Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995
Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. Biology Bibliography: leaves 63-70 Longterm fish community changes on southern Grand and St. Pierre Banks were examined from dedicated research survey trawls conducted by the Canadian Department of Fisheries and Oceans from 1951-1995. These...
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
2000
|
Subjects: | |
Online Access: | http://collections.mun.ca/cdm/ref/collection/theses3/id/20122 |
id |
ftmemorialunivdc:oai:collections.mun.ca:theses3/20122 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialunivdc:oai:collections.mun.ca:theses3/20122 2023-05-15T17:23:32+02:00 Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 Casey, Jill M., 1970- Memorial University of Newfoundland. Dept. of Biology Grand Banks of Newfoundland 2000 viii, 111 leaves : maps Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses3/id/20122 eng eng Electronic Theses and Dissertations (12.32 MB) -- http://collections.mun.ca/PDFs/theses/Casey_JillM.pdf a1475487 http://collections.mun.ca/cdm/ref/collection/theses3/id/20122 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--Grand Banks of Newfoundland Fish communities--Saint Pierre Bank Region Text Electronic thesis or dissertation 2000 ftmemorialunivdc 2015-08-06T19:17:43Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. Biology Bibliography: leaves 63-70 Longterm fish community changes on southern Grand and St. Pierre Banks were examined from dedicated research survey trawls conducted by the Canadian Department of Fisheries and Oceans from 1951-1995. These time series pre-date the arrival of factory-freezer-trawlers in the 1960's and 1970's. and thus provide insight into changes in the biomass and diversity of an exploited system. The time series were standardized by applying conversion factors for changes in vessel, diel changes in catchability, and relative catchability of selected species. Total biomass in the 1990's was reduced to 11% and 9% of that observed in the 1950's on southern Grand Bank and St. Pierre Bank, respectively, and largely resulted from the decline of the haddock population. Compensatory responses to this decline were visible with the flatfish on southern Grand Bank and skate on St. Pierre Bank but continued fisheries for flatfish and bycatch of skate ensured that total species biomass would remain at low levels. This study shows the importance of examining data on as long a time-scale as possible. Failure to examine such historical data has resulted in the largest skate in the northwest Atlantic, the barndoor skate, being driven to near extinction without anyone noticing. Thesis Newfoundland studies Northwest Atlantic University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Fish communities--Grand Banks of Newfoundland Fish communities--Saint Pierre Bank Region |
spellingShingle |
Fish communities--Grand Banks of Newfoundland Fish communities--Saint Pierre Bank Region Casey, Jill M., 1970- Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 |
topic_facet |
Fish communities--Grand Banks of Newfoundland Fish communities--Saint Pierre Bank Region |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. Biology Bibliography: leaves 63-70 Longterm fish community changes on southern Grand and St. Pierre Banks were examined from dedicated research survey trawls conducted by the Canadian Department of Fisheries and Oceans from 1951-1995. These time series pre-date the arrival of factory-freezer-trawlers in the 1960's and 1970's. and thus provide insight into changes in the biomass and diversity of an exploited system. The time series were standardized by applying conversion factors for changes in vessel, diel changes in catchability, and relative catchability of selected species. Total biomass in the 1990's was reduced to 11% and 9% of that observed in the 1950's on southern Grand Bank and St. Pierre Bank, respectively, and largely resulted from the decline of the haddock population. Compensatory responses to this decline were visible with the flatfish on southern Grand Bank and skate on St. Pierre Bank but continued fisheries for flatfish and bycatch of skate ensured that total species biomass would remain at low levels. This study shows the importance of examining data on as long a time-scale as possible. Failure to examine such historical data has resulted in the largest skate in the northwest Atlantic, the barndoor skate, being driven to near extinction without anyone noticing. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
Casey, Jill M., 1970- |
author_facet |
Casey, Jill M., 1970- |
author_sort |
Casey, Jill M., 1970- |
title |
Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 |
title_short |
Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 |
title_full |
Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 |
title_fullStr |
Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 |
title_full_unstemmed |
Fish community changes in an exploited marine ecosystem : Newfoundland Southern Grand Bank and St. Pierre Bank, 1951-1995 |
title_sort |
fish community changes in an exploited marine ecosystem : newfoundland southern grand bank and st. pierre bank, 1951-1995 |
publishDate |
2000 |
url |
http://collections.mun.ca/cdm/ref/collection/theses3/id/20122 |
op_coverage |
Grand Banks of Newfoundland |
genre |
Newfoundland studies Northwest Atlantic University of Newfoundland |
genre_facet |
Newfoundland studies Northwest Atlantic University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (12.32 MB) -- http://collections.mun.ca/PDFs/theses/Casey_JillM.pdf a1475487 http://collections.mun.ca/cdm/ref/collection/theses3/id/20122 |
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_ |
1766113051619098624 |