Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure
Trawling and dredging on Georges Bank (northwest Atlantic Ocean) have altered the cover of colonial epifauna, as surveyed through in situ photography. A total of 454 photographs were analyzed from areas with gravel substrate between 1994 and 2000 at depths of 40–50 m and 80–90 m. The cover of hydroi...
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ftaquaticcommons:oai:generic.eprints.org:8825 2023-05-15T17:45:40+02:00 Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure Asch, Rebecca G. Collie, Jeremy S. 2008 application/pdf http://aquaticcommons.org/8825/ http://fishbull.noaa.gov/1064/asch.pdf http://aquaticcommons.org/8825/1/asch_Fish_Bull_2008.pdf en eng http://aquaticcommons.org/8825/1/asch_Fish_Bull_2008.pdf Asch, Rebecca G. and Collie, Jeremy S. (2008) Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure. Fishery Bulletin, 106(4), pp. 438-456. Biology Ecology Fisheries Article PeerReviewed 2008 ftaquaticcommons 2020-02-27T09:23:14Z Trawling and dredging on Georges Bank (northwest Atlantic Ocean) have altered the cover of colonial epifauna, as surveyed through in situ photography. A total of 454 photographs were analyzed from areas with gravel substrate between 1994 and 2000 at depths of 40–50 m and 80–90 m. The cover of hydroids, bushy bryozoans, sponges, and tubeworms was generally higher at sites undisturbed by fishing than at sites classified as disturbed. The magnitude and significance of this effect depended on depth and year. Encrusting bryozoans were the only type of colonial epifauna positively affected by bottom fishing. Species richness of noncolonial epifauna declined with increased bottom fishing, but Simpson’s index of diversity typically peaked at intermediate levels of habitat disturbance. Species that were more abundant at undisturbed sites possessed characteristics that made them vulnerable to bottom fishing. These characteristics include emergent growth forms, soft body parts, low motility, use of complex microhabitats, long life spans, slow growth, and larval dispersal over short distances. After the prohibition of bottom fishing at one site, both colonial and noncolonial species increased in abundance. Populations of most taxa took two years or more to increase after the fishing closure. This finding indicates that bottom fishing needs to be reduced to infrequent intervals to sustain the benthic species composition of Georges Bank at a high level of biodiversity and abundance. Article in Journal/Newspaper Northwest Atlantic International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
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Open Polar |
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International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
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ftaquaticcommons |
language |
English |
topic |
Biology Ecology Fisheries |
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Biology Ecology Fisheries Asch, Rebecca G. Collie, Jeremy S. Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
topic_facet |
Biology Ecology Fisheries |
description |
Trawling and dredging on Georges Bank (northwest Atlantic Ocean) have altered the cover of colonial epifauna, as surveyed through in situ photography. A total of 454 photographs were analyzed from areas with gravel substrate between 1994 and 2000 at depths of 40–50 m and 80–90 m. The cover of hydroids, bushy bryozoans, sponges, and tubeworms was generally higher at sites undisturbed by fishing than at sites classified as disturbed. The magnitude and significance of this effect depended on depth and year. Encrusting bryozoans were the only type of colonial epifauna positively affected by bottom fishing. Species richness of noncolonial epifauna declined with increased bottom fishing, but Simpson’s index of diversity typically peaked at intermediate levels of habitat disturbance. Species that were more abundant at undisturbed sites possessed characteristics that made them vulnerable to bottom fishing. These characteristics include emergent growth forms, soft body parts, low motility, use of complex microhabitats, long life spans, slow growth, and larval dispersal over short distances. After the prohibition of bottom fishing at one site, both colonial and noncolonial species increased in abundance. Populations of most taxa took two years or more to increase after the fishing closure. This finding indicates that bottom fishing needs to be reduced to infrequent intervals to sustain the benthic species composition of Georges Bank at a high level of biodiversity and abundance. |
format |
Article in Journal/Newspaper |
author |
Asch, Rebecca G. Collie, Jeremy S. |
author_facet |
Asch, Rebecca G. Collie, Jeremy S. |
author_sort |
Asch, Rebecca G. |
title |
Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
title_short |
Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
title_full |
Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
title_fullStr |
Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
title_full_unstemmed |
Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
title_sort |
changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure |
publishDate |
2008 |
url |
http://aquaticcommons.org/8825/ http://fishbull.noaa.gov/1064/asch.pdf http://aquaticcommons.org/8825/1/asch_Fish_Bull_2008.pdf |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
http://aquaticcommons.org/8825/1/asch_Fish_Bull_2008.pdf Asch, Rebecca G. and Collie, Jeremy S. (2008) Changes in a benthic megafaunal community due to disturbance from bottom fishing and the establishment of a fishery closure. Fishery Bulletin, 106(4), pp. 438-456. |
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1766148871005667328 |