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LIFE HISTORIES OF COEXISTING SPECIES OF CERACLEA CADDISFLIES (TRICHOPTERA: LEPTOCERIDAE): THE OPERATION OF INDEPENDENT FUNCTIONAL UNITS IN A STREAM ECOSYSTEM1

Published online by Cambridge University Press:  31 May 2012

Vincent H. Resh
Vincent H. Resh
Affiliation:
Water Resources Laboratory, University of Louisville, Louisville, Kentucky
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Abstract

Bionomics of the stream caddisflies, Ceraclea transversa (Hagen) (= Athripsodes angustus Banks) and Ceraclea ancylus (Vorhies) (= Athripsodes ancylus (Vorhies)) were compared with generalized trichopteran life cycles. The univoltine detritus-feeding C. ancylus has five larval instars and a brief adult emergence period. C. transversa has five larval instars but two distinct cohorts, in which larvae of the first cohort feed entirely on freshwater sponge, overwinter as inactive prepupae, pupate, and emerge the following spring. The second larval cohort feeds on sponge until the onset of gemmulation in autumn, then the larvae must overwinter as active third- or fourth-instar detritus-feeders, pupating and emerging later in the summer than the first cohort. The detritus-feeding C. ancylus larvae have a diurnal feeding cycle. The sand case of C. ancylus and the silk-secreted case of C. transversa differ in shape and composition, although both species initiate case construction using egg mass matrix, silk, and detritus. Emergence, flight activity, sex ratios, and adult survival depart from reported generalizations of caddisfly biology. Neither the validity of generalizing typical life cycles in benthic studies, nor the rationale that congeneric species operate as a functional unit in stream dynamics, is substantiated.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 12 , December 1976 , pp. 1303 - 1318
Copyright
Copyright © Entomological Society of Canada 1976

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