GEOSCAN Search Results: Fastlink


TitleRemotely sensed habitat diversity predicts butterfly species richness and community similarity in Canada
DownloadDownloads (Preprint)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKerr, J T; Southwood, T R E; Cihlar, J
SourcePNAS (Proceedings fot the National Academy of Sciences of the United States of America); 98, 20, 2001 p. 11365-11370, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20043084
Mediapaper; on-line; digital
File formatpdf
Released2001 01 01
AbstractAlthough there is no shortage of potential explanations for the large-scale patterns of biological diversity, the hypothesis that energy-related factors are the primary determinants is perhaps most extensively supported, especially in cold-temperate regions. By using unusually high-resolution biodiversity and environmental data that have not previously been available, we demonstrate that habitat heterogeneity, as measured by remotely sensed land cover variation, explains Canadian butterfly richness better than any energy-related variable we measured across spatial scales. Although species-richness predictability declines with progressively smaller quadrat sizes, as expected, we demonstrate that most variability (>90%) in butterfly richness may be explained by habitat heterogeneity with secondary contributions from climatic energy. We also find that patterns of community similarity across Canada are strongly related to patterns of habitat composition but not to differences in energy-related factors. Energy should still be considered significant but its main role may be through its effects on within-habitat diversity and perhaps, indirectly, on the sorts of habitats that may be found in a region. Effects of sampling intensity and spatial autocorrelation do not alter our findings.

Date modified: