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Now showing items 21-30 of 41
A geography of extinction: Patterns in the contraction of geographic ranges.
(1998)
I examined the contraction of geographic ranges in 245 species. Remnant portions of the geographic range tended to persist in the periphery of the species' historical range. Larger patches of the geographic ranges persisted ...
The ecology of the exotic cladoceran zooplankton, Daphnia lumholtzi (Sars), in Lake Texoma, Oklahoma - Texas.
(1997)
In Chapter 1, I present the initial data on the distribution and abundance of Daphnia lumholtzi during the summer of 1993. Lake Texoma has variable and often strong horizontal gradients in temperature, conductivity, and ...
Comparative physiology and macroecology of thermal tolerance in ectothermic vertebrates with correlates of phylogeny and biogeography.
(1997)
An organism's distribution and geographic range result from physiological tolerances and its ability to adjust physiological processes to maximize survival, growth, and reproduction under a diversity of environmental factors ...
Iguanid mating systems: Ecological causes and sexual selection consequences.
(1997)
Ctenosaura similis females exhibited extremely overlapping home ranges near burrow sites; D. dorsalis females exhibited moderate levels of home range overlap beneath large shrubs offering cool temperatures. Males of both ...
Structure and assembly of avian communities associated with black-tailed prairie dog ecosystems.
(2007)
It is clear that even in their current remnant state, black-tailed prairie dogs continue to play a significant role in the assembly of ecological communities across the Great Plains. Conservation of prairie dogs goes well ...
A multiscale analysis of nest-site choice, nest success, and population abundance in the scissor-tailed flycatcher (Tyrannus forficatus).
(2000)
I used BBS data and habitat maps to examine associations of landscape structure and composition with the relative mean abundance of the scissor-tailed flycatcher. Routes were scattered over most of the breeding range. ...
Landscape heterogeneity and the role of corridors in determining the spatial structure of insular mammal populations.
(1998)
Characterizing the influence of landscape features on assessments of isolation is critical to understanding dispersal, and, ultimately, the structure of native communities in fragmented ecosystems. At the same time, a ...
Genetic studies in a demographic framework: Annual variation, inbreeding history, and effects of isolation in a rare group of amphibians.
(2004)
Rana sevosa had significantly lower genetic variation than non-isolated populations of its sister taxa. In fact, the isolated population had an observed heterozygosity that was 72% and allelic richness that was 61% of the ...
Movement by three stream dwelling cyprinids (Notropis boops, Campostoma anomalum, and Cyprinella venusta).
(1999)
The effects of riffles as barriers to movement of stream fish were investigated in large, outdoor artificial streams. Rates of movement of three species of minnows (Cyprinidae) (Campostoma anomalum, Cyprinella venusta and ...
Nutrient availability and the structure and function of brown food webs
(2013-11-25)
Understanding individual nutritional requirements can generate good predictions for how communities should be structured and how ecosystems function over gradients of nutrient availability. Aboveground consumers can shape ...