The distribution and habitat separation of three corixids (Hemiptera: Heteroptera) in western Colorado

Abstract

SummaryThree species of Corixidae (Hemiptera : Heteroptera) were studied in thirty montane, sub‐alpine, and alpine ponds in Western Colorado. Callicorixa audeni Hung, had the widest altitudinal range (2800‐3400 m). Cenocorixa bifida Hung, was most common in montane ponds. Arctocorisa lawsoni Hung, was found only above 3100 m. C. audeni was significantly associated with C. bifida and A. lawsoni. Habitat selection was studied in two montane (2900 m) and one alpine (3480 m) pond. C. audeni utilized both mud and emergent sedges as perching and feeding sites, occurring more frequently in the sedges in the montane ponds. C. bifida was confined to the mud. In the alpine pond, A. lawsoni was most abundant on the mud; C. audeni occurred equally on the mud and in the sedges. All three species preferred shallow water (less than 0·5 m). A. lawsoni occupied deeper water more often than C. audeni. In substrate selection experiments C. audeni occupied emergent sedges more than C. bifida, confirming field observations. C. bifida occurred in sedges in the aquaria, but not in the montane ponds, suggesting that an interspecific interaction may be excluding C. bifida from the sedges in nature.

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