15 Matching Results

Search Results

Advanced search parameters have been applied.

Thermal-nutritional regulation of functional groups in running water ecosystems. Technical progress report, October 1, 1978-November 1, 1980

Description: The research encompassed three general areas: (1) characterization of stream macroinvertebrate functional feeding groups (shredders, collectors, scrapers, and predators) based on morphological and behavioral adaptations and food-source-specific growth responses of selected species; (2) demonstration of the relative importance of temperature and food quality (in which maximum quality is defined as that producing the most growth) in controlling growth rate and survivorship of stream functional groups; and (3) derivation and refinement of conceptual and quantitative models of stream ecosystem structure and function, with particular emphasis on detrital processing. Verification of the functional group concept as a tool for assessing and predicting is reflected in alterations of the relative dominance of various functional groups. Food quality can strongly influence the growth rates of shredders, collectors and scrapers and override the effects of temperature in a number of cases. Gathering collectors may select food particles by size (or at least be restricted to a limited portion of the total range available) but representative species do not appear to select for quality.
Date: November 1, 1980
Creator: Cummins, K.W.
Partner: UNT Libraries Government Documents Department

Thermal regulation of functional groups in running water ecosystems. Progress report, October 1, 1975--June 30, 1976

Description: Progress is reported on the following research projects: characterization of functional groups of running water organisms, particularly macroconsumers; studies on relationship of functional groups to qualitative and quantitative characteristics of organic inputs to stream ecosystems; studies on relationship of functional groups to thermal regimes; and dimensioning the control of feeding and growth by temperature and food quality and quantity and determining the extent of compensatory action of each. (HLW)
Date: July 1, 1976
Creator: Cummins, K. W. & Klug, M. J.
Partner: UNT Libraries Government Documents Department

Thermal regulation of functional groups in running water ecosystems Technical progress report, October 1, 1976--June 30, 1977

Description: The research plan encompassed three general objectives: derivation of generalized models of detrital processing in stream ecosystems with special emphasis on thermal control; characterization of functional groups of running water organisms, particularly macroinvertebrates (shredders, collectors, scrapers, piercers, predators); and demonstration of the importance of food quality, and the interaction between temperature and food quality, in controlling growth and survivorship of stream functional groups.
Date: July 1, 1977
Creator: Cummins, K. W. & Klug, M. J.
Partner: UNT Libraries Government Documents Department