Publications

These publications showcase the significant science conducted in our Science Centers.

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January 1, 1971

DDE thins eggshells and lowers reproductive success of captive black ducks

Eggs of captive black ducks fed diets containing DDE at 10 and 30 ppm (dry weight) experienced significant shell thinning and an increase in shell cracking when compared to eggs of untreated black ducks. Eggshells from dosed ducks were: 18-24 percent thinner at the equator than shells from undosed ducks; 28-31 percent thinner at the cap; and 29-38 percent thinner at the apex. Shell cracking aver

Authors

J. R. Longcore, F. B. Samson, T.W. Whittendale

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1971

Semiquantitative determination of polychlorinated biphenyls in tissue samples by thin layer chromatography

A method is described for the analysis of polychlorinated biphenyl (PCB) compounds in tissue samples. Cleanup by hexane-aceto-nitrile partitioning and Florisil column chromatography are performed on samples before oxidative treatment to convert DDE to DCBP. PCB components are then determined semi-quantitatively by TLC. No prior separation of PCB from chlorinated pesticides is required. The lower l

Authors

B. M. Mulhern, E. Cromartie, W. L. Reichel, A. A. Belisle

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1971

A starling-deterrent wood duck nest box

In many parts of the United States, the starling (Sturnus vulgaris) has I become a serious competitor for nest boxes erected for wood ducks (Aix sponsa). Research at the Patuxent Wildlife Research Center and at Eastern Neck National Wildlife Refuge near Rock Hall, Maryland, demonstrated that horizontal nest structures with semicircular entrance holes 11 inches in diameter were acceptable to nesti

Authors

F. B. McGilvrey, F.M. Uhler

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1971