The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes
The range of limnological conditions that support Atlantic cod populations in meromictic Arctic lakes is known to be relatively restricted. The degree to which differences in these features, particularly in the availability of allochthonous and autochthonous prey, affect the condition and growth of...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2013
|
Subjects: | |
Online Access: | http://hdl.handle.net/10222/28944 |
id |
ftdalhouse:oai:DalSpace.library.dal.ca:10222/28944 |
---|---|
record_format |
openpolar |
spelling |
ftdalhouse:oai:DalSpace.library.dal.ca:10222/28944 2023-05-15T14:19:51+02:00 The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes Hardie, David C. Hutchings, Jeffrey Alexander 2013-07-04T18:43:05Z http://hdl.handle.net/10222/28944 unknown Arctic Hardie, David C., and Jeffrey A. Hutchings. 2011. "The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes." Arctic 64(2): 137-150. 0004-0843 http://hdl.handle.net/10222/28944 64 2 137 article 2013 ftdalhouse 2021-12-29T18:08:48Z The range of limnological conditions that support Atlantic cod populations in meromictic Arctic lakes is known to be relatively restricted. The degree to which differences in these features, particularly in the availability of allochthonous and autochthonous prey, affect the condition and growth of cod in these populations is unknown. We compared measures of condition among three Atlantic cod populations on Baffin Island, Nunavut, to assess their relationship to differences in potentially important habitat parameters. We also compared data spanning two decades (Ogac Lake) to five decades (Qasigialiminiq) to assess the degree to which natural and anthropogenic factors may have affected these populations. In general, growth rate and asymptotic length tend to be high under situations of intense cannibalism and when alternative prey species are relatively abundant. Biotic and abiotic habitat features in Ogac Lake appear to have been relatively stable since the 1950s, although the abundance of sea urchins appears to have decreased, which may explain the observation that the incidence of cannibalism has doubled. The mean size of angled cod in Qasigialiminiq has decreased by about 10 cm over the past 20 years. Article in Journal/Newspaper Arctic Arctic atlantic cod Baffin Island Baffin Gadus morhua Nunavut Dalhousie University: DalSpace Institutional Repository Arctic Baffin Island Nunavut |
institution |
Open Polar |
collection |
Dalhousie University: DalSpace Institutional Repository |
op_collection_id |
ftdalhouse |
language |
unknown |
description |
The range of limnological conditions that support Atlantic cod populations in meromictic Arctic lakes is known to be relatively restricted. The degree to which differences in these features, particularly in the availability of allochthonous and autochthonous prey, affect the condition and growth of cod in these populations is unknown. We compared measures of condition among three Atlantic cod populations on Baffin Island, Nunavut, to assess their relationship to differences in potentially important habitat parameters. We also compared data spanning two decades (Ogac Lake) to five decades (Qasigialiminiq) to assess the degree to which natural and anthropogenic factors may have affected these populations. In general, growth rate and asymptotic length tend to be high under situations of intense cannibalism and when alternative prey species are relatively abundant. Biotic and abiotic habitat features in Ogac Lake appear to have been relatively stable since the 1950s, although the abundance of sea urchins appears to have decreased, which may explain the observation that the incidence of cannibalism has doubled. The mean size of angled cod in Qasigialiminiq has decreased by about 10 cm over the past 20 years. |
format |
Article in Journal/Newspaper |
author |
Hardie, David C. Hutchings, Jeffrey Alexander |
spellingShingle |
Hardie, David C. Hutchings, Jeffrey Alexander The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes |
author_facet |
Hardie, David C. Hutchings, Jeffrey Alexander |
author_sort |
Hardie, David C. |
title |
The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes |
title_short |
The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes |
title_full |
The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes |
title_fullStr |
The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes |
title_full_unstemmed |
The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes |
title_sort |
ecology of atlantic cod (gadus morhua) in canadian arctic lakes |
publishDate |
2013 |
url |
http://hdl.handle.net/10222/28944 |
geographic |
Arctic Baffin Island Nunavut |
geographic_facet |
Arctic Baffin Island Nunavut |
genre |
Arctic Arctic atlantic cod Baffin Island Baffin Gadus morhua Nunavut |
genre_facet |
Arctic Arctic atlantic cod Baffin Island Baffin Gadus morhua Nunavut |
op_relation |
Arctic Hardie, David C., and Jeffrey A. Hutchings. 2011. "The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes." Arctic 64(2): 137-150. 0004-0843 http://hdl.handle.net/10222/28944 64 2 137 |
_version_ |
1766291576535908352 |