Thermal-Nutritional Regulation of Functional Groups in Running Water Ecosystems: Informal Technical Progress Report, Year 2, Jan. 1, 1986-Sept. 30, 1986

摘要

Progress for the period January 1, 1986 through September 10, 1986 is summarized. The major emphasis continued to be on the interaction between food quality and growth of representatives of the shredder, collector and scraper functional groups. However, extensive effort also was directed toward aspects of invertebrate mortality in a range of pilot studies during the project period. Three procedures were developed for separating populations of stream macroinvertebrates into groups of individuals which exhibit differential mortality. Initial analyses of stream invertebrate tissue have revealed the presence of pathogens. About 3% of the 425 larvae examined had heavy pathogen loads. This level of infection is approximately that predicted to produce the low mortality observed in natural populations dominated by later instar individuals. (ERA citation 12:008595)