Publications
These publications showcase the significant science conducted in our Science Centers.
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Identification and distribution of cotton rats, genus Sigmodon (Muridae: Sigmodontinae), of Nayarit, M?xico Identification and distribution of cotton rats, genus Sigmodon (Muridae: Sigmodontinae), of Nayarit, M?xico
Morphological, chromosomal, distributional, and ecological data are presented for three species of Sigmodon (S. alleni, S. arizonae, and S. mascotensis) from the state of Nayarit, Mexico. The species were collected in all possible pairwise combinations of sympatry, including the first record of such documented for S. arizonae and S. mascotensis. Emphasis is devoted to the discrimination...
Authors
M.D. Carleton, R.D. Fisher, A. L. Gardner
Lead exposure in passerines inhabiting lead-contaminated floodplains in the Coeur d'Alene River Basin, Idaho, USA Lead exposure in passerines inhabiting lead-contaminated floodplains in the Coeur d'Alene River Basin, Idaho, USA
Blood collected from song sparrows (Melospiza melodia) and American robins (Turdus migratorius) captured with mist nets in a lead-contaminated (assessment) area and nearby uncontaminated (reference) areas within the Coeur d'Alene Basin in northern Idaho was analyzed for δ-aminolevulinic acid dehydratase activity (ALAD) and hematocrit levels, and livers were analyzed for lead. Mean ALAD...
Authors
G.D. Johnson, D. J. Audet, John W. Kern, L. J. LeCaptain, M.D. Strickland, D. J. Hoffman, L.L. McDonald
Development and application of a mark-recapture model incorporating predicted sex and transitory behaviour Development and application of a mark-recapture model incorporating predicted sex and transitory behaviour
We developed an extension of Cormack-Jolly-Seber models to handle a complex mark-recapture problem in which (a) the sex of birds cannot be determined prior to first moult, but can be predicted on the basis of body measurements, and (b) a significant portion of captured birds appear to be transients (i.e. are captured once but leave the area or otherwise become ' untrappable'). We applied...
Authors
M.J. Conroy, J.C. Senar, J.E. Hines, J. Domenech
Does nonrandom nest placement imply nonrandom nest predation?: A reply Does nonrandom nest placement imply nonrandom nest predation?: A reply
In response to the critique by Schmidt and Whelan (Condor 101(4):916-920, 1999), we find that the relationship between nest success and tree selectivity is dependent upon inclusion or exclusion of particular tree species, whether or not years are pooled, and the selectivity index used. We question their use of point estimates of nest success with extremely high variances, defend our...
Authors
R.J. Cooper, R.R. Wilson, G.D. Zenitsky, S.J. Mullin, J.D. Dececco, M.R. Marshall, D.J. Wolf, Lars Y. Pomara
Effects of landscape composition and wetland fragmentation on frog and toad abundance and species richness in Iowa and Wisconsin, USA Effects of landscape composition and wetland fragmentation on frog and toad abundance and species richness in Iowa and Wisconsin, USA
Management of amphibian populations to reverse recent declines will require defining high-quality habitat for individual species or groups of species, followed by efforts to retain or restore these habitats on the landscape. We examined landscape-level habitat relationships for frogs and toads by measuring associations between relative abundance and species richness based on survey data...
Authors
M. G. Knutson, J.R. Sauer, D.A. Olsen, M.J. Mossman, L.M. Hemesath, M.J. Lannoo
Impact of forest type and management strategy on avian densities in the Mississippi Alluvial Valley, USA Impact of forest type and management strategy on avian densities in the Mississippi Alluvial Valley, USA
Avian territory densities were determined from 20 Breeding Bird Censuses in mature (>30 years) bottomland hardwood stand: and 18 Breeding Bird Censuses in young (6-9 years old) cottonwood (Populas deltoides) plantations in the Mississippi Alluvial Valley. Avian species richness, diversity, and territory density were greater (p 0.01) in bottomland hardwood stands than in intensively...
Authors
D.J. Twedt, R.R. Wilson, J. L. Henne-Kerr, R.B. Hamilton
Contaminant exposure and effects database for wild terrestrial vertebrates: A source for information on endocrine disrupting chemicals Contaminant exposure and effects database for wild terrestrial vertebrates: A source for information on endocrine disrupting chemicals
No abstract available.
Authors
N. H. Golden, M. A. Ottinger, Barnett A. Rattner, J.B. Cohen, L.M. Loges, R.M. Erwin
Abundance and reproduction of songbirds in burned and unburned pine forests of the Georgia Piedmont Abundance and reproduction of songbirds in burned and unburned pine forests of the Georgia Piedmont
We studied the abundance and productivity of songbirds in prescribed burned and unburned mature (>60 yr) pine forests at Piedmont National Wildlife Refuge, Georgia, during 1993-1995. We estimated species abundance, richness, and evenness using data from 312 point counts in 18 burned sites and six unburned sites. We measured gross habitat features in 0.04-ha circles centered on each point...
Authors
Donald H. White, B.R. Chapman, J.H. Brunjes, R.V. Raftovich, J.T. Seginak
Introduction Introduction
No abstract available.
Authors
M.L. Morrison, L.S. Hall, S.K. Robinson, S.I. Rothstein, D.C. Hahn, T.D. Rich
Vocalization behavior and response of black rails Vocalization behavior and response of black rails
We measured the vocal responses and movements of radio-tagged black rails (Laterallus jamaicensis) (n = 43, 26 males, 17 females) to playback of vocalizations at 2 sites in Florida during the breeding seasons of 1992-95. We used regression coefficients from logistic regression equations to model the probability of a response conditional to the birds' sex, nesting status, distance to...
Authors
M.L. Legare, W.R. Eddleman, P. A. Buckley, C. Kelly
Status of the Texas Botteri Sparrow Status of the Texas Botteri Sparrow
No abstract available.
Authors
J.T. Marshall, R. B. Clapp
The Okefenokee Swamp: Invertebrate communities and foodwebs The Okefenokee Swamp: Invertebrate communities and foodwebs
No abstract available.
Authors
K.G. Porter, A. Bergstedt, Mary C. Freeman