Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 185
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. Sixteen of the 1
Authors
D.A. Wiggins, R.D. Morris, I.C.T. Nisbet, T. W. Custer
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 than in t
Authors
Thomas W. Custer, Gary L. Hensler, T. Earl Kaiser
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 1980, Buc
Authors
T. W. Custer, I.C.T. Nisbet, A. J. Krynitsky
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 have ad
Authors
T. W. Custer, R.M. Erwin, C. Stafford
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 colonies were
Authors
T. W. Custer, C. M. Bunck, T. E. Kaiser
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 North Caro
Authors
T. W. Custer, B.L. Mulhern
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, reproductive
Authors
R.M. Erwin, T. W. Custer
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 residues r
Authors
J. Christian Franson, Thomas W. Custer
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 pair succ
Authors
Thomas W. Custer, William E. Davis
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 with Nort
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 (including Pelicans, Cormorants, and Skimmers)
No abstract available.
Authors
J. W. Portnoy, R.M. Erwin, T. W. Custer
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: 185
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. Sixteen of the 1
Authors
D.A. Wiggins, R.D. Morris, I.C.T. Nisbet, T. W. Custer
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 than in t
Authors
Thomas W. Custer, Gary L. Hensler, T. Earl Kaiser
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 1980, Buc
Authors
T. W. Custer, I.C.T. Nisbet, A. J. Krynitsky
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 have ad
Authors
T. W. Custer, R.M. Erwin, C. Stafford
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 colonies were
Authors
T. W. Custer, C. M. Bunck, T. E. Kaiser
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 North Caro
Authors
T. W. Custer, B.L. Mulhern
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, reproductive
Authors
R.M. Erwin, T. W. Custer
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 residues r
Authors
J. Christian Franson, Thomas W. Custer
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 pair succ
Authors
Thomas W. Custer, William E. Davis
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 with Nort
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 (including Pelicans, Cormorants, and Skimmers)
No abstract available.
Authors
J. W. Portnoy, R.M. Erwin, T. W. Custer
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