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
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