Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16743
Early growth of roseate terns chicks as an index of parental quality Early growth of roseate terns chicks as an index of parental quality
No abstract available.
Authors
I.C.T. Nisbet, J. A. Spendelow, Jeff S. Hatfield, G. Gough, James M. Zingo
Monitoring Canadian bird populations with winter counts Monitoring Canadian bird populations with winter counts
Two winter bird surveys in Canada have range-wide population monitoring potential: Christmas Bird Counts (CBCs) and Project FeederWatch (PFW). CBC trends are shown to be correlated to Breeding Bird Survey (BBS) trends, whether or not part of the winter range lies outside the CBC coverage area. Some species are poorly covered by this survey (e.g. seabirds, nocturnal species, and...
Authors
Erica H. Dunn, J.R. Sauer
Whooping crane mortality at Patuxent Wildlife Research Center, 1982-95 Whooping crane mortality at Patuxent Wildlife Research Center, 1982-95
Whooping cranes (Grus americana) have been reared at Patuxent Wildlife Research Center since 1966. During 1982-95 there were 103 mortalities caused by infectious and parasitic diseases (46%), trauma (21%), anatomic abnormalities (17%), miscellaneous conditions (12%), and open or no diagnoses (5%). The implications that disease may have on new whooping crane flocks in Florida and Canada...
Authors
Glenn H. Olsen, J.A. Taylor, G.F. Gee
Ecotoxicology of aluminum to fish and wildlife Ecotoxicology of aluminum to fish and wildlife
The toxicity of aluminum has been studied extensively in fish, less so in invertebrates, amphibians, and birds, and not at all in reptiles and free-ranging mammals. For aquatic organisms, Al bioavailability and toxicity are intimately related to ambient pH; changes in ambient acidity may affect Al solubility, dissolved Al speciation, and organism sensitivity to Al. At moderate acidity...
Authors
D. W. Sparling, T. P. Lowe, P.G.C. Campbell
Riverine resources: water needs and environmental effects analyses in the Alabama- Coosa- Tallapoosa and Apalachicola- Chattahoochee- Flint River basins Riverine resources: water needs and environmental effects analyses in the Alabama- Coosa- Tallapoosa and Apalachicola- Chattahoochee- Flint River basins
No abstract available.
Authors
Mary C. Freeman, J.M. Nestler, P.N. Johnson
Remarkable saker falcon (Falco cherrug) breeding records for Mongolia Remarkable saker falcon (Falco cherrug) breeding records for Mongolia
During 1994-95 surveys, we located over 80 Saker Falcon (Falco cherrug) breeding sites in Mongolia. Over half of the sites had features that were in some way remarkable or previously undescribed in the scientific literature. Ten were on utility poles, two on bridges, three on abandoned buildings and one was on a truck tire on a pole. Seven sites were very near buzzard nests and two more...
Authors
David H. Ellis, Merlin H. Ellis, Pu Tsengeg
Sources of variation in waterfowl survival rates Sources of variation in waterfowl survival rates
Because of the need to manage hunted populations of waterfowl (Anatidae), biologists have studied many demographic traits of waterfowl by analyzing band recoveries. These analyses have produced the most extensive and best estimates of survival available for any group of birds. Using these data, we examined several factors that might explain variation among annual survival rates to...
Authors
D.G. Krementz, R. J. Barker, J.D. Nichols
Metodos cuantitativas contemporancos para entender y manejar poblaciones y comunidades animales Metodos cuantitativas contemporancos para entender y manejar poblaciones y comunidades animales
No abstract available.
Authors
M.J. Conroy, J.D. Nichols, E.R. Asanza
Is incest common in gray wolf packs? Is incest common in gray wolf packs?
Wolf packs generally consist of a breeding pair and their maturing offspring that help provision and protect pack young. Because the reproductive tenure in wolves is often short, reproductively mature offspring might replace their parents, resulting in sibling or parent-offspring matings. To determine the extent of incestuous pairings, we measured relatedness based on variability in 20
Authors
Deborah E. Smith, Thomas J. Meier, Eli Geffen, L. David Mech, John W. Burch, Layne G. Adams, Robert K. Wayne
Population trends of black terns from the North American Breeding Bird Survey, 1966-1996 Population trends of black terns from the North American Breeding Bird Survey, 1966-1996
Data from the North American Breeding Bird Survey indicate a survey-wide decline in Black Terns (Chlidonias niger) at an average rate of 3.1% annually during 1966-1996. Black Terns in Canada decreased at an average annual rate of 3.5% during this interval, while the United States population showed no significant trends. The long-term declines largely reflect trends prior to 1980, when...
Authors
B.G. Peterjohn, J.R. Sauer