Graduate Thesis Or Dissertation

 

Colonization and development of macroinvertebrate communities in laboratory streams Public Deposited

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  • Laboratory stream communities in simulated old growth second order streams were sampled June 1984 and June 1985 to advance an understanding of their organization and development, and their response to an environmental perturbance, the toxicant dieldrin. An interpenetrating hierarchical view of habitats and community subsystems was taken to conceptualize community organization. Major habitats defined major community subsystems and microhabitats defined sdbcommunity subsystems. Community development was influenced by colonization from a species pool and habitat development. Four colonizing strategies were observed including High Potential, Pulse, Tricklers and Intermittent colonizers. Seventy-four percent of the community biomass for all stream samples was composed of High Potential taxa. Riffle habitats contained the highest biomass and taxa diversity, and the Rapid habitat contained the lowest biomass and taxa diversity. Trophic organization changed with time, was different in the toxicant treated stream and was unique to each microhabitat. Fine-particle detritivores were the most ubiquitous trophic group. Microphyte herbivores greatly decreased in 1985 from 1984 levels. Community differences in the toxicant treated stream included lower biomass, fewer microphyte herbivores, lower taxa diversity, a greater number of fine-particle detritivores and a smaller range of habitat utilization. Percentage similarity of subconimunities at both the major and microhabitat organizational levels found the 1985 control stream to contain the most distinct subcommunities. Habitat associations and trophic feeding habits provided the basis for a life history classification of the community taxa consisting of Habitat Generalists, Backwater and Slow Current organisms and Rheophiles.
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