Distribution, abundance and biomass of benthic macroinvertebrate relative to pH and nutrients in nine lakes of Nova Scotia / Valerie Anne Schell.

By:

Schell, Valerie Anne

Material type: Text

TextSeries: Thesis. (M.Sc.)Publication details: Halifax, N.S. : Dalhousie University, 1989.Description: 129 leaves : ill., maps ; 28 cmISBN:

0315498234
9780315498235

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Dissertation note: Thesis (M.Sc.) -- Dalhousie University, 1989. Summary: The distribution, abundance and biomass of benthic macroinvertebrates were investigated in nine lakes, in Nova Scotia, May to July, 1987.Eight of the lakes range widely in pH (3.6 - 6.3), total phosphorus (3.3 - 39.8 mg/L) and calcium (0.35 - 6.3 mg/L) while Soldier Lake,Halifax County, has an internal pH range (4.9 - 6.8). Several macroinvertebrate groups, especially Pelecypoda, Hirudinea and Gastropoda apparently do not occur in lakes of low pH (5.0). The bivalve, Pisidium sp. occurred in one acidic lake at (pH 5.2) which is apparently the lowest pH occurrence at such a low calcium level (0.35 mg/L). Macroinvertebrate richness was reduced with increased levels of acidity but nutrient availability apparently controlled the macroinvertebrate abundance and biomass in the lakes.

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Electronic Report	Electronic Library	Non-fiction	SCH (Browse shelf(Opens below))	Available		5695

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"December 1988."

Thesis (M.Sc.) -- Dalhousie University, 1989.

Includes bibliographic references (leaves 118-129).

The distribution, abundance and biomass of benthic macroinvertebrates were investigated in nine lakes, in Nova Scotia, May to July, 1987.Eight of the lakes range widely in pH (3.6 - 6.3), total phosphorus (3.3 - 39.8 mg/L) and calcium (0.35 - 6.3 mg/L) while Soldier Lake,Halifax County, has an internal pH range (4.9 - 6.8). Several macroinvertebrate groups, especially Pelecypoda, Hirudinea and Gastropoda apparently do not occur in lakes of low pH (5.0). The bivalve, Pisidium sp. occurred in one acidic lake at (pH 5.2) which is apparently the lowest pH occurrence at such a low calcium level (0.35 mg/L). Macroinvertebrate richness was reduced with increased levels of acidity but nutrient availability apparently controlled the macroinvertebrate abundance and biomass in the lakes.

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