Numerical, growth and secondary production responses of the benthic macroinvertebrate community to whole-lake enrichment in insular Newfoundland

Clarke, Keith (1995) Numerical, growth and secondary production responses of the benthic macroinvertebrate community to whole-lake enrichment in insular Newfoundland. Masters thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
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Abstract

A whole-lake enrichment (N + P) experiment was conducted over a three-year period to evaluate the feasibility of boosting benthic productivity in insular Newfoundland lakes. Response of the benthic community to enrichment was monitored by a combination of biomonitoring (artificial substrate) and quantitative dredge sampling in both the enriched lake and two control lakes. -- Observations of benthic abundance through biomonitoring approaches revealed a continuum of positive numerical responses to enrichment. Responses were most rapid in short-lived herbivores such as chironomids, gastropods and sphaeriid clams while longer-lived detritivores (mayflies, amphipods) and predators (flatworms, leeches and dragonflies) demonstrated a slower, more modest numerical response. The benthic macroinvertebrate communities of the study lakes were composed of cosmopolitan species from the North American fauna in relatively low densities. Benthic biomass was dominated by gastropoda and the odonate Cordulia. Secondary production estimates were relatively low when compared to mainland systems. Short-lived herbivores (Amnicola, Phryganea) were observed to have increased secondary production in the enriched pond. Secondary production estimates were similar in the three study ponds for the other macroinvertebrate taxa. Some of these taxa were observed to have increased growth (Cordulia) and/or recruitment (Enallagma) late in the study. This pattern indicates that benthic macroinvertebrate community production was still increasing in the enriched pond.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/4116
Item ID: 4116
Additional Information: Bibliography: leaves 89-95.
Department(s): Science, Faculty of > Biology
Date: 1995
Date Type: Submission
Geographic Location: Canada--Newfoundland and Labrador
Library of Congress Subject Heading: Benthos--Newfoundland and Labrador; Freshwater invertebrates--Newfoundland and Labrador; Lake animals--Newfoundland and Labrador; Lakes--Newfoundland and Labrador--Fertilization

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