Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16733
Evidence from tooth surface morphology for a posterior maxillary origin of the proteroglyph fang Evidence from tooth surface morphology for a posterior maxillary origin of the proteroglyph fang
Although the front-fanged venom delivery system of the Elapidae is believed to be derived from an aglyphous or opisthoglyphous colubroid ancestor, opinion is divided as to the end of the maxilla on which the proteroglyph fang originated. This study was undertaken to determine whether the evolutionary precursor of the proteroglyph fang was (a) a grooved posterior fang which migrated...
Authors
Thomas H. Fritts, K. Jackson
Managing and monitoring birds using point counts: Standards and applications Managing and monitoring birds using point counts: Standards and applications
No abstract available.
Authors
C.J. Ralph, Sam Droege, J.R. Sauer
Breeding bird survey: Population trends 1966-92 Breeding bird survey: Population trends 1966-92
The North American Breeding Bird Survey (BBS) was begun in 1966 to collect standardized data on bird populations along more than 3,400 survey routes across the continental United States and southern Canada. The BBS has been used to document distributions and establish continental, regional, and local population trends for more than 250 species. We summarize here survey-wide patterns in...
Authors
Bruce G. Peterjohn, John R. Sauer, Sandra Orsillo
Population modeling and its role in toxicological studies Population modeling and its role in toxicological studies
A model could be defined as any abstraction from reality that is used to provide some insight into the real system. In this discussion, we will use a more specific definition that a model is a set of rules or assumptions, expressed as mathematical equations, that describe how animals survive and reproduce, including the external factors that affect these characteristics. A model...
Authors
John R. Sauer, Grey W. Pendleton
Introduction Introduction
No abstract available.
Authors
D. J. Hoffman, Barnett A. Rattner, G.A. Burton, J. Cairns
Wolves and caribou in Denali National Park, Alaska Wolves and caribou in Denali National Park, Alaska
Management of gray wolves (Canis lupus) and their prey in interior Alaska has been controversial for three decades (Harbo and Dean 1983). Recently, debate was rekindled with renewed interest in wolf control to bolster two populations of caribou (Rangifer tarandus). Our research in Denali National Park provides insights into the declines in caribou numbers over the last few years that are...
Authors
Layne G. Adams, L. David Mech
Colony differences in response to trapping in roseate terns Colony differences in response to trapping in roseate terns
Both members of seabird pairs are normally required to fledge young. Seabirds that nest in sites accessible to predators usually have one parent in attendance during the egg/chick phase. Time devoted to foraging can vary with individual skill and age, prey availability and abundance (Seamy 1978), and distance to foraging grounds (Safina 1990). Although average skill of similar-aged...
Authors
J. Burger, I.C.T. Nisbet, James M. Zingo, J. A. Spendelow, C. Safina, M. Gochfeld
Reliability of the Breeding Bird Survey: Effects of restricting surveys to roads Reliability of the Breeding Bird Survey: Effects of restricting surveys to roads
Breeding Bird Surveys (BBS), which are widely used to monitor trends in avian populations (e.g. Robbins et al. 1989, Sauer and Droege 1993), are conducted along roads but are used to infer changes in regionwide populations. Such inferences may be inaccurate if trends in habitat along roads differ from regionwide trends. For example, if forest cover regionwide remained constant but forest...
Authors
J. Bart, M. Hofschen, B.G. Peterjohn
Accumulation in and effects of lead and cadmium on waterfowl and passerines in northern Idaho Accumulation in and effects of lead and cadmium on waterfowl and passerines in northern Idaho
Waterfowl and passerines in northern Idaho in 1987 had high levels of lead in their blood and tissues that originated primarily from mining and smelting activities. Four Canada geese (Branta canadensis) and one common goldeneye (Bucephala clangula) found dead contained 8 to 38 μg/g (wet mass) of lead in their livers. These levels exceed the lower lethal limit of 5 μg/g in experimental...
Authors
L. J. Blus, Charles J. Henny, D. J. Hoffman, R. A. Grove
Third specimen of Nuttall's woodpecker (Picoides nuttallii) in Oregon from Jackson County and comments on earlier records Third specimen of Nuttall's woodpecker (Picoides nuttallii) in Oregon from Jackson County and comments on earlier records
No abstract available.
Authors
M.R. Browning, S.P. Cross
Point count length and detection of forest neotropical migrant birds Point count length and detection of forest neotropical migrant birds
Comparisons of bird abundances among years or among habitats assume that the rates at which birds are detected and counted are constant within species. We use point count data collected in forests of the Mid-Atlantic states to estimate detection probabilities for Neotropical migrant bird species as a function of count length. For some species, significant differences existed among years...
Authors
D.K. Dawson, D. R. Smith, C.S. Robbins
Standard test methods for measuring the toxicity and bioaccumulation of sediment-associated contaminants, ASTM E1706-95a Standard test methods for measuring the toxicity and bioaccumulation of sediment-associated contaminants, ASTM E1706-95a
No abstract available.
Authors
C.G. Ingersoll, F.J. Dwyer, P. V. Winger, G.A. Burton, G.T. Ankley, T. J. Norberg-King, R.A. Hoke, D. Bedard, K. Day, P. Landrum