Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 166
Reproductive success and heavy metal contamination in Rhode Island common terns Reproductive success and heavy metal contamination in Rhode Island common terns
Common tern cIutch size, reproductive success and growth of young recorded from an abandoned barge on the Providence River, an area of heavy metal contamination, were equal to, or greater than, .from less contaminated areas. Concentrations of copper and zinc were higher in livers of nestling terns from the Providence River than from other, less contaminated, areas. However...
Authors
T. W. Custer, J. C. Franson, John F. Moore, J.E. Myers
Organochlorine concentrations in prefledging common terns at three Rhode Island colonies Organochlorine concentrations in prefledging common terns at three Rhode Island colonies
Concentrations of DDE, polychlorinated biphenyls (PCBs), and polychlorinated diphenyl ethers (PCDPEs) in carcasses of prefledging Common Terns (Sterna hirundo) at three Rhode Island colonies support the hypothesis that local contamination is responsible for among-colony differences observed in eggs in an earlier study. The highest concentrations of DDE and PCBs (mean = 0.24 and 2.8 ppm...
Authors
T. W. Custer, C.M. Bunck, C. J. Stafford
Effects on wildlife of ethyl and methyl parathion applied to California rice fields Effects on wildlife of ethyl and methyl parathion applied to California rice fields
Selected rice fields on the Sacramento National Wildlife Refuge Complex were aerially sprayed one time during May or June 1982 with either ethyl (0.11 kg Al/ha) or methyl (0.84 kg AI/ha) parathion for control of tadpole shrimp, Triops longicaudatus. No sick or dead vertebrate wildlife were found or adjacent to the treated rice fields after spraying. Specimens of the following birds and...
Authors
Thomas W. Custer, Elwood F. Hill, Harry M. Ohlendorf
Reproduction and organochlorine contaminants in terns at San Diego Bay Reproduction and organochlorine contaminants in terns at San Diego Bay
In 1981, we studied Caspian Terns (Sterna caspia) and Elegant Terns (S. elegans) nesting at the south end of San Diego Bay, California. Randomly collected Caspian Tern eggs contained signficantly (P 0.05) higher mean concentrations of DDE (9.30 ppm) than did Elegant Tern eggs (3.79 ppm). DDE may have had an adverse effect on Caspian Tern reproduction but the relationship between hatching...
Authors
H. M. Ohlendorf, F.C. Schaffner, T. W. Custer, C. J. Stafford
Effects of wildlife of ethyl and methyl parathion applied to California USA rice fields Effects of wildlife of ethyl and methyl parathion applied to California USA rice fields
Selected rice fields on the Sacramento National Wildlife Refuge Complex were aerially sprayed one time during May or June 1982 with either ethyl (0.11 kg Al/ha) or methyl (0.84 kg AI/ha) parathion for control of tadpole shrimp, Triops longicaudatus. No sick or dead vertebrate wildlife were found or adjacent to the treated rice fields after spraying. Specimens of the following birds and...
Authors
T. W. Custer, E. F. Hill, H. M. Ohlendorf
Organochlorine concentrations in prefledging common terns Sterna hirundo at three Rhode Island USA colonies Organochlorine concentrations in prefledging common terns Sterna hirundo at three Rhode Island USA colonies
Concentrations of DDE, polychlorinated biphenyls (PCBs), and polychlorinated diphenyl ethers (PCDPEs) in carcasses of prefledging Common Terns (Sterna hirundo) at three Rhode Island colonies support the hypothesis that local contamination is responsible for among-colony differences observed in eggs in an earlier study. The highest concentrations of DDE and PCBs (mean=0.24 and 2.8 ppm wet...
Authors
T. W. Custer, C.M. Bunck, C.L. Stafford
Occurrence and timing of second clutches in common terns Occurrence and timing of second clutches in common terns
Eighteen pairs of Common Terns (Sterna hirundo) at three different colonies laid second clutches while still feeding young from their first broods. Seven clutches were laid before the chicks from the first brood fledged, and 11 were laid after the chicks from the first brood fledged. In each case, parents alternately fed chicks from the first brood and incubated the second clutch...
Authors
D.A. Wiggins, R.D. Morris, I.C.T. Nisbet, T. W. Custer
Tissue lead distribution and hematologic effects in American kestrels (Falco sparverius) fed biologically incorporated lead Tissue lead distribution and hematologic effects in American kestrels (Falco sparverius) fed biologically incorporated lead
American kestrels were fed a diet containing 0.5, 120, 212, and 448 ppm (dry wt) biologically incorporated lead (Pb) for 60 days. The diet consisted of homogenized 4-wk-old cockerels raised on feed mixed with and without lead. No kestrels died and weights did not differ among treatment groups. The control group (0.5 ppm Pb) had the lowest mean concentration of lead and the high dietary...
