Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16746
What do we know about wolves and what more do we need to learn? What do we know about wolves and what more do we need to learn?
No abstract available.
Authors
L. David Mech
The ecology of cormorants: some research needs and recommendations The ecology of cormorants: some research needs and recommendations
Concerns about Double-crested Cormorants (Phalacrocorax auritus) have arisen because of their rapid population increase across North America and their economic impact on several aquaculture and commercial fish industries. In spite of the concern for cormorants, little published research is available that addresses either basic population biology questions or management issues. Based on a
Authors
R.M. Erwin
Wildlife toxicity testing Wildlife toxicity testing
Reports of anthropogenic environmental contaminants affecting free-ranging wildlife first began to accumulate during the Industrial Revolution of the 1850s. early reports included cases of arsenic and lead shot ingestion, and industrial smokestack emission toxicity. One early report described the death of fallow deer (Dama dama) due to arsenic emissions from a silver foundry in Germany...
Authors
David J. Hoffman
Use of stable isotopes of carbon, nitrogen, and sulfer to identify sources of nitrogen in surface waters in the Lower Susquehanna River basin, Pennsylvania Use of stable isotopes of carbon, nitrogen, and sulfer to identify sources of nitrogen in surface waters in the Lower Susquehanna River basin, Pennsylvania
Stable isotopes of carbon (C), nitrogen (N), and sulfur (S) in nitrogen sources and nearby samples of topsoil, subsoil, runoff water, and stream water were measured to evaluate the feasibility of using isotopic data to identify nitrogen sources in stream water from forested, agricultural, or suburban land-use areas. Chemical and isotopic compositions were measured for six N-source types...
Authors
C.A. Cravotta
Diel feeding ecology of three species of aquatic insects Diel feeding ecology of three species of aquatic insects
Aspects of the diel feeding ecology of the odonate nymphs Anax Junius and Ischnura verticalis and the ephemeropteran Callibaetis fluctuans were examined over a 24-h period in a small pond. Detrital material was the primary food of both A. Junius and I. verticalis. Aquatic insects (mainly C. fluctuans) were the second ranking prey in the diel diet of A. Junius, whereas ostracods were the...
Authors
J. H. Johnson
Hormonal control of gill Na+, K+ and -ATPase and chloride cell function Hormonal control of gill Na+, K+ and -ATPase and chloride cell function
No abstract available at this time
Authors
S. D. McCormick
Ontogenetic behavior of shortnose sturgeon, Acipenser brevirostrum Ontogenetic behavior of shortnose sturgeon, Acipenser brevirostrum
No abstract available.
Authors
A.M. Richmond, B. Kynard
Enzyme immunoassay for plasma cortisol in fish Enzyme immunoassay for plasma cortisol in fish
No abstract available at this time
Authors
S. D. McCormick, J. B. Carey
Nonlethal procedures for detecting and monitoring furunculosis in salmon Nonlethal procedures for detecting and monitoring furunculosis in salmon
No abstract available at this time
Authors
R. C. Cipriano, L.A. Ford, J.D. Teska
Assessment of water quality in the upper Pine Creek, Pennsylvania watershed following a sewage plant upgrade Assessment of water quality in the upper Pine Creek, Pennsylvania watershed following a sewage plant upgrade
No abstract available.
Authors
K.A. Meyer, D. V. Rottiers
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
Acid Rain Acid Rain
Although acid rain is fading as a political issue in the United States and funds for research in this area have largely disappeared, the acidity of rain in the Eastern United States has not changed significantly over the last decade, and it continues to be a serious environmental problem. Acid deposition (commonly called acid rain) is a term applied to all forms of atmospheric deposition...
Authors
Owen P. Bricker, Karen C. Rice