Mary Freeman, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 110
Drought responses of freshwater mussels (Unionidae) in coastal plain tributaries of the Flint River basin, Georgia
During extreme drought conditions, mussel survival and habitat conditions were monitored weekly at nine locations representing a gradient in stream size in the lower Flint River basin, Georgia, USA. Cumulative unionid mortality ranged from 13 to 93% among sites, and was associated with low flow velocity (below 0.01 m/s) and dissolved oxygen concentrations below 5 mg/L. Species...
Authors
P.M. Gagnon, S.W. Golladay, W.K. Michener, Mary C. Freeman
Geomorphology and fish assemblages in a Piedmont river basin, U.S.A.
1. We investigated linkages between fishes and fluvial geomorphology in 31 wadeable streams in the Etowah River basin in northern Georgia, U.S.A. Streams were stratified into three catchment sizes of approximately 15, 50 and 100 km2, and fishes and geomorphology were sampled at the reach scale (i.e. 20–40 times stream width).2. Non-metric multidimensional scaling (NMDS) identified 85% of...
Authors
D.M. Walters, D.S. Leigh, Mary C. Freeman, B. J. Freeman, C. M. Pringle
Effects of pulsed, high-velocity water flow on larval robust redhorse and V-lip redhorse
The pulsed, high-velocity water flow characteristic of water-flow patterns downstream from hydropower-generating dams has been implicated in the declining abundance of both aquatic insects and fishes in dam-regulated rivers. This study examined the effects of 0, 4, and 12 h per day of pulsed, high-velocity water flow on the egg mortality, hatch length, final length, and survival of...
Authors
R.S. Weyers, Cecil A. Jennings, Mary C. Freeman
Ecosystem-level consequences of migratory faunal depletion caused by dams
Humans have been damming rivers for millennia, and our more ambitious efforts over the past century have arguably altered river ecosystems more extensively than any other anthropogenic activity. Effects of damming on river biota include decimation of migratory fauna (e.g., diadromous and potamodromous fishes and crustaceans), lost fisheries, and imperilment of obligate riverine taxa...
Authors
Mary C. Freeman, C. M. Pringle, E.A. Greathouse, B. J. Freeman
Proposal for adaptive management to conserve biotic integrity in a regulated segment of the Tallapoosa River, Alabama, U.S.A
Conserving river biota will require innovative approaches that foster and utilize scientific understanding of ecosystem responses to alternative river-management scenarios. We describe ecological and societal issues involved in flow management of a section of the Tallapoosa River (Alabama, U.S.A.) in which a species-rich native fauna is adversely affected by flow alteration by an...
Authors
Elise R. Irwin, Mary C. Freeman
Overview of land cover and geomorphic indicators of biotic integrity in the Etowah River basin, GA
No abstract available.
Authors
D.S. Leigh, Mary C. Freeman, B. J. Freeman, E.A. Kramer, C. M. Pringle, A.D. Rosemond, M.J. Paul, D.M. Walters, A. Roy, C.P. Lo
Flow and habitat effects on juvenile fish abundance in natural and altered flow regimes
Conserving biological resources native to large river systems increasingly depends on how flow-regulated segments of these rivers are managed. Improving management will require a better understanding of linkages between river biota and temporal variability of flow and instream habitat. However, few studies have quantified responses of native fish populations to multiyear (>2 yr) patterns...
Authors
Mary C. Freeman, Z.H. Bowen, K.D. Bovee, E.R. Irwin
Bed texture and turbidity as indicators of fish biotic integrity in the Etowah River system
No abstract available.
Authors
D.M. Walters, Mary C. Freeman, D.S. Leigh, B. J. Freeman, M.J. Paul, C. M. Pringle
Stream loss and fragmentation due to impoundments in the upper Oconee watershed
No abstract available.
Authors
M.D. Merrill, Mary C. Freeman, B. J. Freeman, E.A. Kramer, L.M. Hartle
Ecological considerations for reservoir planning in north Georgia
No abstract available.
Authors
Mary C. Freeman, M.D. Merrill, B. J. Freeman
Regional effects of hydrologic alterations on riverine macrobiota in the New World: Tropical-temperate comparisons
This article has two main objectives: to examine what is known about regional effects of hydrologic modifications in temperate and tropical areas of the New World (i.e., North and South America and the Caribbean), with an emphasis on fishes and molluscs; and to discuss research needs regarding regional effects of hydrologic alterations in temperate and tropical regions. A better...
Authors
C. M. Pringle, Mary C. Freeman, B. J. Freeman
Habitat use by juvenile channel catfish and flathead catfish in lotic systems in Alabama
No abstract available.
