2 rivers in the southeastern United States. Foraging amber darters occupied a narrow range of riffle habitat, consistently avoiding areas < 20 cm deep and with velocity < 10 cm. s−1 near the substrate, occupying areas with cobble or gravel substrate and
Authors
B. J. Freeman, Mary C. Freeman
Habitat use by an endangered riverine fish and implications for species protection
We investigated habitat specificity of the amber darter (Percina antesella Williams & Etnier 1977), an imperiled fish from restricted portions of 2 rivers in the southeastern United States. Foraging amber darters occupied a narrow range of riffle habitat, consistently avoiding areas < 20 cm deep and with velocity < 10 cm. s−1 near the substrate, occupying areas with cobble or gravel substrate and
Authors
B. J. Freeman, Mary Freeman
Evaluating impacts of stream flow alteration on warmwater fishes
No abstract available.
Authors
Mary C. Freeman, J.H. Crance
Effects of habitat availability on dispersion of a stream cyprinid
We analyzed temporal changes in the dispersion of the rosyside dace,Clinostomus funduloides, (family Cyprinidae) in a headwater stream, to assess the role of habitat availability in promoting fish aggregation. The dace foraged alone and in groups of up to about 25 individuals, and dispersion varied significantly among monthly censuses conducted from May through December. In two of three study pool
Authors
Mary C. Freeman, Gary D. Grossman
A field test for competitive interactions among foraging stream fishes
No abstract available.
Authors
Mary C. Freeman, G.D. Grossman
Group foraging by a stream minnow: shoals or aggregations?
The importance of social attraction in the formation of foraging groups was examined for a stream-dwelling cyprinid, the rosyside dace, Clinostomus funduloides. Dace arrivals and departures at natural foraging sites were monitored and tested for (1) tendency of dace to travel in groups, and (2) dependency of arrival and departure rates on group size. Dace usually entered and departed foraging si
Authors
Mary C. Freeman, G.D. Grossman
Science and Products
Filter Total Items: 108
Sampling effort and estimates of species richness based on prepositioned area electrofisher samples
Estimates of species richness based on electrofishing data are commonly used to describe the structure of fish communities. One electrofishing method for sampling riverine fishes that has become popular in the last decade is the prepositioned area electrofisher (PAE). We investigated the relationship between sampling effort and fish species richness at seven sites in the Tallapoosa River system,
Authors
Z.H. Bowen, Mary C. Freeman
Evaluation of generalized habitat criteria for assessing impacts of altered flow regimes on warmwater fishes
Assessing potential effects of flow regulation on southeastern warmwater fish assemblages is problematic because of high species richness and our poor knowledge of habitat requirements for most species. A previous attempt to reduce the complexity of describing habitat requirements for diverse assemblages defined five 'key habitat' types based on quantitative descriptions of depth, velocity, subst
Authors
Z.H. Bowen, Mary C. Freeman, K.D. Bovee
Transferability of habitat suitability criteria for fishes in warmwater streams
We developed habitat suitability criteria and tested their transferability for nine fishes inhabiting unregulated Piedmont and Coastal Plain streams in Alabama. Criteria for optimal habitat were defined as those ranges of depth, velocity, substrate type, and cover type for which a species' suitability index (proportional abundance divided by proportional habitat availability, scaled from 0 to I) e
Authors
Mary C. Freeman, Zachary H. Bowen, Johnie H. Crance
Riverine resources: water needs and environmental effects analyses in the Alabama- Coosa- Tallapoosa and Apalachicola- Chattahoochee- Flint River basins
No abstract available.
Authors
Mary C. Freeman, J.M. Nestler, P.N. Johnson
Index of biotic integrity applied to a flow-regulated river system
No abstract available.
Authors
Z.H. Bowen, Mary C. Freeman, D.L. Watson
Movements by two small fishes in a large stream
Movements by adult Percina nigrojasciata and juvenile Lepomis auritus were examined in a large Coastal Plain stream in the southeastern United States. I marked fishes with subcutaneous injections of acrylic paints to indicate capture location within a 550-m long study site. Recaptures over an 18-month period primarily occurred within 33m of the original capture location, suggesting long-term resid
Authors
Mary C. Freeman
Habitat use by an endangered riverine fish and implications for species protection
We investigated habitat specificity of the amber darter (Percina antesella Williams & Etnier 1977), an imperiled fish from restricted portions of 2 rivers in the southeastern United States. Foraging amber darters occupied a narrow range of riffle habitat, consistently avoiding areas < 20 cm deep and with velocity < 10 cm. s−1 near the substrate, occupying areas with cobble or gravel substrate and
Authors
B. J. Freeman, Mary C. Freeman
Habitat use by an endangered riverine fish and implications for species protection
We investigated habitat specificity of the amber darter (Percina antesella Williams & Etnier 1977), an imperiled fish from restricted portions of 2 rivers in the southeastern United States. Foraging amber darters occupied a narrow range of riffle habitat, consistently avoiding areas < 20 cm deep and with velocity < 10 cm. s−1 near the substrate, occupying areas with cobble or gravel substrate and
Authors
B. J. Freeman, Mary Freeman
Evaluating impacts of stream flow alteration on warmwater fishes
No abstract available.
Authors
Mary C. Freeman, J.H. Crance
Effects of habitat availability on dispersion of a stream cyprinid
We analyzed temporal changes in the dispersion of the rosyside dace,Clinostomus funduloides, (family Cyprinidae) in a headwater stream, to assess the role of habitat availability in promoting fish aggregation. The dace foraged alone and in groups of up to about 25 individuals, and dispersion varied significantly among monthly censuses conducted from May through December. In two of three study pool
Authors
Mary C. Freeman, Gary D. Grossman
A field test for competitive interactions among foraging stream fishes
No abstract available.
Authors
Mary C. Freeman, G.D. Grossman
Group foraging by a stream minnow: shoals or aggregations?
The importance of social attraction in the formation of foraging groups was examined for a stream-dwelling cyprinid, the rosyside dace, Clinostomus funduloides. Dace arrivals and departures at natural foraging sites were monitored and tested for (1) tendency of dace to travel in groups, and (2) dependency of arrival and departure rates on group size. Dace usually entered and departed foraging si
Authors
Mary C. Freeman, G.D. Grossman