Authors
T. W. Custer, J. C. Franson, O. H. Pattee
Organochlorine residues and shell characteristics of roseate tern eggs, 1981 Organochlorine residues and shell characteristics of roseate tern eggs, 1981
Roseate Terns (Sterna dougallii) breed in two areas in the Western Hemisphere: in northeastern North America between Long Island, New York, and Nova Scotia, and around the Caribbean Sea from the Florida Keys and the Bahamas to the Netherlands Lesser Antilles (Bent 1921, Bond 1956, Nisbet 1980). Both populations are small, and concern recently has been expressed about their status (Nisbet...
Authors
T. W. Custer, I.C.T. Nisbet, A. J. Krynitsky
Clutch size, reproductive success, and organochlorine contaminants in Atlantic coast black-crowned night-herons Clutch size, reproductive success, and organochlorine contaminants in Atlantic coast black-crowned night-herons
In 1979, we gathered clutch-size and reproductive-success data on Black-crowned Night-Herons (Nycticorax nycticorax) nesting in three New England and two North Carolina colonies. In 1975, we gathered similar data from one of the New England and one of the North Carolina colonies. Latitudinal differences in clutch initiation were not evident. Mean clutch size was larger in the New England...
Authors
Thomas W. Custer, Gary L. Hensler, T. Earl Kaiser
Heavy metal residues in prefledgling black-crowned night-herons from three Atlantic coast colonies Heavy metal residues in prefledgling black-crowned night-herons from three Atlantic coast colonies
Aquatic birds may serve as indicators of regional metal contamination. Because the food of prefledgling herons (Nycticorax nycticorax ) comes only from areas near the colony, their tissues should reflect local metal contamination. The authors' hypothesis was that prefledgling herons from the Rhode Island colony should have higher concentrations of metals than do those from either the...
Authors
T. W. Custer, B.L. Mulhern
Organochlorine residues in Atlantic coast black-crowned night-heron eggs, 1979 Organochlorine residues in Atlantic coast black-crowned night-heron eggs, 1979
Eggs of Black-crowned Night-Herons (Nycticorax nycticorax) were collected in 1979 from two colonies in North Carolina, two colonies in Rhode Island, and one colony in Massachusetts. Mean concentrations of DDE and PCBs were higher in the New England samples than in those from North Carolina, Mean concentrations of organochlorine contaminants in addled eggs collccted at two New England...
Authors
T. W. Custer, C.M. Bunck, T. E. Kaiser
Science and Products
Filter Total Items: 166
Reproductive success and heavy metal contamination in Rhode Island common terns Reproductive success and heavy metal contamination in Rhode Island common terns
Common tern cIutch size, reproductive success and growth of young recorded from an abandoned barge on the Providence River, an area of heavy metal contamination, were equal to, or greater than, .from less contaminated areas. Concentrations of copper and zinc were higher in livers of nestling terns from the Providence River than from other, less contaminated, areas. However...
Authors
T. W. Custer, J. C. Franson, John F. Moore, J.E. Myers
Organochlorine concentrations in prefledging common terns at three Rhode Island colonies Organochlorine concentrations in prefledging common terns at three Rhode Island colonies
Concentrations of DDE, polychlorinated biphenyls (PCBs), and polychlorinated diphenyl ethers (PCDPEs) in carcasses of prefledging Common Terns (Sterna hirundo) at three Rhode Island colonies support the hypothesis that local contamination is responsible for among-colony differences observed in eggs in an earlier study. The highest concentrations of DDE and PCBs (mean = 0.24 and 2.8 ppm...
Authors
T. W. Custer, C.M. Bunck, C. J. Stafford
Effects on wildlife of ethyl and methyl parathion applied to California rice fields Effects on wildlife of ethyl and methyl parathion applied to California rice fields
Selected rice fields on the Sacramento National Wildlife Refuge Complex were aerially sprayed one time during May or June 1982 with either ethyl (0.11 kg Al/ha) or methyl (0.84 kg AI/ha) parathion for control of tadpole shrimp, Triops longicaudatus. No sick or dead vertebrate wildlife were found or adjacent to the treated rice fields after spraying. Specimens of the following birds and...
Authors
Thomas W. Custer, Elwood F. Hill, Harry M. Ohlendorf
Reproduction and organochlorine contaminants in terns at San Diego Bay Reproduction and organochlorine contaminants in terns at San Diego Bay
In 1981, we studied Caspian Terns (Sterna caspia) and Elegant Terns (S. elegans) nesting at the south end of San Diego Bay, California. Randomly collected Caspian Tern eggs contained signficantly (P 0.05) higher mean concentrations of DDE (9.30 ppm) than did Elegant Tern eggs (3.79 ppm). DDE may have had an adverse effect on Caspian Tern reproduction but the relationship between hatching...
