Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 167
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus ) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum 12 km). The mean direction of landing sites differed seasonally for flights from Spider Island...
Authors
T. W. Custer, C. Bunck
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
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
Contaminant exposure of willets feeding in agricultural drainages of the lower Rio Grande valley of south Texas Contaminant exposure of willets feeding in agricultural drainages of the lower Rio Grande valley of south Texas
Willets (Catoptrophorus semipalmatus) were collected in June and August 1986 at the outlets of two agricultural drainages into the Lower Laguna Madre of South Texas and at two other Texas coastal sites. Mean liver concentration of arsenic was higher in August than June. Over 20% of the livers had arsenic concentrations elevated above a suggested background level of 5.0 ppm dry weight (DW...
Authors
T. W. Custer, C. A. Mitchell
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 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
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
Science and Products
Filter Total Items: 167
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus ) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum 12 km). The mean direction of landing sites differed seasonally for flights from Spider Island...
Authors
T. W. Custer, C. Bunck
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
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
Contaminant exposure of willets feeding in agricultural drainages of the lower Rio Grande valley of south Texas Contaminant exposure of willets feeding in agricultural drainages of the lower Rio Grande valley of south Texas
Willets (Catoptrophorus semipalmatus) were collected in June and August 1986 at the outlets of two agricultural drainages into the Lower Laguna Madre of South Texas and at two other Texas coastal sites. Mean liver concentration of arsenic was higher in August than June. Over 20% of the livers had arsenic concentrations elevated above a suggested background level of 5.0 ppm dry weight (DW...
Authors
T. W. Custer, C. A. Mitchell
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 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
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