Publications
These publications showcase the significant science conducted in our Science Centers.
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Southeastern Pennsylvania ground water protected area Southeastern Pennsylvania ground water protected area
Geographical Information System data sets were developed by the U.S. Geological Survey in cooperation with the Delaware River Basin Commission (DRBC). These data are related to groundwater resources for the DRBC's Southeastern Pennsylvania Groundwater Protected Area.
Authors
Water Resources Division U.S. Geological Survey
Dasypodidae Borner, 1919 (Insecta, Hymenoptera): Proposed emendation of spelling to Dasypodaidae, so removing the homonymy with Dasypodidae Gray, 1821 (Mammalia, Xenarthra) Dasypodidae Borner, 1919 (Insecta, Hymenoptera): Proposed emendation of spelling to Dasypodaidae, so removing the homonymy with Dasypodidae Gray, 1821 (Mammalia, Xenarthra)
The family-group name DASYPODIDAE Borner, 1919 (Insecta, Hymenoptera) is a junior homonym Of DASYPODIDAE Gray, 1821 (Mammalia, Xenarthra). It is proposed that the homonymy between the two names, which relate to short-tongued bees and armadillos respectively, should be removed by emending the stem of the generic name Dasypoda Latreille, 1802, on which the insect familygroup name is based...
Authors
B.A. Alexander, C.D. Michener, A. L. Gardner
Brood sizes of sympatric American black ducks and mallards in Maine Brood sizes of sympatric American black ducks and mallards in Maine
The long-term decline of the American black duck (Anas rubripes) population has been attributed to lower productivity of black ducks that might have been excluded from fertile agricultural wetlands by mallards (Anas platyrhynchos). We monitored broods on 53 wetlands in 1993 and on 58 wetlands in 1994 to determine mean brood sizes of black ducks and mallards in forested and agricultural...
Authors
J. R. Longcore, D.A. Clugston, D.G. McAuley
Managing island biotas: Can indigenous species be protected from introduced predators such as the brown treesnake? Managing island biotas: Can indigenous species be protected from introduced predators such as the brown treesnake?
No abstract available.
Authors
G.H. Rodda, T. H. Fritts, G. Perry, E.W. Campbell
Blood changes in mallards exposed to white phosphorus Blood changes in mallards exposed to white phosphorus
White phosphorus (P4) has been extensively used by the military for various purposes, including marking artillery impacts and as an obscurant. Target practice in an Alaskan tidal marsh during the last 4 decades has deposited large amounts of P4 particles in sediments and water, which have resulted in die-offs of several waterfowl species. Because the toxicity of P4 in birds has not been...
Authors
Donald W. Sparling, S. Vann, Robert A. Grove
Validity of the Red Wolf: Response to Roy et al. Validity of the Red Wolf: Response to Roy et al.
No access available.
Authors
R. M. Nowak, N.E. Federoff
Increasing point-count duration increases standard error Increasing point-count duration increases standard error
We examined data from point counts of varying duration in bottomland forests of west Tennessee and the Mississippi Alluvial Valley to determine if counting interval influenced sampling efficiency. Estimates of standard error increased as point count duration increased both for cumulative number of individuals and species in both locations. Although point counts appear to yield data with...
Authors
W.P. Smith, D.J. Twedt, P.B. Hamel, R.P. Ford, D.A. Wiedenfeld, R.J. Cooper
Methylmercury chloride and selenomethionine interactions on health and reproduction in mallards Methylmercury chloride and selenomethionine interactions on health and reproduction in mallards
Adult mallards (Anas platyrhynchos) were fed a control diet or diets containing 10 ppm mercury as methylmercury chloride, 10 ppm selenium as seleno-DL-methionine, or 10 ppm mercury plus 10 ppm selenium. One of 12 adult males fed 10 ppm mercury died, and eight others suffered paralysis of the legs by the time the study was terminated. However, when the diet contained 10 ppm selenium in...
Authors
G. H. Heinz, D. J. Hoffman
Comparative developmental toxicity of planar polychlorinated biphenyl congeners in chickens, American kestrels, and common terns Comparative developmental toxicity of planar polychlorinated biphenyl congeners in chickens, American kestrels, and common terns
The effects of polychlorinated biphenyl (PCB) congeners, PCB 126 (3,3′,4,4′,5-pentaCB) and PCB 77 (3,3′4,4′-tetraCB), were examined in chicken (Gallus gallus), American kestrel (Falco sparverius), and common tern (Sterna hirundo) embryos through hatching, following air cell injections on day 4. PCB 126 caused malformations and edema in chickens starting at 0.3 ppb, in kestrels at 2.3 to...
Authors
D. J. Hoffman, M. J. Melancon, P. N. Klein, J.D. Eisemann, J. W. Spann
Dispersal of mimetic seeds of three species of Ormosia (Leguminosae) Dispersal of mimetic seeds of three species of Ormosia (Leguminosae)
Seeds with ‘imitation arils’ appear wholly or partially covered by pulp or aril but actually carry no fleshy material. The mimetic seed hypothesis to explain this phenomenon proposes a parasitic relationship in which birds are deceived into dispersing seeds that resemble bird-dispersed fruits, without receiving a nutrient reward. The hard-seed for grit hypothesis proposes a mutualistic
Authors
M.S. Foster, L.S. DeLay