Skip to main content
U.S. flag

An official website of the United States government

Publications

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

Filter Total Items: 16912

Silurian tectonic history of Penobscot Bay region, Maine Silurian tectonic history of Penobscot Bay region, Maine

Early Paleozoic amalgamation of composite terranes was contemporaneous at widely separated regions that were later accreted to either ancestral North America or to Gondwana as those two continents approached each other. Peri-Gondwanan terranes formed from Late Cambrian and Early Ordovician rocks were amalgamated in the Late Ordovician and Early Silurian to form the Salinic orogenic belt...
Authors
D. B. Stewart, J. D. Unger, D. R. Hutchinson

Glacial removal of late Cenozoic subglacially emplaced volcanic edifices by the West Antarctic ice sheet Glacial removal of late Cenozoic subglacially emplaced volcanic edifices by the West Antarctic ice sheet

Local maxima of the horizontal gradient of pseudogravity from closely spaced aeromagnetic surveys over the Ross Sea, northwestern Ross Ice Shelf, and the West Antarctic ice sheet, reveal a linear magnetic rift fabric and numerous subcircular, high-amplitude anomalies. Geophysical data indicate two or three youthful volcanic edifices at widely separated areas beneath the sea and ice cover...
Authors
John C. Behrendt, D. D. Blankenship, D. Damaske, A. K. Cooper

Protein retention and liver aminotransferase activities in Atlantic salmon fed diets containing different energy sources Protein retention and liver aminotransferase activities in Atlantic salmon fed diets containing different energy sources

Atlantic salmon (Salmo salar) fingerlings (14.4 g) were fed diets containing either glucose, dextrin, raw corn starch and lipid, or a high protein U.S. Fish and Wildlife Service open-formula diet (ASD2-30) for 12 weeks. Significant differences in weight gain and feed: gain ratio were not observed among salmon fed the diets containing glucose, dextrin or ASD2-30. Diets containing dextrin...
Authors
K. Fynn-Aikins, S. G. Hughes, G.W. Vandenberg

Circulating growth hormone, cortisol and thyroxine levels after 24 h seawater challenge of yearling coho salmon at different developmental stages Circulating growth hormone, cortisol and thyroxine levels after 24 h seawater challenge of yearling coho salmon at different developmental stages

The response of the endocrine system to short-term exposure to sea water (SW) was examined before, during and after the parr-smolt transformation of coho salmon. Five transfers of yearling coho salmon (Oncorhynchus kisutch) from fresh water (FW) to FW, or from FW to SW for 24 h were carried out between March and September. Condition factor declined significantly in late April, and gill...
Authors
G. Young, Stephen D. McCormick, Bjorn Thrandur Bjornsson, H. A. Bern

Effects of prey density and short term food deprivation on the growth and survival of American shad larvae Effects of prey density and short term food deprivation on the growth and survival of American shad larvae

Growth and survival of 16-and 18-day-old American larvae (Alosa sapidissima) increased with prey density (0, 500, and 1000 Artemia l−1), though differences were not always significant. Significant differences were not observed in growth parameters and survival for larvae fed 500 v. 1000 Artemia 1−1 in laboratory experiments. Food deprivation for as little as 2 days had significant...
Authors
J. H. Johnson, D. S. Dropkin
Was this page helpful?