Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland
The predatory behaviour of two species of juvenile wolffish (Anarhichas lupus and Anarhichas minor) was studied during a field campaign across a frontal area off western Greenland. The study focused on ontogenetic changes in prey-type and -size preference of the wolffish and their predatory impact o...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2002
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Online Access: | http://dx.doi.org/10.1139/f02-147 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-147 |
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crcansciencepubl:10.1139/f02-147 2023-12-17T10:30:55+01:00 Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland Munk, Peter 2002 http://dx.doi.org/10.1139/f02-147 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-147 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 11, page 1759-1767 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2002 crcansciencepubl https://doi.org/10.1139/f02-147 2023-11-19T13:39:01Z The predatory behaviour of two species of juvenile wolffish (Anarhichas lupus and Anarhichas minor) was studied during a field campaign across a frontal area off western Greenland. The study focused on ontogenetic changes in prey-type and -size preference of the wolffish and their predatory impact on a cohabiting population of larval sand lance (Ammodytes sp.). Sampling took place along a cross-shelf transect at latitude 66°20' N, and the analysis is based on stomach contents of assembled wolffish (25 cm in length) and abundance estimates of plankton and fish. An ontogenetic change in wolffish prey preference was evident as a dietary shift from copepods and smaller amphipods to larger amphipods and fish larvae. The inclusion of fish larvae in the wolffish diet led to a marked increase in prey biomass, and fish larvae constituted up to 77% of diet biomass in the largest juveniles caught. Wolffish selectively targeted the smaller-sized part of the larval sand lance population; hence, larval vulnerability increased with decreasing size. Comparison between estimated predation rates and abundances of predator and prey indicated larval predation mortalities of up to 5% per day, with mortality peaking in the vicinity of a hydrographic front. Hence, findings suggest substantial predation pressure on larvae, primarily related to larval size and distribution. Article in Journal/Newspaper Greenland Copepods Canadian Science Publishing (via Crossref) Greenland Canadian Journal of Fisheries and Aquatic Sciences 59 11 1759 1767 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Munk, Peter Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The predatory behaviour of two species of juvenile wolffish (Anarhichas lupus and Anarhichas minor) was studied during a field campaign across a frontal area off western Greenland. The study focused on ontogenetic changes in prey-type and -size preference of the wolffish and their predatory impact on a cohabiting population of larval sand lance (Ammodytes sp.). Sampling took place along a cross-shelf transect at latitude 66°20' N, and the analysis is based on stomach contents of assembled wolffish (25 cm in length) and abundance estimates of plankton and fish. An ontogenetic change in wolffish prey preference was evident as a dietary shift from copepods and smaller amphipods to larger amphipods and fish larvae. The inclusion of fish larvae in the wolffish diet led to a marked increase in prey biomass, and fish larvae constituted up to 77% of diet biomass in the largest juveniles caught. Wolffish selectively targeted the smaller-sized part of the larval sand lance population; hence, larval vulnerability increased with decreasing size. Comparison between estimated predation rates and abundances of predator and prey indicated larval predation mortalities of up to 5% per day, with mortality peaking in the vicinity of a hydrographic front. Hence, findings suggest substantial predation pressure on larvae, primarily related to larval size and distribution. |
format |
Article in Journal/Newspaper |
author |
Munk, Peter |
author_facet |
Munk, Peter |
author_sort |
Munk, Peter |
title |
Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland |
title_short |
Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland |
title_full |
Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland |
title_fullStr |
Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland |
title_full_unstemmed |
Larval sand lance ( Ammodytes sp.) in the diet of small juvenile wolffish ( Anarhichas spp.): predatory interactions in frontal water masses off western Greenland |
title_sort |
larval sand lance ( ammodytes sp.) in the diet of small juvenile wolffish ( anarhichas spp.): predatory interactions in frontal water masses off western greenland |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/f02-147 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-147 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Copepods |
genre_facet |
Greenland Copepods |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 11, page 1759-1767 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f02-147 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
59 |
container_issue |
11 |
container_start_page |
1759 |
op_container_end_page |
1767 |
_version_ |
1785584040730951680 |