Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 166
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
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
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
Biomonitoring environmental contamination with pipping black-crowned night heron embryos: Induction of cytochrome P450 Biomonitoring environmental contamination with pipping black-crowned night heron embryos: Induction of cytochrome P450
Cytochrome P450-associated monooxygenase activities and cytochrome P450 proteins were measured in pipping black-crowned night heron (Nycticorax nycticorax) embryos collected from a reference site (next to the 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...
Authors
Barnett A. Rattner, M. J. Melancon, T. W. Custer, R. L. Hothem, Kirk A. King, L. J. LeCaptain, J. W. Spann, Bruce R. Woodin, John J. Stegeman
Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas
Our objectives were to measure concentrations of seven trace elements and 14 organochlorine compounds in sediment and biota of the shoalgrass (Halodule wrightii) community of the lower Laguna Madre of south Texas and to determine whether chemicals associated with agriculture (e.g. mercury, arsenic, selenium, organochlorine pesticides) were highest near agricultural drainages. Arsenic...
Authors
T. W. Custer, C. A. Mitchell
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus) (n = 523) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum12 km). The mean direction of landing sites differed seasonally for fights from Spider...
Authors
T. W. Custer, C. Bunck
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus ) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum 12 km). The mean direction of landing sites differed seasonally for flights from Spider Island...
Authors
T. W. Custer, C. Bunck
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Floatation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax ), Snowy Egrets (Egretta thula ) and Great Egrets (Casmerodius albus ) were evaluated as methods to determine date of hatching. Although specific gravity was a better predictor of hatching date than egg flotation, both techniques were imprecise. The regression between specific...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Flotation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax), Snowy Egrets (Egretta thula) and Great Egrets (Casmerodius albus) were evaluated as methods to determine date of hatching. Length of incubation and duration of hatching period were also documented for each species. Although species gravity was a better predictor of hatching date...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas
Behavior of redheads (Aythya americana) during winter was studied on the hypersaline lower Laguna Madre and adjacent freshwater to brackish water ponds of southern Texas. On Laguna Madre, feeding (46%) and sleeping (37%) were the most common behaviors. Redheads fed more during early morning (64%) than during the rest of the day (40%); feeding activity was negatively correlated with...
Authors
C. A. Mitchell, T. W. Custer, P.J. Zwank
Science and Products
Filter Total Items: 166
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
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
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
Biomonitoring environmental contamination with pipping black-crowned night heron embryos: Induction of cytochrome P450 Biomonitoring environmental contamination with pipping black-crowned night heron embryos: Induction of cytochrome P450
Cytochrome P450-associated monooxygenase activities and cytochrome P450 proteins were measured in pipping black-crowned night heron (Nycticorax nycticorax) embryos collected from a reference site (next to the 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...
Authors
Barnett A. Rattner, M. J. Melancon, T. W. Custer, R. L. Hothem, Kirk A. King, L. J. LeCaptain, J. W. Spann, Bruce R. Woodin, John J. Stegeman
Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas
Our objectives were to measure concentrations of seven trace elements and 14 organochlorine compounds in sediment and biota of the shoalgrass (Halodule wrightii) community of the lower Laguna Madre of south Texas and to determine whether chemicals associated with agriculture (e.g. mercury, arsenic, selenium, organochlorine pesticides) were highest near agricultural drainages. Arsenic...
Authors
T. W. Custer, C. A. Mitchell
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus) (n = 523) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum12 km). The mean direction of landing sites differed seasonally for fights from Spider...
Authors
T. W. Custer, C. Bunck
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus ) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum 12 km). The mean direction of landing sites differed seasonally for flights from Spider Island...
Authors
T. W. Custer, C. Bunck
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Floatation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax ), Snowy Egrets (Egretta thula ) and Great Egrets (Casmerodius albus ) were evaluated as methods to determine date of hatching. Although specific gravity was a better predictor of hatching date than egg flotation, both techniques were imprecise. The regression between specific...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Flotation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax), Snowy Egrets (Egretta thula) and Great Egrets (Casmerodius albus) were evaluated as methods to determine date of hatching. Length of incubation and duration of hatching period were also documented for each species. Although species gravity was a better predictor of hatching date...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas
Behavior of redheads (Aythya americana) during winter was studied on the hypersaline lower Laguna Madre and adjacent freshwater to brackish water ponds of southern Texas. On Laguna Madre, feeding (46%) and sleeping (37%) were the most common behaviors. Redheads fed more during early morning (64%) than during the rest of the day (40%); feeding activity was negatively correlated with...
Authors
C. A. Mitchell, T. W. Custer, P.J. Zwank