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Title: Interactions among benthic insects, algae, and bacteria in a geothermally influenced stream. [Helicopsyche borealis (Hagen)]

Abstract

This dissertation examines the interactions between benthic macroinvertebrates and microorganisms in stream habitats that were exposed to varying levels of geothermal contamination. Stream microcosms were used in situ to evaluate the separate effects of the thermal and chemical components of geothermal effluents on aquatic biota in Big Sulphur Creek, a third-order stream at the Geysers. The thermal component of those effluents had greater influence than the chemical component in determining benthic community structure. The effects of grazing by the herbivorous caddisfly Helicopsyche borealis (Hagen) on benthic algae and bacteria were experimentally studied in an undisturbed segment of Big Sulphur Creek. Exclusion of Helicopsyche larvae from introduced substrates resulted in high standing crops of algae and bacteria, but a low algal turnover rate. On substrate that was grazed by natural densities of Helicopsyche larvae, algal and bacterial standing crops were reduced by 83-98%, but the turnover rate of algae was substantially increased. Thus, grazing by Helicopsyche resulted in a low-biomass algal community that, because of a high turnover rate, was able to support a high biomass of consumers. These results emphasize the importance of consumer-producer interactions in stream ecosystems; disturbance of either component during geothermal development may result in substantial changesmore » at other trophic levels as well. Complementary studies to those summarized above include (1) comparison of introduced and natural substrates for sampling benthic organisms, (2) distributional analysis of benthic biota along a geothermal gradient, and (3) evaluation of seasonal dynamics of suspended microorganisms in three streams that have different geothermal characteristics. This dissertation concludes with a review of primary consumption patterns in aquatic insects.« less

Authors:
Publication Date:
Research Org.:
California Univ., Berkeley (USA)
OSTI Identifier:
5154295
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; AQUATIC ECOSYSTEMS; ECOLOGY; GEOTHERMAL POWER PLANTS; ENVIRONMENTAL EFFECTS; THERMAL EFFLUENTS; BIOLOGICAL EFFECTS; ALGAE; BENTHOS; EXPERIMENTAL DATA; GEYSERS GEOTHERMAL FIELD; INSECTS; MICROCOSMS; POPULATION DYNAMICS; STREAMS; TEMPERATURE EFFECTS; WATER POLLUTION; ANIMALS; AQUATIC ORGANISMS; ARTHROPODS; DATA; ECOSYSTEMS; GEOTHERMAL FIELDS; INFORMATION; INVERTEBRATES; NUMERICAL DATA; PLANTS; POLLUTION; POWER PLANTS; SURFACE WATERS; THERMAL POWER PLANTS; 150600* - Geothermal Energy- Environmental Aspects; 560202 - Thermal Effects- Microorganisms- (1987); 560204 - Thermal Effects- Invertebrates- (-1987)

Citation Formats

Lamberti, G A. Interactions among benthic insects, algae, and bacteria in a geothermally influenced stream. [Helicopsyche borealis (Hagen)]. United States: N. p., 1983. Web.
Lamberti, G A. Interactions among benthic insects, algae, and bacteria in a geothermally influenced stream. [Helicopsyche borealis (Hagen)]. United States.
Lamberti, G A. Sat . "Interactions among benthic insects, algae, and bacteria in a geothermally influenced stream. [Helicopsyche borealis (Hagen)]". United States.
@article{osti_5154295,
title = {Interactions among benthic insects, algae, and bacteria in a geothermally influenced stream. [Helicopsyche borealis (Hagen)]},
author = {Lamberti, G A},
abstractNote = {This dissertation examines the interactions between benthic macroinvertebrates and microorganisms in stream habitats that were exposed to varying levels of geothermal contamination. Stream microcosms were used in situ to evaluate the separate effects of the thermal and chemical components of geothermal effluents on aquatic biota in Big Sulphur Creek, a third-order stream at the Geysers. The thermal component of those effluents had greater influence than the chemical component in determining benthic community structure. The effects of grazing by the herbivorous caddisfly Helicopsyche borealis (Hagen) on benthic algae and bacteria were experimentally studied in an undisturbed segment of Big Sulphur Creek. Exclusion of Helicopsyche larvae from introduced substrates resulted in high standing crops of algae and bacteria, but a low algal turnover rate. On substrate that was grazed by natural densities of Helicopsyche larvae, algal and bacterial standing crops were reduced by 83-98%, but the turnover rate of algae was substantially increased. Thus, grazing by Helicopsyche resulted in a low-biomass algal community that, because of a high turnover rate, was able to support a high biomass of consumers. These results emphasize the importance of consumer-producer interactions in stream ecosystems; disturbance of either component during geothermal development may result in substantial changes at other trophic levels as well. Complementary studies to those summarized above include (1) comparison of introduced and natural substrates for sampling benthic organisms, (2) distributional analysis of benthic biota along a geothermal gradient, and (3) evaluation of seasonal dynamics of suspended microorganisms in three streams that have different geothermal characteristics. This dissertation concludes with a review of primary consumption patterns in aquatic insects.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

Thesis/Dissertation:
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