Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 166
Effects of mercury, selenium, and organochlorine contaminants on reproduction of Forster's terns and black skimmers nesting in a contaminated Texas bay Effects of mercury, selenium, and organochlorine contaminants on reproduction of Forster's terns and black skimmers nesting in a contaminated Texas bay
Mean mercury (0.40 μg/g), and geometric mean DDE (1.6 μg/g) and polychlorinated biphenyl (PCB) (2.3 μg/g) concentrations in Forster's tern (Sterna forsteri) eggs from Lavaca Bay were higher than those in tern eggs from a reference area in San Antonio Bay, but residues were not correlated with hatching success. Nest success was similar between bays. Selenium levels in Lavaca Bay tern eggs...
Authors
Kirke A. King, Thomas W. Custer, J. S. Quinn
Green coloration of recently laid black-crowned night-heron eggs Green coloration of recently laid black-crowned night-heron eggs
Color of Black-crowned Night-Heron (Nycticorax nycticorax) eggs of known laying order was quantified in a Wisconsin (USA) colony. Eggs were of greener intensity on the day of laying and one day thereafter than earlier laid eggs within a clutch. Egg color can be used to identify clutches within one day after clutch completion and to assign laying order within clutches during this period.
Authors
T. W. Custer
Growth rates of great egret, snowy egret and black-crowned night-heron chicks Growth rates of great egret, snowy egret and black-crowned night-heron chicks
Growth rates of Great Erget (Casmerodius albus), Snowy Erget (Egretta thula), and Black-crowned Night-Heron (Nycticorax nycticorax) chicks to 18 days-of-age were estimated from repeated measurements of chicks in broods of three young. Weight gain (g/day) or increase in length (mm/day) of forearm, tarsus, or culmen did not between Black-crowned Night-Heron chicks at a colony in Rhode...
Authors
T. W. Custer, D.W. Peterson
Organochlorines accumulate in heron and egret chicks sampled in the Houston Ship Channel Organochlorines accumulate in heron and egret chicks sampled in the Houston Ship Channel
The National Contaminant Monitoring Program (NCBP) is an effort of the U.S. Fish and Wildlife Service to measure concentrations of DDT and other persistent chemicals in the environment and to quantify changes in these levels. The NCBP has established a network of sampling stations in segments of the environment for which Federal agencies have authority. The wildlife component of this...
Authors
T. W. Custer
The occurrence of chlorostyrenes in egrets and herons collected in Galveston Bay The occurrence of chlorostyrenes in egrets and herons collected in Galveston Bay
No abstract available.
Authors
C.P. Rice, T. W. Custer
Herons and egrets as proposed indicators of estuarine contamination in the United States Herons and egrets as proposed indicators of estuarine contamination in the United States
The National Contaminant Biomonitoring Program of the U.S. Fish and Wildlife Service Includes the sampling of freshwater fish, starlings, and duck wings. In order to include an estuarine component, herons and egrets are being evaluated. Organochlorine concentrations were measured In eggs and chicks of Snowy Egrets Egretta thula, Great Egrets Casmerodius albus, and Black-crowned Night...
Authors
T. W. Custer, Barnett A. Rattner, H. M. Ohlendorf, M. J. Melancon
Science and Products
Filter Total Items: 166
Effects of mercury, selenium, and organochlorine contaminants on reproduction of Forster's terns and black skimmers nesting in a contaminated Texas bay Effects of mercury, selenium, and organochlorine contaminants on reproduction of Forster's terns and black skimmers nesting in a contaminated Texas bay
Mean mercury (0.40 μg/g), and geometric mean DDE (1.6 μg/g) and polychlorinated biphenyl (PCB) (2.3 μg/g) concentrations in Forster's tern (Sterna forsteri) eggs from Lavaca Bay were higher than those in tern eggs from a reference area in San Antonio Bay, but residues were not correlated with hatching success. Nest success was similar between bays. Selenium levels in Lavaca Bay tern eggs...
Authors
Kirke A. King, Thomas W. Custer, J. S. Quinn
Green coloration of recently laid black-crowned night-heron eggs Green coloration of recently laid black-crowned night-heron eggs
Color of Black-crowned Night-Heron (Nycticorax nycticorax) eggs of known laying order was quantified in a Wisconsin (USA) colony. Eggs were of greener intensity on the day of laying and one day thereafter than earlier laid eggs within a clutch. Egg color can be used to identify clutches within one day after clutch completion and to assign laying order within clutches during this period.
Authors
T. W. Custer
Growth rates of great egret, snowy egret and black-crowned night-heron chicks Growth rates of great egret, snowy egret and black-crowned night-heron chicks
Growth rates of Great Erget (Casmerodius albus), Snowy Erget (Egretta thula), and Black-crowned Night-Heron (Nycticorax nycticorax) chicks to 18 days-of-age were estimated from repeated measurements of chicks in broods of three young. Weight gain (g/day) or increase in length (mm/day) of forearm, tarsus, or culmen did not between Black-crowned Night-Heron chicks at a colony in Rhode...
Authors
T. W. Custer, D.W. Peterson
Organochlorines accumulate in heron and egret chicks sampled in the Houston Ship Channel Organochlorines accumulate in heron and egret chicks sampled in the Houston Ship Channel
The National Contaminant Monitoring Program (NCBP) is an effort of the U.S. Fish and Wildlife Service to measure concentrations of DDT and other persistent chemicals in the environment and to quantify changes in these levels. The NCBP has established a network of sampling stations in segments of the environment for which Federal agencies have authority. The wildlife component of this...
Authors
T. W. Custer
The occurrence of chlorostyrenes in egrets and herons collected in Galveston Bay The occurrence of chlorostyrenes in egrets and herons collected in Galveston Bay
No abstract available.
Authors
C.P. Rice, T. W. Custer
Herons and egrets as proposed indicators of estuarine contamination in the United States Herons and egrets as proposed indicators of estuarine contamination in the United States
The National Contaminant Biomonitoring Program of the U.S. Fish and Wildlife Service Includes the sampling of freshwater fish, starlings, and duck wings. In order to include an estuarine component, herons and egrets are being evaluated. Organochlorine concentrations were measured In eggs and chicks of Snowy Egrets Egretta thula, Great Egrets Casmerodius albus, and Black-crowned Night...
Authors
T. W. Custer, Barnett A. Rattner, H. M. Ohlendorf, M. J. Melancon