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Memorial University - Electronic Theses and Dissertations 2
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TitleNumerical, growth and secondary production responses of the benthic macroinvertebrate community to whole-lake enrichment in insular Newfoundland
AuthorClarke, Keith, 1969-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 1995. Biology
Paginationxiii, 111 leaves : ill., graphs.
SubjectBenthos--Newfoundland and Labrador; Freshwater invertebrates--Newfoundland and Labrador; Lake animals--Newfoundland and Labrador; Lakes--Newfoundland and Labrador--Fertilization
Degree GrantorMemorial University of Newfoundland. Dept. of Biology
Spatial CoverageCanada--Newfoundland and Labrador
NotesBibliography: leaves 89-95.
AbstractA 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.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier76245844
RightsThe 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.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(13.04 MB) --
CONTENTdm file name70693.cpd