Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 167
Environmental contaminants in redheads wintering in coastal Louisiana and Texas Environmental contaminants in redheads wintering in coastal Louisiana and Texas
Whole body and liver analyses indicated that wintering redheads (Aythya americana; n = 70) in coastal Louisiana (one site) and Texas (two sites) were relatively free of contamination with common trace elements, organochlorines, and hydrocarbons. Most trace elements, including As, Cr, Hg, Mg, Mn, Ni, Pb, Se, Sr, and Zn, were within background concentrations in livers; levels of B, Cd, Cu...
Authors
T.C. Michot, T. W. Custer, A.J. Nault, C. A. Mitchell
Trace elements in canvasbacks (Aythya valisineria) wintering in Louisiana, USA, 1987-1988 Trace elements in canvasbacks (Aythya valisineria) wintering in Louisiana, USA, 1987-1988
We determined trace element concentrations in livers of canvasbacks (Aythya valisineria) collected at Catahoula Lake and the Mississippi River Delta, Louisiana during, the winter of 1987–1988. Forty percent of canvasbacks wintering at Lake Catahoula had elevated concentrations of lead (>6·7 μg g−1 dry weight) in the liver; 33% had concentrations consistent with lead intoxication (>26·7...
Authors
Thomas W. Custer, William L. Hohman
Prevalence of eustrongylidosis in wading birds from colonies in California, Texas, and Rhode Island, USA Prevalence of eustrongylidosis in wading birds from colonies in California, Texas, and Rhode Island, USA
Snowy Egret (Egretta thula) and Black-crowned Night-Heron (Nycticorax nycticorax) nestlings from colonies in Texas, Rhode Island, and California and Great Egret (Casmerodius albus) nestlings from Texas were examined for eustrongylidosis, or infection by the parasitic nematode Eustrongylides spp. In 31% (24/77) of all broods examined, at least one nestling was infected. Snowy Egret broods...
Authors
J. C. Franson, T. W. Custer
Reproductive success of barn swallows nesting near a selenium-contaminated lake in east Texas, USA Reproductive success of barn swallows nesting near a selenium-contaminated lake in east Texas, USA
Reproductive success and contaminant levels in 1986 and 1987 were compared between Barn Swallows nesting at selenium-contaminated Martin Lake, Texas, USA, and swallows nesting at a reference site. Nests were initiated about the same time or earlier at Martin Lake than at the reference site and clutch size was similar between the two locations. Nest success was significantly higher at...
Authors
Kirk A. King, T. W. Custer, D.A. Weaver
Relation among cytochrome P450, AH-active PCB congeners and dioxin equivalents in pipping black-crowned night-heron embryos Relation among cytochrome P450, AH-active PCB congeners and dioxin equivalents in pipping black-crowned night-heron embryos
Pipping black-crowned night-heron (Nycticorax nycticorax) embryos were collected from a relatively uncontaminated site (next to Chincoteague National Wildlife Refuge, VA) and three polluted sites (Cat Island, Green Bay, Lake Michigan, WI; Bair Island, San Francisco Bay, CA; West Marin Island, San Francisco Bay, CA). Hepatic cytochrome P-450-associated monooxygenases and cytochrome P-450...
Authors
Barnett A. Rattner, Jeff S. Hatfield, M. J. Melancon, T. W. Custer, D. E. Tillitt
Herbivory on shoalgrass by wintering redheads in Texas Herbivory on shoalgrass by wintering redheads in Texas
An estimated 80% of redheads (Aythya americana) winter on the Laguna Madre of south Texas and Mexico and feed almost exclusively on shoalgrass (Halodule wrightii) rhizomes. Shoalgrass abundance has decreased by 60% over the past 30 years, and because the effects of shoalgrass loss on wintering redheads are unknown, we initiated a study to define habitat selection criteria and document...
