Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16784
DDT contamination at Wheeler National Wildlife Refuge
Disposal of industrial waste resulted in massive DDT contamination atWheeler National Wildlife Refuge, Alabama. Nearly a decade after the cessation of DDT manufacturing at the facility responsible, concentrations of DDT residues in the local fauna are still high enough to suggest avian reproductive impairment and mortality. Populations of fish-eating birds are low, endangered species are being ex
Authors
T. J. O'Shea, W.J. Fleming, E. Cromartie
Food use and nutrition of black ducks nesting in Maine
Based on 32 adult black ducks (Anas rubripes) collected during the nesting seasons of 1974-76, the proportion of macro invertebrates (as aggregate [average] percent of dry weight) in the diet of males, egg-laying females, and postlaying females was 60, 75, and 55%, respectivey. Sample sizes were small, and the differences associated with sex and reproductive condition were not signficant. Mollus
Authors
K. J. Reinecke, R.B. Owen
A variable circular-plot method for estimated bird numbers
A bird census method is presented that is designed for tall, structurally complex vegetation types, and rugged terrain. With this method the observer counts all birds seen or heard around a station, and estimates the horizontal distance from the station to each bird. Count periods at stations vary according to the avian community and structural complexity of the vegetation. The density of each
Authors
R.T. Reynolds, J. M. Scott, R.A. Nussbaum
Brief observations on the breeding biology of the flammulated owl in Colorado
No abstract available.
Authors
M.L. Richmond, L.R. DeWeese, R.E. Pillmore
Thirty-second winter bird-population study. 9. Hickory--oak--ash floodplain forest
No abstract available.
Authors
C.S. Robbins
Thirty-second winter bird-population study. 9a. Upland tulip-tree--maple--oak forest
No abstract available.
Authors
C.S. Robbins
Atlantic Flyway review: Region V
Four of last year's Maryland stations were either discontinued or banded too few birds to report their results in 1978; these were Cloisters in Baltimore County, Cylburn in Baltimore City, tum Suden Sanctuary in Harford County, and Sandy Point State Park in Anne Arundel County. Banding was severely curtailed at Damsite, Maryland's last remaining Eastern Shore Station. Each of the other stations in
Authors
Chandler S. Robbins
Computer simulation models as tools for identifying research needs: A black duck population model
Existing data on the mortality and production rates of the black duck (Anas rubripes) were used to construct a WATFIV computer simulation model. The yearly cycle was divided into 8 phases: hunting, wintering, reproductive, molt, post-molt, and juvenile dispersal mortality, and production from original and renesting attempts. The program computes population changes for sex and age classes during ea
Authors
J.K. Ringelman, J. R. Longcore
Deer distribution in relation to wolf pack territory edges
No abstract available.
Authors
L. D. Mech, D.K. Dawson, J.M. Peek, M. Korb, L.L. Rogers
Records of nests, eggs, nestlings, and cavity nesting of endemic passerine birds in Hawaii
No abstract available.
Authors
J. M. Scott, J.L. Sincock, A.J. Berger
Cavity nesting of the Akepa on the island of Hawaii
No abstract available.
Authors
J.L. Sincock, J. M. Scott