A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation
Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. Biology Bibliography: leaves 109-119. I present a model of intrapopulation structure in northern Atlantic cod (Gadus morhua) inhabiting the coastal and continental shelf regions off northeast Newfoundland and Labrador based on metapopulation...
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ftmemorialunivdc:oai:collections.mun.ca:theses5/45913 2023-05-15T15:26:54+02:00 A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation Smedbol, R. Kent, 1968- Memorial University of Newfoundland. Dept. of Biology Canada--Newfoundland and Labrador 1999 xv, 130 leaves : ill., maps Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/45913 Eng eng Electronic Theses and Dissertations (22.60 MB) -- http://collections.mun.ca/PDFs/theses/Smedbol_RKent.pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/45913 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 Atlantic cod--Spawning--Newfoundland and Labrador Atlantic cod--Newfoundland and Labrador--Geographical distribution Fish populations--Newfoundland and Labrador--Measurement Text Electronic thesis or dissertation 1999 ftmemorialunivdc 2015-08-06T19:22:53Z Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. Biology Bibliography: leaves 109-119. I present a model of intrapopulation structure in northern Atlantic cod (Gadus morhua) inhabiting the coastal and continental shelf regions off northeast Newfoundland and Labrador based on metapopulation dynamics. I suggest that the metapopulation concept may best explain the historical patterns and present day observations of northern cod distribution. Evidence for subpopulation structure is assembled from new and published data sources, including studies of spawning time and location, migration behaviour, and genetic variation. A theoretical model of northern cod metapopulation dynamics is derived from the simple model of Levins (1970). I consider the various spawning components of northern cod historically centered on the offshore banks and in coastal bays as subpopulations of a northern cod metapopulation. I modify the Levins (1970) model by separating the probability of subpopulation extinction into two component probabilities representing: (1) natural processes and (2) the effects of fishing. Metapopulation theory predicts that fewer suitable areas (spawning grounds) will be occupied as population abundance declines. The corollary prediction is that as population abundance recovers, spawners will recolonize the currently unoccupied spawning areas. The agents of colonization may be migratory adult fish and straying larvae. The model supports the current view that overfishing may have played an important role in the extinction of northern subpopulations off Labrador. Thesis atlantic cod Gadus morhua Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Newfoundland Canada |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Atlantic cod--Spawning--Newfoundland and Labrador Atlantic cod--Newfoundland and Labrador--Geographical distribution Fish populations--Newfoundland and Labrador--Measurement |
spellingShingle |
Atlantic cod--Spawning--Newfoundland and Labrador Atlantic cod--Newfoundland and Labrador--Geographical distribution Fish populations--Newfoundland and Labrador--Measurement Smedbol, R. Kent, 1968- A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation |
topic_facet |
Atlantic cod--Spawning--Newfoundland and Labrador Atlantic cod--Newfoundland and Labrador--Geographical distribution Fish populations--Newfoundland and Labrador--Measurement |
description |
Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. Biology Bibliography: leaves 109-119. I present a model of intrapopulation structure in northern Atlantic cod (Gadus morhua) inhabiting the coastal and continental shelf regions off northeast Newfoundland and Labrador based on metapopulation dynamics. I suggest that the metapopulation concept may best explain the historical patterns and present day observations of northern cod distribution. Evidence for subpopulation structure is assembled from new and published data sources, including studies of spawning time and location, migration behaviour, and genetic variation. A theoretical model of northern cod metapopulation dynamics is derived from the simple model of Levins (1970). I consider the various spawning components of northern cod historically centered on the offshore banks and in coastal bays as subpopulations of a northern cod metapopulation. I modify the Levins (1970) model by separating the probability of subpopulation extinction into two component probabilities representing: (1) natural processes and (2) the effects of fishing. Metapopulation theory predicts that fewer suitable areas (spawning grounds) will be occupied as population abundance declines. The corollary prediction is that as population abundance recovers, spawners will recolonize the currently unoccupied spawning areas. The agents of colonization may be migratory adult fish and straying larvae. The model supports the current view that overfishing may have played an important role in the extinction of northern subpopulations off Labrador. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
Smedbol, R. Kent, 1968- |
author_facet |
Smedbol, R. Kent, 1968- |
author_sort |
Smedbol, R. Kent, 1968- |
title |
A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation |
title_short |
A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation |
title_full |
A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation |
title_fullStr |
A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation |
title_full_unstemmed |
A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation |
title_sort |
study of northern atlantic cod (gadus morhua) of eastern newfoundland and labrador as a metapopulation |
publishDate |
1999 |
url |
http://collections.mun.ca/cdm/ref/collection/theses5/id/45913 |
op_coverage |
Canada--Newfoundland and Labrador |
geographic |
Newfoundland Canada |
geographic_facet |
Newfoundland Canada |
genre |
atlantic cod Gadus morhua Newfoundland studies University of Newfoundland |
genre_facet |
atlantic cod Gadus morhua 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 (22.60 MB) -- http://collections.mun.ca/PDFs/theses/Smedbol_RKent.pdf http://collections.mun.ca/cdm/ref/collection/theses5/id/45913 |
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_ |
1766357384210415616 |