Life Histories of Selected Caddisflies (Trichoptera) in an Ozark Stream, U.S.A.
Abstract
Life histories for Agapetus illini, Chimarra aterrima, C. obscura, Helicopsyche limnella, Polycentropus centralis, Wormaldia moesta, and Cheumatopsyche spp. were estimated by determining the seasonal occurrence and relative abundance of larval instars and pupae and from adult collections. Head capsule width measurements revealed that all species studied had five larval instars. Agapetus illini and W. moesta were univoltine, but bivoltine life histories with overlapping generations were observed for C. aterrima, C. obscura, H. Limnella, and P. centralis. Although four species of Cheumatopsyche were recognized in adult collections, immature stages were not differentiated. When considered at the generic level, Cheumatopsyche appears to be bivoltine, and data suggest that all four species are likely bivoltine. Adults of bivoltine species (A. illini and W. moesta) were collected only during May. For the bivoltine species, larval recruitment from reproduction occurs throughout the adult flight period. Bivoltinism appears to be a common life-history pattern in warm water streams of southern latitudes in North America.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1990
- Accession Number
- ADA223548
Entities
People
- David E. Bowles
- Robert T. Allen
Organizations
- United States Air Force School of Aerospace Medicine