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Filter Total Items: 16785

Population ecology of the mallard VIII: Winter distribution patterns and survival rates of winter-banded mallards

In the present report we address questions about winter distribution patterns and survival rates of North American mallards Anas platyrhynchos. Inferences are based on analyses of banding and recovery data from both winter and preseason banding period. The primary wintering range of the mallard was dividded into 45 minor reference areas and 15 major reference areas which were used to summarize w
Authors
James D. Nichols, James E. Hines

Pelecaniform feeding ecology

No abstract available.
Authors
R.W. Schreiber, R. B. Clapp

Owl telemetry techniques

No abstract available.
Authors
T.H. Nicholls, M.R. Fuller

An outbreak of eastern equine encephalitis virus in captive whooping cranes

No abstract available.
Authors
J. W. Carpenter, F. J. Dein, G.G. Clark

Relationships between nesting populations of wading birds and habitat features along the Atlantic Coast

Using previously published atlas data for 122 mixed-species wading bird colonies on islands along the Atlantic coast (Maine to Florida, 1976-77), we examined relationships between population sizes of 11 species of egrets, herons, ibises, and wood storks (Mycteria americana) and nine habitat variables. On nautical charts, we measured four island characteristics (area, length, width, shape), three i
Authors
R.M. Erwin, J. A. Spendelow, P.H. Geissler, B.K. Williams

Field methods to evaluate effects of pesticides on wildlife of the northwestern United States

Field .methods used to evaluate the impact of organochlorine and organophosphate pesticides on wildlife populations in the Pacific Northwest are reviewed. Five field studies, presented in a CASE HISTORY format, illustrate study designs .and thetypes of information collected. The pesticides investigated included DDT, heptachlor, endr1n, and famphur, and the species studied included the American kes
Authors
C. J. Henny