Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 167
Energy budget and prey requirements of breeding lapland longspurs Calcarius lapponicus near Barrow Alaska, U.S.A. Energy budget and prey requirements of breeding lapland longspurs Calcarius lapponicus near Barrow Alaska, U.S.A.
Breeding Lapland longspurs, Calcarius lapponicus, near Barrow, Alaska, have relatively constant energy demands throughout the summer; the average estimated daily energy budgets (DEBs) were 132 and 118 kJ for the male and female. Thermoregulation accounted consistently for one-quarter to one-third of the total DEB. Flight in the male and incubation in the female were major components of...
Authors
T. W. Custer, R. G. Osborn, F.A. Pitelka, J.A. Gessaman
Hatching success of Caspian terns nesting in the lower Laguna Madre, Texas, USA Hatching success of Caspian terns nesting in the lower Laguna Madre, Texas, USA
The average clutch size of Caspian Terns nesting in a colony in the Lower Laguna Madre near Laguna Vista, Texas, USA in 1984 was 1.9 eggs per nest. Using the Mayfield method for calculating success, one egg hatched in 84.1% of the nests and 69.8% of the eggs laid hatched. These hatching estimates are as high or higher than estimates from colonies in other areas.
Authors
C. A. Mitchell, T. W. Custer
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
Science and Products
Filter Total Items: 167
Energy budget and prey requirements of breeding lapland longspurs Calcarius lapponicus near Barrow Alaska, U.S.A. Energy budget and prey requirements of breeding lapland longspurs Calcarius lapponicus near Barrow Alaska, U.S.A.
Breeding Lapland longspurs, Calcarius lapponicus, near Barrow, Alaska, have relatively constant energy demands throughout the summer; the average estimated daily energy budgets (DEBs) were 132 and 118 kJ for the male and female. Thermoregulation accounted consistently for one-quarter to one-third of the total DEB. Flight in the male and incubation in the female were major components of...
Authors
T. W. Custer, R. G. Osborn, F.A. Pitelka, J.A. Gessaman
Hatching success of Caspian terns nesting in the lower Laguna Madre, Texas, USA Hatching success of Caspian terns nesting in the lower Laguna Madre, Texas, USA
The average clutch size of Caspian Terns nesting in a colony in the Lower Laguna Madre near Laguna Vista, Texas, USA in 1984 was 1.9 eggs per nest. Using the Mayfield method for calculating success, one egg hatched in 84.1% of the nests and 69.8% of the eggs laid hatched. These hatching estimates are as high or higher than estimates from colonies in other areas.
Authors
C. A. Mitchell, T. W. Custer
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