Mary Freeman, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 110
The ecological limits of hydrologic alteration (ELOHA): A new framework for developing regional environmental flow standards The ecological limits of hydrologic alteration (ELOHA): A new framework for developing regional environmental flow standards
The flow regime is a primary determinant of the structure and function of aquatic and riparian ecosystems for streams and rivers. Hydrologic alteration has impaired riverine ecosystems on a global scale, and the pace and intensity of human development greatly exceeds the ability of scientists to assess the effects on a river-by-river basis. Current scientific understanding of hydrologic...
Authors
N.L. Poff, B. D. Richter, A.H. Arthington, S.E. Bunn, R.J. Naiman, E. Kendy, M. Acreman, C. Apse, B.P. Bledsoe, Mary C. Freeman, J. Henriksen, R. B. Jacobson, J.G. Kennen, D.M. Merritt, J. H. O’Keeffe, J. D. Olden, K. Rogers, R.E. Tharme, A. Warner
Methods for assessing the conservation value of rivers Methods for assessing the conservation value of rivers
No abstract available.
Authors
P.J. Boon, Mary C. Freeman
Application of a multistate model to estimate culvert effects on movement of small fishes Application of a multistate model to estimate culvert effects on movement of small fishes
While it is widely acknowledged that culverted road-stream crossings may impede fish passage, effects of culverts on movement of nongame and small-bodied fishes have not been extensively studied and studies generally have not accounted for spatial variation in capture probabilities. We estimated probabilities for upstream and downstream movement of small (30-120 mm standard length)...
Authors
J.R. Norman, M.M. Hagler, Mary C. Freeman, B. J. Freeman
A method to assess longitudinal riverine connectivity in tropical streams dominated by migratory biota A method to assess longitudinal riverine connectivity in tropical streams dominated by migratory biota
1. One way in which dams affect ecosystem function is by altering the distribution and abundance of aquatic species. 2. Previous studies indicate that migratory shrimps have significant effects on ecosystem processes in Puerto Rican streams, but are vulnerable to impediments to upstream or downstream passage, such as dams and associated water intakes where stream water is withdrawn for...
Authors
K.E. Crook, C. M. Pringle, Mary C. Freeman
Stream fish occurrence in response to impervious cover, historic land use, and hydrogeomorphic factors Stream fish occurrence in response to impervious cover, historic land use, and hydrogeomorphic factors
We evaluated competing models explaining the occurrence of five stream fishes in an urbanizing watershed to determine the relative importance of (a) impervious surface and other indicators of current land use, (b) historic land use (e.g., agriculture, impoundments), and (c) hydrogeomorphic characteristics (e.g., stream size, elevation, geology). For four of five species, the best...
Authors
Seth J. Wenger, James Peterson, Mary C. Freeman, Byron J. Freeman, D. David Homans
Quantifying the extent of river fragmentation by hydropower dams in the Sarapiquí River Basin, Costa Rica Quantifying the extent of river fragmentation by hydropower dams in the Sarapiquí River Basin, Costa Rica
Costa Rica has recently experienced a rapid proliferation of dams for hydropower on rivers draining its northern Caribbean slope. In the Sarapiquí River Basin, eight hydropower plants were built between 1990 and 1999 and more projects are either under construction or proposed. The majority of these dams are small (
Authors
Elizabeth P. Anderson, Catherine M. Pringle, Mary C. Freeman
Science and Products
Filter Total Items: 110
The ecological limits of hydrologic alteration (ELOHA): A new framework for developing regional environmental flow standards The ecological limits of hydrologic alteration (ELOHA): A new framework for developing regional environmental flow standards
The flow regime is a primary determinant of the structure and function of aquatic and riparian ecosystems for streams and rivers. Hydrologic alteration has impaired riverine ecosystems on a global scale, and the pace and intensity of human development greatly exceeds the ability of scientists to assess the effects on a river-by-river basis. Current scientific understanding of hydrologic...
Authors
N.L. Poff, B. D. Richter, A.H. Arthington, S.E. Bunn, R.J. Naiman, E. Kendy, M. Acreman, C. Apse, B.P. Bledsoe, Mary C. Freeman, J. Henriksen, R. B. Jacobson, J.G. Kennen, D.M. Merritt, J. H. O’Keeffe, J. D. Olden, K. Rogers, R.E. Tharme, A. Warner
Methods for assessing the conservation value of rivers Methods for assessing the conservation value of rivers
No abstract available.
Authors
P.J. Boon, Mary C. Freeman
Application of a multistate model to estimate culvert effects on movement of small fishes Application of a multistate model to estimate culvert effects on movement of small fishes
While it is widely acknowledged that culverted road-stream crossings may impede fish passage, effects of culverts on movement of nongame and small-bodied fishes have not been extensively studied and studies generally have not accounted for spatial variation in capture probabilities. We estimated probabilities for upstream and downstream movement of small (30-120 mm standard length)...
Authors
J.R. Norman, M.M. Hagler, Mary C. Freeman, B. J. Freeman
A method to assess longitudinal riverine connectivity in tropical streams dominated by migratory biota A method to assess longitudinal riverine connectivity in tropical streams dominated by migratory biota
1. One way in which dams affect ecosystem function is by altering the distribution and abundance of aquatic species. 2. Previous studies indicate that migratory shrimps have significant effects on ecosystem processes in Puerto Rican streams, but are vulnerable to impediments to upstream or downstream passage, such as dams and associated water intakes where stream water is withdrawn for...
Authors
K.E. Crook, C. M. Pringle, Mary C. Freeman
Stream fish occurrence in response to impervious cover, historic land use, and hydrogeomorphic factors Stream fish occurrence in response to impervious cover, historic land use, and hydrogeomorphic factors
We evaluated competing models explaining the occurrence of five stream fishes in an urbanizing watershed to determine the relative importance of (a) impervious surface and other indicators of current land use, (b) historic land use (e.g., agriculture, impoundments), and (c) hydrogeomorphic characteristics (e.g., stream size, elevation, geology). For four of five species, the best...
Authors
Seth J. Wenger, James Peterson, Mary C. Freeman, Byron J. Freeman, D. David Homans
Quantifying the extent of river fragmentation by hydropower dams in the Sarapiquí River Basin, Costa Rica Quantifying the extent of river fragmentation by hydropower dams in the Sarapiquí River Basin, Costa Rica
Costa Rica has recently experienced a rapid proliferation of dams for hydropower on rivers draining its northern Caribbean slope. In the Sarapiquí River Basin, eight hydropower plants were built between 1990 and 1999 and more projects are either under construction or proposed. The majority of these dams are small (
Authors
Elizabeth P. Anderson, Catherine M. Pringle, Mary C. Freeman