Authors
H. M. Ohlendorf, F.C. Schaffner, T. W. Custer, C. J. Stafford
Effects of wildlife of ethyl and methyl parathion applied to California USA rice fields Effects of wildlife of ethyl and methyl parathion applied to California USA rice fields
Selected rice fields on the Sacramento National Wildlife Refuge Complex were aerially sprayed one time during May or June 1982 with either ethyl (0.11 kg Al/ha) or methyl (0.84 kg AI/ha) parathion for control of tadpole shrimp, Triops longicaudatus. No sick or dead vertebrate wildlife were found or adjacent to the treated rice fields after spraying. Specimens of the following birds and...
Authors
T. W. Custer, E. F. Hill, H. M. Ohlendorf
Organochlorine concentrations in prefledging common terns Sterna hirundo at three Rhode Island USA colonies Organochlorine concentrations in prefledging common terns Sterna hirundo at three Rhode Island USA colonies
Concentrations of DDE, polychlorinated biphenyls (PCBs), and polychlorinated diphenyl ethers (PCDPEs) in carcasses of prefledging Common Terns (Sterna hirundo) at three Rhode Island colonies support the hypothesis that local contamination is responsible for among-colony differences observed in eggs in an earlier study. The highest concentrations of DDE and PCBs (mean=0.24 and 2.8 ppm wet...
Authors
T. W. Custer, C.M. Bunck, C.L. Stafford
Occurrence and timing of second clutches in common terns Occurrence and timing of second clutches in common terns
Eighteen pairs of Common Terns (Sterna hirundo) at three different colonies laid second clutches while still feeding young from their first broods. Seven clutches were laid before the chicks from the first brood fledged, and 11 were laid after the chicks from the first brood fledged. In each case, parents alternately fed chicks from the first brood and incubated the second clutch...
Authors
D.A. Wiggins, R.D. Morris, I.C.T. Nisbet, T. W. Custer
Tissue lead distribution and hematologic effects in American kestrels (Falco sparverius) fed biologically incorporated lead Tissue lead distribution and hematologic effects in American kestrels (Falco sparverius) fed biologically incorporated lead
American kestrels were fed a diet containing 0.5, 120, 212, and 448 ppm (dry wt) biologically incorporated lead (Pb) for 60 days. The diet consisted of homogenized 4-wk-old cockerels raised on feed mixed with and without lead. No kestrels died and weights did not differ among treatment groups. The control group (0.5 ppm Pb) had the lowest mean concentration of lead and the high dietary...
Authors
T. W. Custer, J. C. Franson, O. H. Pattee
Organochlorine residues and shell characteristics of roseate tern eggs, 1981 Organochlorine residues and shell characteristics of roseate tern eggs, 1981
Roseate Terns (Sterna dougallii) breed in two areas in the Western Hemisphere: in northeastern North America between Long Island, New York, and Nova Scotia, and around the Caribbean Sea from the Florida Keys and the Bahamas to the Netherlands Lesser Antilles (Bent 1921, Bond 1956, Nisbet 1980). Both populations are small, and concern recently has been expressed about their status (Nisbet...
Authors
T. W. Custer, I.C.T. Nisbet, A. J. Krynitsky
Clutch size, reproductive success, and organochlorine contaminants in Atlantic coast black-crowned night-herons Clutch size, reproductive success, and organochlorine contaminants in Atlantic coast black-crowned night-herons
In 1979, we gathered clutch-size and reproductive-success data on Black-crowned Night-Herons (Nycticorax nycticorax) nesting in three New England and two North Carolina colonies. In 1975, we gathered similar data from one of the New England and one of the North Carolina colonies. Latitudinal differences in clutch initiation were not evident. Mean clutch size was larger in the New England...
Authors
Thomas W. Custer, Gary L. Hensler, T. Earl Kaiser
Heavy metal residues in prefledgling black-crowned night-herons from three Atlantic coast colonies Heavy metal residues in prefledgling black-crowned night-herons from three Atlantic coast colonies
Aquatic birds may serve as indicators of regional metal contamination. Because the food of prefledgling herons (Nycticorax nycticorax ) comes only from areas near the colony, their tissues should reflect local metal contamination. The authors' hypothesis was that prefledgling herons from the Rhode Island colony should have higher concentrations of metals than do those from either the...
Authors
T. W. Custer, B.L. Mulhern
Organochlorine residues in Atlantic coast black-crowned night-heron eggs, 1979 Organochlorine residues in Atlantic coast black-crowned night-heron eggs, 1979
Eggs of Black-crowned Night-Herons (Nycticorax nycticorax) were collected in 1979 from two colonies in North Carolina, two colonies in Rhode Island, and one colony in Massachusetts. Mean concentrations of DDE and PCBs were higher in the New England samples than in those from North Carolina, Mean concentrations of organochlorine contaminants in addled eggs collccted at two New England...
Authors
T. W. Custer, C.M. Bunck, T. E. Kaiser