Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 167
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
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
Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons
The authors' objective was to describe egg size in relation to laying order for Great Egrets (Casmerodius albus ), Snowy Egrets (Egretta thula ), and Black-crowned Night-Herons (Nycticorax nycticorax ) in a southern Texas colony and Great Egrets in a southern Florida colony. Based on egg-size patterns in other colonial waterbirds and the occurrence of brood reduction in egrets and herons...
Authors
T. W. Custer, P. C. Frederick
Organochlorines, mercury, and selenium in wintering shorebirds from Washington and California Organochlorines, mercury, and selenium in wintering shorebirds from Washington and California
Dunlins Caldris alpina , and black-bellied plovers, Pluvialis squatarola , were collected in Washington and California during the winter of 1984-85; long-billed dowitchers, Limnodromus scolopaceus , were collected in California. Pooled breast muscles were analyzed for organochlorines and pooled livers for mercury and selenium. DDE was detected in all eight dunlin, three of five dowitcher...
Authors
T. W. Custer, J.P. Myers
Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons
The nesting biology of the family Ardeidae (bitterns, herons, and egrets) has been intensively studied (e.g., Owen 1960, Milstein et al. 1970, Werschkul 1979), but egg size in relation to laying order bas not received attention. The last egg laid in gull and tern clutches is generally smaller than preceding eggs (e.g., Parsons 1970, Nisbet 1978). The relative size of the final egg in a...
Authors
T. W. Custer, P. C. Frederick
Science and Products
Filter Total Items: 167
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
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
Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons
The authors' objective was to describe egg size in relation to laying order for Great Egrets (Casmerodius albus ), Snowy Egrets (Egretta thula ), and Black-crowned Night-Herons (Nycticorax nycticorax ) in a southern Texas colony and Great Egrets in a southern Florida colony. Based on egg-size patterns in other colonial waterbirds and the occurrence of brood reduction in egrets and herons...
Authors
T. W. Custer, P. C. Frederick
Organochlorines, mercury, and selenium in wintering shorebirds from Washington and California Organochlorines, mercury, and selenium in wintering shorebirds from Washington and California
Dunlins Caldris alpina , and black-bellied plovers, Pluvialis squatarola , were collected in Washington and California during the winter of 1984-85; long-billed dowitchers, Limnodromus scolopaceus , were collected in California. Pooled breast muscles were analyzed for organochlorines and pooled livers for mercury and selenium. DDE was detected in all eight dunlin, three of five dowitcher...
Authors
T. W. Custer, J.P. Myers
Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons
The nesting biology of the family Ardeidae (bitterns, herons, and egrets) has been intensively studied (e.g., Owen 1960, Milstein et al. 1970, Werschkul 1979), but egg size in relation to laying order bas not received attention. The last egg laid in gull and tern clutches is generally smaller than preceding eggs (e.g., Parsons 1970, Nisbet 1978). The relative size of the final egg in a...
Authors
T. W. Custer, P. C. Frederick