Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 166
Organochlorine residues in common tern eggs from nine Atlantic coast colonies, 1980 Organochlorine residues in common tern eggs from nine Atlantic coast colonies, 1980
In 1980, 178 Common Tern (Sterna hirundo) eggs were collected in nine colonies from Rhode Island to North Carolina and were analyzed for organochlorines. DDE and PCBs were detected in most of the eggs. Mean concentrations of DDE and PCBs differed among colonies and seemed related to local contamination. Concentrations of DDE and PCBs in Common Tern eggs were well below those reported to...
Authors
T. W. Custer, R.M. Erwin, C. Stafford
Nesting by one-year-old black-crowned night herons on Hope Island, Rhode Island Nesting by one-year-old black-crowned night herons on Hope Island, Rhode Island
There have been few consistent reports concerning the frequency and success of nesting attempts by immature night herons of the genus Nycticorax. One- year-old Black-crowned Night Herons (Nycticorax nycticorax) mated to 2-yr-old or older birds built nests and incubated eggs in the wild (Gross 1923). In a captive colony, many 1-yr-old pairs of night herons courted and built nests, and one...
Authors
Thomas W. Custer, William E. Davis
Toxicity of dietary lead in young cockerels Toxicity of dietary lead in young cockerels
Day-old cockerels received 1850 ppm dietary lead for 4 wks. Blood delta-aminolevulinic acid dehydratase (ALAD) activity was reduced to 1.6% of control activity by the end of the study. Hemoglobin concentration (Hb) in lead-exposed cockerels was significantly less than that of controls at 7, 14, and 28 days, and packed cell volume (PCV) was significantly reduced at 14 days. Blood lead...
Authors
J. Christian Franson, Thomas W. Custer
Estimating reproductive success in colonial waterbirds: An evaluation Estimating reproductive success in colonial waterbirds: An evaluation
To estimate reproductive success in a population one ideally would like to determine the number of young fledged per nesting female. However, this is difficult because often (1) the adults are not individually marked, (2) the colony is not visited daily, and (3) the investigator is unable to monitor all young until they fledge. If adults are unmarked and successful renesting occurs...
Authors
R.M. Erwin, T. W. Custer
Common tern colonies along the mid-Atlantic coast. I. Nestling chronology Common tern colonies along the mid-Atlantic coast. I. Nestling chronology
1. Sixteen Common Tern colonies in Rhode Island, New Jersey, Virginia, and North Carolina were studied from May through July 1980 by four investigators. Nests were marked during egg laying and were monitored every 5-7 days until fledging of young. 2. Results from 1980 indicate that ambient temperature differences in the four study areas account for differences in the onset of egg laying...
Authors
D. C. Smith, R.M. Erwin, T. W. Custer, J.O. Fussell
Atlas of gull and tern colonies: North Carolina to Key West, Florida Atlas of gull and tern colonies: North Carolina to Key West, Florida
No abstract available.
Authors
John W. Portnoy, R. Michael Erwin, Thomas W. Custer
Distribution, species abundance, and nesting-site use of Atlantic coast colonies of herons and their allies Distribution, species abundance, and nesting-site use of Atlantic coast colonies of herons and their allies
In 1975 and 1976, eight teams of investigators located 262 colonies of nesting herons and their allies along the Atlantic coast from Florida to Maine. Fourteen species were found in Florida, numbers decreasing to seven in Maine. Colonies censused in the extreme south and north of the study area were lower in number of species and number of adults than those in the intermediate area. More...
Authors
Thomas W. Custer, Ronald G. Osborn, W.F. Stout
Nest site and colony characteristics of wading birds in selected Atlantic Coast colonies Nest site and colony characteristics of wading birds in selected Atlantic Coast colonies
Nests of 5 species of wading birds were identified and marked during the breeding season at 6 locations from Massachusetts to North Carolina. At the end of the breeding season 12 characteristics of nest-site location were measured. Nest locations were mapped to examine dispersion and nearest neighbor relationships. Multivariate analyses were used to describe and compare sites and species...
Authors
Donald L. Beaver, Ronald G. Osborn, Thomas W. Custer
Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254 Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254
A dietary dosage of 25 ppm Aroclor 1254 fed to nine-month-old mallards Anas platyrhynchos for at least a month before egg-laying had no detrimental effect on reproductive success or nest attentiveness when hens were allowed to incubate their own eggs. The treatment caused no effect on number of hens laying, date of first egg laid or clutch size. Fertility of eggs was greater among...
Authors
T. W. Custer, G. H. Heinz
New black-crowned night heron colony found in Rhode Island New black-crowned night heron colony found in Rhode Island
No abstract available.
Authors
T. W. Custer, J.E. Myers, C.C. Allin
Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254 Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254
A dietary dosage of 25 ppm Aroclor 1254 fed to nine-month-old mallards Anas platyrhynchos for at least a month before egg-laying had no detrimental effect on reproductive success or nest attentiveness when hens were allowed to incubate their own eggs. The treatment caused no effect on number of hens laying, date of first egg laid or clutch size. Fertility of eggs was greater among...
Authors
T. W. Custer, G. H. Heinz
Response of captive, breeding mallards to oiled water Response of captive, breeding mallards to oiled water
No abstract available.
