Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades
Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology Includes bibliographical references I examine the patterns of variation in the larval fish community from coastal Newfoundland using data from 68 surveys conducted during the summer months between 1982 and 2002. I review the literatu...
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ftmemorialunivdc:oai:collections.mun.ca:theses4/92932 2023-05-15T17:23:34+02:00 Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades Carter-Lynn, Kelly P. (Kelly Patricia). Memorial University of Newfoundland. Dept. of Biology Canada--Newfoundland and Labrador; 2009 xiv, 153 leaves : ill., maps. (chiefly col.) Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses4/id/92932 Eng eng Electronic Theses and Dissertations (16.65 MB) -- http://collections.mun.ca/PDFs/theses/Carter-Lynn_KellyP.pdf a3242421 http://collections.mun.ca/cdm/ref/collection/theses4/id/92932 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. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Fish communities--Newfoundland and Labrador Fishes--Larvae--Effect of temperature on--Newfoundland and Labrador Fishes--Larvae--Newfoundland and Labrador Fishes--Variation--Newfoundland and Labrador Text Electronic thesis or dissertation 2009 ftmemorialunivdc 2015-08-06T19:22:11Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology Includes bibliographical references I examine the patterns of variation in the larval fish community from coastal Newfoundland using data from 68 surveys conducted during the summer months between 1982 and 2002. I review the literature concerning changes in the adult fish community that have taken place, and then review the hypotheses about their possible causes. The principle debate surrounding the collapse of the Newfoundland groundfish deals with the relative roles of fishing pressure versus the potential influence of seawater temperature during the years following peak fishing pressure in the 1960's. I address whether differences in gear type (Bongo vs. Ring nets) might affect my ability to detect changes in the larval fish community as a result of selection loss or avoidance. Based on the results of statistical comparisons and on calculated catch ratios of < 1.61 concluded that no consistent bias was present as a result of gear type and that the abundance data in this study are sufficiently comparable for use in larger temporal studies. I then contrast temporal changes in the larval community of three bays. Based on Multidimensional Scaling plots, Group Average Cluster Analysis and species abundance plots, I concluded that temperature (seasonal structure) plays a role in determining community composition of the larval fish studied, producing distinct larval assemblages at specific times of the year. I also concluded that below average water temperatures during the early 1990's affected the community composition of the larva; as cold-water species were unusually present during summer months. Additionally Analysis of Similarity showed that larval species abundance significantly decreased post 1992 and some non-commercial species showed smaller declines in abundance than those commercially targeted. Finally, I examine the scale at which these changes have occurred, to determine whether large-scale temporal changes occur in species diversity or dominance, and whether changes correlate within and among the bays surrounding Newfoundland's Avalon Peninsula. Larval fish abundance displayed significant changes during the same time periods in all the bays examined in this study. However, further investigation is needed before conclusions can be made regarding how species composition differs in the bays surrounding the Avalon Peninsula. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Newfoundland Canada |
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Open Polar |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Fish communities--Newfoundland and Labrador Fishes--Larvae--Effect of temperature on--Newfoundland and Labrador Fishes--Larvae--Newfoundland and Labrador Fishes--Variation--Newfoundland and Labrador |
spellingShingle |
Fish communities--Newfoundland and Labrador Fishes--Larvae--Effect of temperature on--Newfoundland and Labrador Fishes--Larvae--Newfoundland and Labrador Fishes--Variation--Newfoundland and Labrador Carter-Lynn, Kelly P. (Kelly Patricia). Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades |
topic_facet |
Fish communities--Newfoundland and Labrador Fishes--Larvae--Effect of temperature on--Newfoundland and Labrador Fishes--Larvae--Newfoundland and Labrador Fishes--Variation--Newfoundland and Labrador |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology Includes bibliographical references I examine the patterns of variation in the larval fish community from coastal Newfoundland using data from 68 surveys conducted during the summer months between 1982 and 2002. I review the literature concerning changes in the adult fish community that have taken place, and then review the hypotheses about their possible causes. The principle debate surrounding the collapse of the Newfoundland groundfish deals with the relative roles of fishing pressure versus the potential influence of seawater temperature during the years following peak fishing pressure in the 1960's. I address whether differences in gear type (Bongo vs. Ring nets) might affect my ability to detect changes in the larval fish community as a result of selection loss or avoidance. Based on the results of statistical comparisons and on calculated catch ratios of < 1.61 concluded that no consistent bias was present as a result of gear type and that the abundance data in this study are sufficiently comparable for use in larger temporal studies. I then contrast temporal changes in the larval community of three bays. Based on Multidimensional Scaling plots, Group Average Cluster Analysis and species abundance plots, I concluded that temperature (seasonal structure) plays a role in determining community composition of the larval fish studied, producing distinct larval assemblages at specific times of the year. I also concluded that below average water temperatures during the early 1990's affected the community composition of the larva; as cold-water species were unusually present during summer months. Additionally Analysis of Similarity showed that larval species abundance significantly decreased post 1992 and some non-commercial species showed smaller declines in abundance than those commercially targeted. Finally, I examine the scale at which these changes have occurred, to determine whether large-scale temporal changes occur in species diversity or dominance, and whether changes correlate within and among the bays surrounding Newfoundland's Avalon Peninsula. Larval fish abundance displayed significant changes during the same time periods in all the bays examined in this study. However, further investigation is needed before conclusions can be made regarding how species composition differs in the bays surrounding the Avalon Peninsula. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
Carter-Lynn, Kelly P. (Kelly Patricia). |
author_facet |
Carter-Lynn, Kelly P. (Kelly Patricia). |
author_sort |
Carter-Lynn, Kelly P. (Kelly Patricia). |
title |
Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades |
title_short |
Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades |
title_full |
Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades |
title_fullStr |
Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades |
title_full_unstemmed |
Temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal Newfoundland over two decades |
title_sort |
temporal and spatial variation in community diversity, richness and abundance of ichthyoplankton in coastal newfoundland over two decades |
publishDate |
2009 |
url |
http://collections.mun.ca/cdm/ref/collection/theses4/id/92932 |
op_coverage |
Canada--Newfoundland and Labrador; |
geographic |
Newfoundland Canada |
geographic_facet |
Newfoundland Canada |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (16.65 MB) -- http://collections.mun.ca/PDFs/theses/Carter-Lynn_KellyP.pdf a3242421 http://collections.mun.ca/cdm/ref/collection/theses4/id/92932 |
op_rights |
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. |
_version_ |
1766113432292032512 |