Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16731
Testing life history predictions in a long-lived seabird: A population matrix approach with improved parameter estimation Testing life history predictions in a long-lived seabird: A population matrix approach with improved parameter estimation
Life history theory and associated empirical generalizations predict that population growth rate (λ) in long-lived animals should be most sensitive to adult survival; the rates to which λ is most sensitive should be those with the smallest temporal variances; and stochastic environmental events should most affect the rates to which λ is least sensitive. To date, most analyses attempting...
Authors
P.F. Doherty, E.A. Schreiber, J.D. Nichols, J.E. Hines, W.A. Link, G.A. Schenk, R.W. Schreiber
Sex Determination of Carolina Wrens (Thryothorus ludovicianus) in the Mississippi Alluvial Valley Sex Determination of Carolina Wrens (Thryothorus ludovicianus) in the Mississippi Alluvial Valley
I identified sexual dimorphism in wing length (unflattened chord) of Carolina Wrens (Thryothorus ludovicianus) within the central Mississippi Alluvial Valley (northeast Louisiana and west-central Mississippi) and used this difference to assign a sex to captured wrens. Wrens were identified as female when wing length was less than 57.5 mm or male when wing length was greater than 58.5 mm.
Authors
D.J. Twedt
Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest
No abstract available.
Authors
D.K. Niven, J.R. Sauer, G.S. Butcher, W.A. Link
Stream salamanders as indicators of stream quality in Maryland, USA Stream salamanders as indicators of stream quality in Maryland, USA
Biological indicators are critical to the protection of small, headwater streams and the ecological values they provide. Maryland and other state monitoring programs have determined that fish indicators are ineffective in small streams, where stream salamanders may replace fish as top predators. Because of their life history, physiology, abundance, and ubiquity, stream salamanders are...
Authors
M.T. Southerland, R.E. Jung, D.P. Baxter, I.C. Chellman, G. Mercurio, J.H. Volstad
Estimation of sex-specific survival from capture-recapture data when sex is not always known Estimation of sex-specific survival from capture-recapture data when sex is not always known
Many animals lack obvious sexual dimorphism, making assignment of sex difficult even for observed or captured animals. For many such species it is possible to assign sex with certainty only at some occasions; for example, when they exhibit certain types of behavior. A common approach to handling this situation in capture-recapture studies has been to group capture histories into those of...
Authors
J.D. Nichols, W. L. Kendall, J.E. Hines, J. A. Spendelow
Evolution of quantitative methods for the study and management of avian populations: on the importance of individual contributions Evolution of quantitative methods for the study and management of avian populations: on the importance of individual contributions
The EURING meetings and the scientists who have attended them have contributed substantially to the growth of knowledge in the field of estimating parameters of animal populations. The contributions of David R. Anderson to process modeling, parameter estimation and decision analysis are briefly reviewed. Metrics are considered for assessing individual contributions to a field of inquiry...
Authors
J.D. Nichols
Computing and software Computing and software
The reality is that the statistical methods used for analysis of data depend upon the availability of software. Analysis of marked animal data is no different than the rest of the statistical field. The methods used for analysis are those that are available in reliable software packages. Thus, the critical importance of having reliable, up–to–date software available to biologists is...
Authors
Gary C. White, J.E. Hines
Reduced fecundity in small populations of the rare plant Gentianopsis ciliate (Gentianaceae) Reduced fecundity in small populations of the rare plant Gentianopsis ciliate (Gentianaceae)
Habitat destruction is the main cause for the biodiversity crisis. Surviving populations are often fragmented, i.e., small and isolated from each other. Reproduction of plants in small populations is often reduced, and this has been attributed to inbreeding depression, reduced attractiveness for pollinators, and reduced habitat quality in small populations. Here we present data on the...
Authors
M. Kery, D. Matthies
A guide to constructing and understanding synonymies for mammalian species A guide to constructing and understanding synonymies for mammalian species
No abstract available.
Authors
A. L. Gardner, V. Hayssen
Cryptotis meridensis Cryptotis meridensis
No abstract available.
Authors
N. Woodman, A. D’az de Pascual
Altitude and configuration of the potentiometric surface in West Fallowfield, Upper Oxford, and Lower Oxford Townships, Chester County, Pennsylvania, March through July 2002 Altitude and configuration of the potentiometric surface in West Fallowfield, Upper Oxford, and Lower Oxford Townships, Chester County, Pennsylvania, March through July 2002
No abstract available.
Authors
Abdul Mohammad
The first mangrove swallow recorded in the United States The first mangrove swallow recorded in the United States
No abstract available.
Authors
P.W. Sykes, L.S. Atherton, M. Gardler, J.H. V Hintermister