Filters: Tags: lizard (X)6 results (66ms)
These data depict reptile species richness within the range of the Greater Sage-grouse. Species boundaries were defined as the total extent of a species geographic limits. This raster largely used species range data from "U.S. Geological Survey - Gap Analysis Project Species Range Maps CONUS_2001", however in order for a more complete picture of species richness, additional sources were used for species missing from the Gap Analysis program.
Number of snake and lizard species, by terrestrial ecoregion. We compiled data on terrestrial lizards and snakes by querying the WWF WildFinder database for species occurrences by ecoregion of the following taxonomic groups: Sauria, Serpentes, Amphisbaenia, and Rhynchocephalia. The WWF WildFinder database is a spatially explicit online database of vertebrate species occurrences by ecoregion. These data were displayed in a map published in The Atlas of Global Conservation (Hoekstra et al., University of California Press, 2010). More information at http://nature.org/atlas.
The data set consists of 3 spreadsheets: counts, efforts, and location that detail the 10-year removal effort of invasive Veiled Chameleons (Chamaeleo calyptratus) on the island of Maui. Recorded are the number of lizards removed from each site, the level of search effort at each site, and the centroid location of each sampled site.
Linking precipitation and C3-C4 plant production to resource dynamics in higher-trophic-level consumers.
In many ecosystems, seasonal shifts in temperature and precipitation induce pulses of primary productivity that vary in phenology, abundance, and nutritional quality. Variation in these resource pulses could strongly influence community composition and ecosystem function, because these pervasive bottom-up forces play a primary role in determining the biomass, life cycles, and interactions of organisms across trophic levels. The focus of this research is to understand how consumers across trophic levels alter resource use and assimilation over seasonal and interannual timescales in response to climatically driven changes in pulses of primary productivity. We measured the carbon isotope ratios (delta(13)C) of plant,...
Environmental influences on the testis cycles of the lizards Dipsosaurus dorsalis and Xantusia vigilis
1. 1. Annual testis cycles in the lizards Dipsosaurus dorsalis and Xantusia vigilis are regulated by both exogenous, especially thermal, stimuli and an endogenous rhythmicity. 2. 2. High temperatures appear to be the primary cue for stimulating spermatogenesis and androgenesis in spring. 3. 3. Photoperiod affects X. vigilis in mid-winter (long days stimulate the testes), but only at high body temperatures, and photoperiodic sensitivity is lost by March. 4. 4. Testis regression appears to be essentially independent of photoperiod and temperature in both lizards, and an endogenous rhythm is postulated. 5. 5. A prolonged, post-nuptial, sexual refractory period accounts for the suppression of spermatogenic activity...