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Memorial University - Electronic Theses and Dissertations 3
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Document Description
TitleFree-living nematode assemblages in various environmentally impacted marine sites
AuthorLawlor, Jennifer Jean, 1975-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2001. Biology
Paginationxiv, 130, [2] leaves : ill. (some col.), maps
SubjectNematoda--Effect of water pollution on--Newfoundland and Labrador; Nematoda--Effect of oil spills on--Newfoundland and Labrador
Degree GrantorMemorial University of Newfoundland. Dept. of Biology
NotesBibliography: leaves 109-120
AbstractThis study considers the composition of nematode assemblages in marine sites receiving discharges from an oil refinery in Come-By-Chance, ones supporting aquaculture and ones that are affected by other forms of human activity in Bay d'Espoir. Changes in nematode population were recorded with respect to season, and in the case of the aquaculture sites comparisons were drawn with non-aquaculture locations. The Maturity Index was calculated together with the Shannon-Weaver, Simpson, Evenness and Species Richness Indices. A suite of environmental conditions (sediment size, temperature, depth, pH and redox potential) in the aquaculture sites was compared to that in non-aquaculture ones. -- The importance of integrating absolute numbers and genera collected, feeding type analysis, diversity indices, Evenness, Species Richness, Maturity Index (MI) and c-p analysis was indicated at both study locations. The utility of smaller samples or sub- samples of larger samples was demonstrated (Chapter 2), as was the importance of having a complete data set (Chapter 3). -- The identity of nematode communities have been established for these areas for the first time. Both sampled sites near the Come-By-Chance Oil Refinery had relatively high numbers of nematodes and many of the species have been previously associated with oil spills (Chapter 2). In comparison, the samples from Bay d'Espoir had relatively fewer nematodes and in general the aquaculture sites had even fewer nematodes per sample than the non-aquaculture sites in the same region. No nematodes were isolated from forty per cent of the aquaculture samples (Chapter 3). -- For the MI calculation fewer nematodes were required which need only be identified to family. That is, an entire sample need not be examined to yield statistically similar MI values. This gets results faster, leaving more time for a more comprehensive analysis. The advantages and disadvantages of all above mentioned indices are discussed (Chapter 4). -- In addition, there was one nematode that occurred several times in Bay d'Espoir samples that could not be identified to genus. The nematode belongs to the family Comesomatidae.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera1539389
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(14.29 MB) --
CONTENTdm file name91189.cpd