Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground
Capelin (Mallotus villosus) tridimensional distribution at the head of the Laurentian Channel in the St. Lawrence estuary was investigated using 38- and 120-kHz acoustic surveys in the summers of 1994, 1995, 1997, and 1998. The results are interpreted with the help of a high-resolution tridimensiona...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f01-210 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-210 |
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crcansciencepubl:10.1139/f01-210 2024-09-15T17:57:14+00:00 Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground Simard, Yvan Lavoie, Diane Saucier, François J 2002 http://dx.doi.org/10.1139/f01-210 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-210 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 2, page 197-210 ISSN 0706-652X 1205-7533 journal-article 2002 crcansciencepubl https://doi.org/10.1139/f01-210 2024-08-08T04:13:37Z Capelin (Mallotus villosus) tridimensional distribution at the head of the Laurentian Channel in the St. Lawrence estuary was investigated using 38- and 120-kHz acoustic surveys in the summers of 1994, 1995, 1997, and 1998. The results are interpreted with the help of a high-resolution tridimensional tidal circulation model. Total biomasses were small (934583 t) and showed rapid fluctuations, whereas mesoscale distribution was more constant. Capelin tended to occupy the very end of the channel head, especially the slopes and shallows surrounding the basins. This pattern did not coincide with the krill distribution, but the two total biomass series were significantly correlated. Capelin tidal dynamics is characterized by herding of capelin against the channel head slopes by the starting flooding currents, followed by an upwelling over the sills and shallows during maximum flood currents, and a return to the channel by the surface outflow during ebb. Each side of the channel head has a distinct capelin retention tidal cycle involving passive advection, swimming, and the two-layer estuarine circulation. This capelin distribution and tidal dynamics closely match the local fin whale (Balaenoptera physalus) and minke whale (Balaenoptera acutorostrata) distributions observed from the whale-watching fleet and typical tidal feeding strategies at the channel head. Article in Journal/Newspaper Balaenoptera acutorostrata Balaenoptera physalus Fin whale minke whale Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 59 2 197 210 |
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Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Capelin (Mallotus villosus) tridimensional distribution at the head of the Laurentian Channel in the St. Lawrence estuary was investigated using 38- and 120-kHz acoustic surveys in the summers of 1994, 1995, 1997, and 1998. The results are interpreted with the help of a high-resolution tridimensional tidal circulation model. Total biomasses were small (934583 t) and showed rapid fluctuations, whereas mesoscale distribution was more constant. Capelin tended to occupy the very end of the channel head, especially the slopes and shallows surrounding the basins. This pattern did not coincide with the krill distribution, but the two total biomass series were significantly correlated. Capelin tidal dynamics is characterized by herding of capelin against the channel head slopes by the starting flooding currents, followed by an upwelling over the sills and shallows during maximum flood currents, and a return to the channel by the surface outflow during ebb. Each side of the channel head has a distinct capelin retention tidal cycle involving passive advection, swimming, and the two-layer estuarine circulation. This capelin distribution and tidal dynamics closely match the local fin whale (Balaenoptera physalus) and minke whale (Balaenoptera acutorostrata) distributions observed from the whale-watching fleet and typical tidal feeding strategies at the channel head. |
format |
Article in Journal/Newspaper |
author |
Simard, Yvan Lavoie, Diane Saucier, François J |
spellingShingle |
Simard, Yvan Lavoie, Diane Saucier, François J Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground |
author_facet |
Simard, Yvan Lavoie, Diane Saucier, François J |
author_sort |
Simard, Yvan |
title |
Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground |
title_short |
Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground |
title_full |
Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground |
title_fullStr |
Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground |
title_full_unstemmed |
Channel head dynamics: capelin ( Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground |
title_sort |
channel head dynamics: capelin ( mallotus villosus) aggregation in the tidally driven upwelling system of the saguenay - st. lawrence marine park's whale feeding ground |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/f01-210 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-210 |
genre |
Balaenoptera acutorostrata Balaenoptera physalus Fin whale minke whale |
genre_facet |
Balaenoptera acutorostrata Balaenoptera physalus Fin whale minke whale |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 2, page 197-210 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f01-210 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
59 |
container_issue |
2 |
container_start_page |
197 |
op_container_end_page |
210 |
_version_ |
1810433394478153728 |