Authors
E.R. Irwin, Mary C. Freeman, K.M. Costley
Science and Products
Filter Total Items: 110
Drought responses of freshwater mussels (Unionidae) in coastal plain tributaries of the Flint River basin, Georgia
During extreme drought conditions, mussel survival and habitat conditions were monitored weekly at nine locations representing a gradient in stream size in the lower Flint River basin, Georgia, USA. Cumulative unionid mortality ranged from 13 to 93% among sites, and was associated with low flow velocity (below 0.01 m/s) and dissolved oxygen concentrations below 5 mg/L. Species...
Authors
P.M. Gagnon, S.W. Golladay, W.K. Michener, Mary C. Freeman
Geomorphology and fish assemblages in a Piedmont river basin, U.S.A.
1. We investigated linkages between fishes and fluvial geomorphology in 31 wadeable streams in the Etowah River basin in northern Georgia, U.S.A. Streams were stratified into three catchment sizes of approximately 15, 50 and 100 km2, and fishes and geomorphology were sampled at the reach scale (i.e. 20–40 times stream width).2. Non-metric multidimensional scaling (NMDS) identified 85% of...
Authors
D.M. Walters, D.S. Leigh, Mary C. Freeman, B. J. Freeman, C. M. Pringle
Effects of pulsed, high-velocity water flow on larval robust redhorse and V-lip redhorse
The pulsed, high-velocity water flow characteristic of water-flow patterns downstream from hydropower-generating dams has been implicated in the declining abundance of both aquatic insects and fishes in dam-regulated rivers. This study examined the effects of 0, 4, and 12 h per day of pulsed, high-velocity water flow on the egg mortality, hatch length, final length, and survival of...
Authors
R.S. Weyers, Cecil A. Jennings, Mary C. Freeman
Ecosystem-level consequences of migratory faunal depletion caused by dams
Humans have been damming rivers for millennia, and our more ambitious efforts over the past century have arguably altered river ecosystems more extensively than any other anthropogenic activity. Effects of damming on river biota include decimation of migratory fauna (e.g., diadromous and potamodromous fishes and crustaceans), lost fisheries, and imperilment of obligate riverine taxa...
Authors
Mary C. Freeman, C. M. Pringle, E.A. Greathouse, B. J. Freeman
Proposal for adaptive management to conserve biotic integrity in a regulated segment of the Tallapoosa River, Alabama, U.S.A
Conserving river biota will require innovative approaches that foster and utilize scientific understanding of ecosystem responses to alternative river-management scenarios. We describe ecological and societal issues involved in flow management of a section of the Tallapoosa River (Alabama, U.S.A.) in which a species-rich native fauna is adversely affected by flow alteration by an...
Authors
Elise R. Irwin, Mary C. Freeman
Overview of land cover and geomorphic indicators of biotic integrity in the Etowah River basin, GA
No abstract available.
Authors
D.S. Leigh, Mary C. Freeman, B. J. Freeman, E.A. Kramer, C. M. Pringle, A.D. Rosemond, M.J. Paul, D.M. Walters, A. Roy, C.P. Lo
Flow and habitat effects on juvenile fish abundance in natural and altered flow regimes
Conserving biological resources native to large river systems increasingly depends on how flow-regulated segments of these rivers are managed. Improving management will require a better understanding of linkages between river biota and temporal variability of flow and instream habitat. However, few studies have quantified responses of native fish populations to multiyear (>2 yr) patterns...
Authors
Mary C. Freeman, Z.H. Bowen, K.D. Bovee, E.R. Irwin
Bed texture and turbidity as indicators of fish biotic integrity in the Etowah River system
No abstract available.
Authors
D.M. Walters, Mary C. Freeman, D.S. Leigh, B. J. Freeman, M.J. Paul, C. M. Pringle
Stream loss and fragmentation due to impoundments in the upper Oconee watershed
No abstract available.
Authors
M.D. Merrill, Mary C. Freeman, B. J. Freeman, E.A. Kramer, L.M. Hartle
Ecological considerations for reservoir planning in north Georgia
No abstract available.
Authors
Mary C. Freeman, M.D. Merrill, B. J. Freeman
Regional effects of hydrologic alterations on riverine macrobiota in the New World: Tropical-temperate comparisons
This article has two main objectives: to examine what is known about regional effects of hydrologic modifications in temperate and tropical areas of the New World (i.e., North and South America and the Caribbean), with an emphasis on fishes and molluscs; and to discuss research needs regarding regional effects of hydrologic alterations in temperate and tropical regions. A better...
Authors
C. M. Pringle, Mary C. Freeman, B. J. Freeman
Habitat use by juvenile channel catfish and flathead catfish in lotic systems in Alabama
No abstract available.
Authors
E.R. Irwin, Mary C. Freeman, K.M. Costley