Authors
Christine A. Mitchell, Thomas W. Custer, Phillip J. Zwank
Science and Products
Filter Total Items: 167
Environmental contaminants in redheads wintering in coastal Louisiana and Texas Environmental contaminants in redheads wintering in coastal Louisiana and Texas
Whole body and liver analyses indicated that wintering redheads (Aythya americana; n = 70) in coastal Louisiana (one site) and Texas (two sites) were relatively free of contamination with common trace elements, organochlorines, and hydrocarbons. Most trace elements, including As, Cr, Hg, Mg, Mn, Ni, Pb, Se, Sr, and Zn, were within background concentrations in livers; levels of B, Cd, Cu...
Authors
T.C. Michot, T. W. Custer, A.J. Nault, C. A. Mitchell
Trace elements in canvasbacks (Aythya valisineria) wintering in Louisiana, USA, 1987-1988 Trace elements in canvasbacks (Aythya valisineria) wintering in Louisiana, USA, 1987-1988
We determined trace element concentrations in livers of canvasbacks (Aythya valisineria) collected at Catahoula Lake and the Mississippi River Delta, Louisiana during, the winter of 1987–1988. Forty percent of canvasbacks wintering at Lake Catahoula had elevated concentrations of lead (>6·7 μg g−1 dry weight) in the liver; 33% had concentrations consistent with lead intoxication (>26·7...
Authors
Thomas W. Custer, William L. Hohman
Prevalence of eustrongylidosis in wading birds from colonies in California, Texas, and Rhode Island, USA Prevalence of eustrongylidosis in wading birds from colonies in California, Texas, and Rhode Island, USA
Snowy Egret (Egretta thula) and Black-crowned Night-Heron (Nycticorax nycticorax) nestlings from colonies in Texas, Rhode Island, and California and Great Egret (Casmerodius albus) nestlings from Texas were examined for eustrongylidosis, or infection by the parasitic nematode Eustrongylides spp. In 31% (24/77) of all broods examined, at least one nestling was infected. Snowy Egret broods...
Authors
J. C. Franson, T. W. Custer
Reproductive success of barn swallows nesting near a selenium-contaminated lake in east Texas, USA Reproductive success of barn swallows nesting near a selenium-contaminated lake in east Texas, USA
Reproductive success and contaminant levels in 1986 and 1987 were compared between Barn Swallows nesting at selenium-contaminated Martin Lake, Texas, USA, and swallows nesting at a reference site. Nests were initiated about the same time or earlier at Martin Lake than at the reference site and clutch size was similar between the two locations. Nest success was significantly higher at...
Authors
Kirk A. King, T. W. Custer, D.A. Weaver
Relation among cytochrome P450, AH-active PCB congeners and dioxin equivalents in pipping black-crowned night-heron embryos Relation among cytochrome P450, AH-active PCB congeners and dioxin equivalents in pipping black-crowned night-heron embryos
Pipping black-crowned night-heron (Nycticorax nycticorax) embryos were collected from a relatively uncontaminated site (next to Chincoteague National Wildlife Refuge, VA) and three polluted sites (Cat Island, Green Bay, Lake Michigan, WI; Bair Island, San Francisco Bay, CA; West Marin Island, San Francisco Bay, CA). Hepatic cytochrome P-450-associated monooxygenases and cytochrome P-450...
Authors
Barnett A. Rattner, Jeff S. Hatfield, M. J. Melancon, T. W. Custer, D. E. Tillitt
Herbivory on shoalgrass by wintering redheads in Texas Herbivory on shoalgrass by wintering redheads in Texas
An estimated 80% of redheads (Aythya americana) winter on the Laguna Madre of south Texas and Mexico and feed almost exclusively on shoalgrass (Halodule wrightii) rhizomes. Shoalgrass abundance has decreased by 60% over the past 30 years, and because the effects of shoalgrass loss on wintering redheads are unknown, we initiated a study to define habitat selection criteria and document...
Authors
Christine A. Mitchell, Thomas W. Custer, Phillip J. Zwank