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Geology topics

T.J. Peterle

Publications and source records attributed to T.J. Peterle.

14 recordsLinked to original sources
USGS1974

Effects of DDT on bobwhite quail adrenal gland

A wide range of responses to sublethal levels of DDT exist, many of which are species specific and vary within each species depending upon age, sex, and physiological state. Sublethal levels of DDT do cause an increase in the adrenal cortical tissue of bobwhite quail, which may cause increased secretion of corticosteroids, and in turn affect reproduction. A delicate homeostatic balance exists within the avian endocrine system which may be disturbed by feeding sublethal levels of chlorinated hydrocarbon pesticides. This adverse effect on the endocrine system may cause subtle reproductive failures which go unnoticed until the population is greatly reduced.

Bulletin of Environmental Contamination and Toxico↗
USGS1969

Pyramiding damage

Explore the source record for details and available documents.

Environment↗
USGS1968

Possible differentiation of natal areas of North American waterfowl by neutron activation analysis

The possibility of using neutron activation analyses to differentiate sources of North American waterfowl was investigated by irradiating rectrices and wing bones of birds collected in several localities, and comparing the characteristic gamma-ray spectra. Canada goose ( Branta canadensis ) rectrices from Oregon specimens could be distinguished from those taken in Wisconsin and Colorado based on higher levels of Mn. Mallard ( Anas platyrhynchos ), black duck ( A. rubripes ), and blue-winged teal ( A. discors ) wing bones from Wisconsin, Colorado, and New Brunswick could not be clearly identified as to locality from levels of Ca, Al, Na, Mn, and Cl.

Colorado, Oregon, Wisconsin↗