Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 167
Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254 Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254
A dietary dosage of 25 ppm Aroclor 1254 fed to nine-month-old mallards Anas platyrhynchos for at least a month before egg-laying had no detrimental effect on reproductive success or nest attentiveness when hens were allowed to incubate their own eggs. The treatment caused no effect on number of hens laying, date of first egg laid or clutch size. Fertility of eggs was greater among...
Authors
T. W. Custer, G. H. Heinz
Herons and their allies: Atlas of Atlantic Coast colonies, 1975 and 1976 Herons and their allies: Atlas of Atlantic Coast colonies, 1975 and 1976
No abstract available.
Authors
R. G. Osborn, T. W. Custer
Feeding-site description of three heron species near Beaufort, North Carolina Feeding-site description of three heron species near Beaufort, North Carolina
No abstract available.
Authors
T. W. Custer, R. G. Osborn
Seasonal trends in summer diet of the lapland longspur near Barrow Alaska USA Seasonal trends in summer diet of the lapland longspur near Barrow Alaska USA
Contents of lapland longspur [Calcarius lapponicus] stomachs and esophagi were sampled near Barrow, Alaska [USA], from May-Aug. in 1969, 1971, 1972 and 1973. Data from stomach contents were corrected for differential digestion of prey items. Longspurs shifted seasonally from larval to adult arthropods and back to larvae, responding to changes in the abundance of these prey items. Seeds...
Authors
T. W. Custer, F.A. Pitelka
Herons and their allies: atlas of Atlantic coast colonies, 1975 and 1976 Herons and their allies: atlas of Atlantic coast colonies, 1975 and 1976
No abstract available.
Authors
Ronald G. Osborn, Thomas W. Custer
Feeding habitat use by colonially-breeding herons, egrets, and ibises in North Carolina Feeding habitat use by colonially-breeding herons, egrets, and ibises in North Carolina
Nine species of herons, egrets, and ibises were followed by airplane from a nesting colony near Beaufort, North Carolina to their feeding sites. Except for Cattle Egrets, which flew exclusively to fields and dumps, the birds flew mainly to saltmarsh habitat. The selection of feeding habitats by Great Egrets and Louisiana Herons was directly related to tidal depth. The Great Egret was the...
Authors
Thomas W. Custer, Ronald G. Osborn
Science and Products
Filter Total Items: 167
Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254 Reproductive success and nest attentiveness of mallard ducks fed Aroclor 1254
A dietary dosage of 25 ppm Aroclor 1254 fed to nine-month-old mallards Anas platyrhynchos for at least a month before egg-laying had no detrimental effect on reproductive success or nest attentiveness when hens were allowed to incubate their own eggs. The treatment caused no effect on number of hens laying, date of first egg laid or clutch size. Fertility of eggs was greater among...
Authors
T. W. Custer, G. H. Heinz
Herons and their allies: Atlas of Atlantic Coast colonies, 1975 and 1976 Herons and their allies: Atlas of Atlantic Coast colonies, 1975 and 1976
No abstract available.
Authors
R. G. Osborn, T. W. Custer
Feeding-site description of three heron species near Beaufort, North Carolina Feeding-site description of three heron species near Beaufort, North Carolina
No abstract available.
Authors
T. W. Custer, R. G. Osborn
Seasonal trends in summer diet of the lapland longspur near Barrow Alaska USA Seasonal trends in summer diet of the lapland longspur near Barrow Alaska USA
Contents of lapland longspur [Calcarius lapponicus] stomachs and esophagi were sampled near Barrow, Alaska [USA], from May-Aug. in 1969, 1971, 1972 and 1973. Data from stomach contents were corrected for differential digestion of prey items. Longspurs shifted seasonally from larval to adult arthropods and back to larvae, responding to changes in the abundance of these prey items. Seeds...
Authors
T. W. Custer, F.A. Pitelka
Herons and their allies: atlas of Atlantic coast colonies, 1975 and 1976 Herons and their allies: atlas of Atlantic coast colonies, 1975 and 1976
No abstract available.
Authors
Ronald G. Osborn, Thomas W. Custer
Feeding habitat use by colonially-breeding herons, egrets, and ibises in North Carolina Feeding habitat use by colonially-breeding herons, egrets, and ibises in North Carolina
Nine species of herons, egrets, and ibises were followed by airplane from a nesting colony near Beaufort, North Carolina to their feeding sites. Except for Cattle Egrets, which flew exclusively to fields and dumps, the birds flew mainly to saltmarsh habitat. The selection of feeding habitats by Great Egrets and Louisiana Herons was directly related to tidal depth. The Great Egret was the...
Authors
Thomas W. Custer, Ronald G. Osborn