Daniel Day
Dan is a Wildlife Biologist at the Eastern Ecological Science Center in Laurel, MD.
Duties include field and laboratory research on wildlife, including study of their diet and habitat they occupy. Current research focuses on resource utilization by various avian species residing or over-wintering on the Chesapeake Bay.
Science and Products
Filter Total Items: 18
Toxicity of Anacostia River, Washington, D.C., USA, sediment fed to mute swans (Cygnus olor)
Sediment ingestion is sometimes the principal route by which waterfowl are exposed to environmental contaminants, and at severely contaminated sites waterfowl have been killed by ingesting sediment. Mute swans (Cygnus olor) were fed a diet for 6 weeks with a high but environmentally realistic concentration (24%) of sediment from the moderately polluted Anacostia River in the District of Columbia,
Authors
W. N. Beyer, D. Day, M. J. Melancon, L. Sileo
Acute toxicity and sublethal effects of white phosphorus in mute swans, Cygnus olor
Among the waterfowl affected by white phosphorus (P4) at a military base in Alaska are tundra (Cygnus columbianus) and trumpeter (C. buccinator) swans. To estimate the toxicity of P4 to swans and compare the toxic effects to those of mallards (Anas platyrhynchos), we dosed 30 juvenile mute swans (C. olor) with 0 to 5.28 mg P4/kg body weight. The calculated LD50 was 3.65 mg/kg (95% CI: 1.40 to 4.68
Authors
D. W. Sparling, D. Day, P. Klein
Metal and sediment ingestion by dabbling ducks
The chemical analysis of intestinal digesta from hunter-killed carcasses or of wildlife scat is a promising means of estimating the exposure of wildlife to those environmental contaminants that, like lead, are poorly absorbed in the digestive tract. When evaluating contaminants at a site, biologists may find the results of this non-destructive approach more straightforward to interpret in terms o
Authors
W. N. Beyer, J. Spann, D. Day
Comparison of basal and induced cytochromes P450 in 6 species of waterfowl
Cytochrome P450-associated monooxygenase activities were measured in control and prototype inducer-treated mallard duck, black duck, wood duck, lesser scaup, Canada goose and mute swan. Ages of the birds ranged from pipping embryos (that were treated approximately 3 days before pipping) to adults. Three or more of the following hepatic microsomal monooxygenases were assayed in each species: Benzy
Authors
M. J. Melancon, Barnett A. Rattner, D. J. Hoffman, D. Beeman, D. Day, T. Custer
Relation of lead exposure to sediment ingestion in mute swans on the Chesapeake Bay, USA
Although wildlife risk assessments are generally based on the accumulation of environmental contaminants through food chains, wildlife may also ingest contaminants incidentally with sediment. Forty-two mute swans (Cygnus olor) were collected from unpolluted portions of central Chesapeake Bay, Maryland, USA, in spring 1995, and their intestinal digesta were analyzed for 13 metals (aluminum [Al], bo
Authors
W. N. Beyer, D. Day, Alexandra Morton, Y. Pachepsky
Responses of amphibian populations to water and soil factors in experimentally-treated aquatic macrocosms
Survival of anuran embryos and tadpoles is reduced in acidic (pH<5.0) waters under laboratory conditions. However, field data on the presence-absence of amphibian species and acidity are equivocal. This study attempts to reconcile some of this discrepancy by using macrocosms to examine the interaction of soil type and water acidification on free-ranging tadpole populations. Tadpoles were caught wi
Authors
D. W. Sparling, T. P. Lowe, D. Day, K. Dolan
Science and Products
Filter Total Items: 18
Toxicity of Anacostia River, Washington, D.C., USA, sediment fed to mute swans (Cygnus olor)
Sediment ingestion is sometimes the principal route by which waterfowl are exposed to environmental contaminants, and at severely contaminated sites waterfowl have been killed by ingesting sediment. Mute swans (Cygnus olor) were fed a diet for 6 weeks with a high but environmentally realistic concentration (24%) of sediment from the moderately polluted Anacostia River in the District of Columbia,
Authors
W. N. Beyer, D. Day, M. J. Melancon, L. Sileo
Acute toxicity and sublethal effects of white phosphorus in mute swans, Cygnus olor
Among the waterfowl affected by white phosphorus (P4) at a military base in Alaska are tundra (Cygnus columbianus) and trumpeter (C. buccinator) swans. To estimate the toxicity of P4 to swans and compare the toxic effects to those of mallards (Anas platyrhynchos), we dosed 30 juvenile mute swans (C. olor) with 0 to 5.28 mg P4/kg body weight. The calculated LD50 was 3.65 mg/kg (95% CI: 1.40 to 4.68
Authors
D. W. Sparling, D. Day, P. Klein
Metal and sediment ingestion by dabbling ducks
The chemical analysis of intestinal digesta from hunter-killed carcasses or of wildlife scat is a promising means of estimating the exposure of wildlife to those environmental contaminants that, like lead, are poorly absorbed in the digestive tract. When evaluating contaminants at a site, biologists may find the results of this non-destructive approach more straightforward to interpret in terms o
Authors
W. N. Beyer, J. Spann, D. Day
Comparison of basal and induced cytochromes P450 in 6 species of waterfowl
Cytochrome P450-associated monooxygenase activities were measured in control and prototype inducer-treated mallard duck, black duck, wood duck, lesser scaup, Canada goose and mute swan. Ages of the birds ranged from pipping embryos (that were treated approximately 3 days before pipping) to adults. Three or more of the following hepatic microsomal monooxygenases were assayed in each species: Benzy
Authors
M. J. Melancon, Barnett A. Rattner, D. J. Hoffman, D. Beeman, D. Day, T. Custer
Relation of lead exposure to sediment ingestion in mute swans on the Chesapeake Bay, USA
Although wildlife risk assessments are generally based on the accumulation of environmental contaminants through food chains, wildlife may also ingest contaminants incidentally with sediment. Forty-two mute swans (Cygnus olor) were collected from unpolluted portions of central Chesapeake Bay, Maryland, USA, in spring 1995, and their intestinal digesta were analyzed for 13 metals (aluminum [Al], bo
Authors
W. N. Beyer, D. Day, Alexandra Morton, Y. Pachepsky
Responses of amphibian populations to water and soil factors in experimentally-treated aquatic macrocosms
Survival of anuran embryos and tadpoles is reduced in acidic (pH<5.0) waters under laboratory conditions. However, field data on the presence-absence of amphibian species and acidity are equivocal. This study attempts to reconcile some of this discrepancy by using macrocosms to examine the interaction of soil type and water acidification on free-ranging tadpole populations. Tadpoles were caught wi
Authors
D. W. Sparling, T. P. Lowe, D. Day, K. Dolan