Age Structure Alteration in a Caddisfly Population after Habitat Loss and Recovery
- 1 May 1982
- Vol. 38 (3) , 280-284
- https://doi.org/10.2307/3544665
Abstract
Monthly collections (1975-1976) from a sericostomatid caddisfly population, G. nigricula (McL.), in a northern California (USA) spring seepage indicated that age structure was numerically dominated by early larval instars (55-82% each month) but pupae (< 1-6%) were also present year-round. Severe drought in 1977 resulted in cessation of the normally permanent spring flow and total habitat loss occurred for over 3 mo., no G. nigricula apparently survived. Two years after habitat recovery (1979), a single cohort population with a clear temporal succession in age class dominance from early to late larval instars was evident. Temporally-restricted aerial recolonization of G. nigricula adults from a non-drought affected habitat most likely produced the shift to a single cohort population which has persisted through 2 generations (i.e., 2 yr).This publication has 1 reference indexed in Scilit:
- The Passive Dispersal of Small Aquatic Organisms and Their Colonization of Isolated Bodies of WaterEcological Monographs, 1963