alutus) in Pribilof Canyon, Bering Sea
Shelf edge canyons are well-known sites of enhanced biomass due to on-shore transport and concentration of zooplankton along their axes, both of which contribute to the high densities of nekton frequently found in these canyons. Using a combination of acoustics, trawling, and in situ observations wi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.529.8510 2023-05-15T15:43:32+02:00 alutus) in Pribilof Canyon, Bering Sea Richard D. Brodeur The Pennsylvania State University CiteSeerX Archives 2000 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.529.8510 http://www.pmel.noaa.gov/foci/publications/2001/brodS368.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.529.8510 http://www.pmel.noaa.gov/foci/publications/2001/brodS368.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.pmel.noaa.gov/foci/publications/2001/brodS368.pdf text 2000 ftciteseerx 2016-01-08T10:31:17Z Shelf edge canyons are well-known sites of enhanced biomass due to on-shore transport and concentration of zooplankton along their axes, both of which contribute to the high densities of nekton frequently found in these canyons. Using a combination of acoustics, trawling, and in situ observations with a remotely operated vehicle (ROV), the distribution of pelagic and demersal biota within Pribilof Canyon in the Bering Sea was examined in September of 1995 and 1997. Near-bottom acoustic scattering patterns in the 38 kHz data showed high concentrations of biomass beginning around the 180m bottom depth contour and continuing to about 220m, which were presumed to be adult fish based on their target strength distributions. The 120 kHz data also showed very strong scattering in the water column between 150 and 175m, which was absent from the 38 kHz data, and therefore attributed mainly to zooplankton. The dominant taxa collected in bottom trawls and mid-water plankton tows were adult rockfishes (Pacific ocean perch, Sebastes alutus) and euphausiids (Thysanoessa spp.), respectively. In situ videos revealed dense aggregations of these rockfishes inhabiting a ‘‘forest’ ’ of attached sea whips, Halipteris willemoesi, during night deployments of the ROV, while areas with damaged sea whips had far fewer rockfish, and areas without this biotic habitat structure had no rockfish. During the day, the rockfishes were seen above Text Bering Sea Unknown Bering Sea Pacific Pribilof Canyon ENVELOPE(-170.000,-170.000,55.583,55.583) |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
Shelf edge canyons are well-known sites of enhanced biomass due to on-shore transport and concentration of zooplankton along their axes, both of which contribute to the high densities of nekton frequently found in these canyons. Using a combination of acoustics, trawling, and in situ observations with a remotely operated vehicle (ROV), the distribution of pelagic and demersal biota within Pribilof Canyon in the Bering Sea was examined in September of 1995 and 1997. Near-bottom acoustic scattering patterns in the 38 kHz data showed high concentrations of biomass beginning around the 180m bottom depth contour and continuing to about 220m, which were presumed to be adult fish based on their target strength distributions. The 120 kHz data also showed very strong scattering in the water column between 150 and 175m, which was absent from the 38 kHz data, and therefore attributed mainly to zooplankton. The dominant taxa collected in bottom trawls and mid-water plankton tows were adult rockfishes (Pacific ocean perch, Sebastes alutus) and euphausiids (Thysanoessa spp.), respectively. In situ videos revealed dense aggregations of these rockfishes inhabiting a ‘‘forest’ ’ of attached sea whips, Halipteris willemoesi, during night deployments of the ROV, while areas with damaged sea whips had far fewer rockfish, and areas without this biotic habitat structure had no rockfish. During the day, the rockfishes were seen above |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Richard D. Brodeur |
spellingShingle |
Richard D. Brodeur alutus) in Pribilof Canyon, Bering Sea |
author_facet |
Richard D. Brodeur |
author_sort |
Richard D. Brodeur |
title |
alutus) in Pribilof Canyon, Bering Sea |
title_short |
alutus) in Pribilof Canyon, Bering Sea |
title_full |
alutus) in Pribilof Canyon, Bering Sea |
title_fullStr |
alutus) in Pribilof Canyon, Bering Sea |
title_full_unstemmed |
alutus) in Pribilof Canyon, Bering Sea |
title_sort |
alutus) in pribilof canyon, bering sea |
publishDate |
2000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.529.8510 http://www.pmel.noaa.gov/foci/publications/2001/brodS368.pdf |
long_lat |
ENVELOPE(-170.000,-170.000,55.583,55.583) |
geographic |
Bering Sea Pacific Pribilof Canyon |
geographic_facet |
Bering Sea Pacific Pribilof Canyon |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
http://www.pmel.noaa.gov/foci/publications/2001/brodS368.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.529.8510 http://www.pmel.noaa.gov/foci/publications/2001/brodS368.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766377711857565696 |