Authors
T. W. Custer, P.H. Albers
Science and Products
Filter Total Items: 166
Organochlorine residues in common tern eggs from nine Atlantic coast colonies, 1980 Organochlorine residues in common tern eggs from nine Atlantic coast colonies, 1980
In 1980, 178 Common Tern (Sterna hirundo) eggs were collected in nine colonies from Rhode Island to North Carolina and were analyzed for organochlorines. DDE and PCBs were detected in most of the eggs. Mean concentrations of DDE and PCBs differed among colonies and seemed related to local contamination. Concentrations of DDE and PCBs in Common Tern eggs were well below those reported to...
Authors
T. W. Custer, R.M. Erwin, C. Stafford
Nesting by one-year-old black-crowned night herons on Hope Island, Rhode Island Nesting by one-year-old black-crowned night herons on Hope Island, Rhode Island
There have been few consistent reports concerning the frequency and success of nesting attempts by immature night herons of the genus Nycticorax. One- year-old Black-crowned Night Herons (Nycticorax nycticorax) mated to 2-yr-old or older birds built nests and incubated eggs in the wild (Gross 1923). In a captive colony, many 1-yr-old pairs of night herons courted and built nests, and one...
Authors
Thomas W. Custer, William E. Davis
Toxicity of dietary lead in young cockerels Toxicity of dietary lead in young cockerels
Day-old cockerels received 1850 ppm dietary lead for 4 wks. Blood delta-aminolevulinic acid dehydratase (ALAD) activity was reduced to 1.6% of control activity by the end of the study. Hemoglobin concentration (Hb) in lead-exposed cockerels was significantly less than that of controls at 7, 14, and 28 days, and packed cell volume (PCV) was significantly reduced at 14 days. Blood lead...
Authors
J. Christian Franson, Thomas W. Custer
Estimating reproductive success in colonial waterbirds: An evaluation Estimating reproductive success in colonial waterbirds: An evaluation
To estimate reproductive success in a population one ideally would like to determine the number of young fledged per nesting female. However, this is difficult because often (1) the adults are not individually marked, (2) the colony is not visited daily, and (3) the investigator is unable to monitor all young until they fledge. If adults are unmarked and successful renesting occurs...
Authors
R.M. Erwin, T. W. Custer
Common tern colonies along the mid-Atlantic coast. I. Nestling chronology Common tern colonies along the mid-Atlantic coast. I. Nestling chronology
1. Sixteen Common Tern colonies in Rhode Island, New Jersey, Virginia, and North Carolina were studied from May through July 1980 by four investigators. Nests were marked during egg laying and were monitored every 5-7 days until fledging of young. 2. Results from 1980 indicate that ambient temperature differences in the four study areas account for differences in the onset of egg laying...
Authors
D. C. Smith, R.M. Erwin, T. W. Custer, J.O. Fussell
Atlas of gull and tern colonies: North Carolina to Key West, Florida Atlas of gull and tern colonies: North Carolina to Key West, Florida
No abstract available.
Authors
John W. Portnoy, R. Michael Erwin, Thomas W. Custer
Distribution, species abundance, and nesting-site use of Atlantic coast colonies of herons and their allies Distribution, species abundance, and nesting-site use of Atlantic coast colonies of herons and their allies
In 1975 and 1976, eight teams of investigators located 262 colonies of nesting herons and their allies along the Atlantic coast from Florida to Maine. Fourteen species were found in Florida, numbers decreasing to seven in Maine. Colonies censused in the extreme south and north of the study area were lower in number of species and number of adults than those in the intermediate area. More...
Authors
Thomas W. Custer, Ronald G. Osborn, W.F. Stout
Nest site and colony characteristics of wading birds in selected Atlantic Coast colonies Nest site and colony characteristics of wading birds in selected Atlantic Coast colonies
Nests of 5 species of wading birds were identified and marked during the breeding season at 6 locations from Massachusetts to North Carolina. At the end of the breeding season 12 characteristics of nest-site location were measured. Nest locations were mapped to examine dispersion and nearest neighbor relationships. Multivariate analyses were used to describe and compare sites and species...
Authors
Donald L. Beaver, Ronald G. Osborn, Thomas W. Custer
Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254 Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254
A dietary dosage of 25 ppm Aroclor 1254 fed to nine-month-old mallards Anas platyrhynchos for at least a month before egg-laying had no detrimental effect on reproductive success or nest attentiveness when hens were allowed to incubate their own eggs. The treatment caused no effect on number of hens laying, date of first egg laid or clutch size. Fertility of eggs was greater among...
Authors
T. W. Custer, G. H. Heinz
New black-crowned night heron colony found in Rhode Island New black-crowned night heron colony found in Rhode Island
No abstract available.
Authors
T. W. Custer, J.E. Myers, C.C. Allin
Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254 Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254
A dietary dosage of 25 ppm Aroclor 1254 fed to nine-month-old mallards Anas platyrhynchos for at least a month before egg-laying had no detrimental effect on reproductive success or nest attentiveness when hens were allowed to incubate their own eggs. The treatment caused no effect on number of hens laying, date of first egg laid or clutch size. Fertility of eggs was greater among...
Authors
T. W. Custer, G. H. Heinz
Response of captive, breeding mallards to oiled water Response of captive, breeding mallards to oiled water
No abstract available.
Authors
T. W. Custer, P.H. Albers