The butterfly fauna of Barton Creek Canyon on the Balcones Fault Zone, Austin, Texas, and a regional list.By Durden, C.J.
Durden, C.J. 1982. The butterfly fauna of Barton Creek Canyon on the Balcones Fault Zone, Austin, Texas, and a regional list. Journal of the Lepidopterists' Society 36(1): 1-17.
ABSTRACT. Diversity of substrate, topography and water supply, and climate and vegetation account for the occurrence of 74% of the regional fauna along a 1.1 km stretch of Barton Creek. Monthly mean weather records for 40 years are analyzed on a bioclimagram and the modes matched with habitat types. 172 species are listed for the ten counties around Austin, and range, habitat, abundance, and residency are indicated for the 127 found at the study site. Faunal history is interpreted as a sequence of colonization events followed by episodes of habitat restriction. These are related to regional patterns of climatic change inferred from the 22,000-year paleontologic record of sphagnum bogs 70 km to the east and southeast. No species listed is endangered by collecting. Several restricted species of special habitats are threatened by potentially careless land use.