Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition
Bottom-trawl fisheries are expanding into deeper habitats and higher latitudes, but our understanding of their effects in these areas is limited. The ecological importance of habitat-forming megabenthos and their vulnerability to trawling is acknowledged, but studies on effects are few. Our objectiv...
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ftninstnf:oai:brage.nina.no:11250/2469901 2023-05-15T15:38:32+02:00 Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition Buhl-Mortensen, Lene Ellingsen, Kari Elsa Buhl-Mortensen, Pål Skaar, Kristian Landmark Gonzalez-Mirelis, Genoveva Barents Sea 2016 application/pdf http://hdl.handle.net/11250/2469901 https://doi.org/10.1093/icesjms/fsv200 eng eng Norges forskningsråd: 212135 ICES Journal of Marine Science. 2016, 73 urn:issn:1054-3139 http://hdl.handle.net/11250/2469901 https://doi.org/10.1093/icesjms/fsv200 cristin:1290334 98-114 73 ICES Journal of Marine Science VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Journal article Peer reviewed 2016 ftninstnf https://doi.org/10.1093/icesjms/fsv200 2021-12-23T07:17:21Z Bottom-trawl fisheries are expanding into deeper habitats and higher latitudes, but our understanding of their effects in these areas is limited. The ecological importance of habitat-forming megabenthos and their vulnerability to trawling is acknowledged, but studies on effects are few. Our objective was to investigate chronic effects of otter trawl fishery on substratum and megabenthos on the shelf (50–400 m) and slope (400–2000 m) in the southern Barents Sea. The study area represents a wide range in the history of fishing intensity (FI). Physical impact of trawling, density of trawl marks (TMs), was quantified on 250 video transects from shelf and slope, and megabenthos (.2 cm) composition was studied on 149 video transects from the shelf. The number of satellite-recorded vessels within grid cells 5 × 5 km was used as a proxy for FI in the TM analysis and for the megabenthos records within a 2-km radius around the transects. The effects of using different search area sizes were tested. Patterns in the density of TMs and megabenthos composition were compared with FI using linear regression and correspondence analysis. Occurrence of TMswas not directly related to FI but to bottom type, whereas megabenthos density and diversity showed a negative relation. For 79 of the 97 most common taxa, density was negatively correlated with FI. The sponges Craniella zetlandica and Phakellia/Axinella were particularly vulnerable, but also Flabellum macandrewi (Scleractinia), Ditrupa arietina (Polychaeta), Funiculina quadrangularis (Pennatulacea), and Spatangus purpureus (Echinoidea)were negatively correlated with FI, whereas asteroids, lamp shells, and small sponges showeda positive trend. Our results are an important step towards the understanding of chronic effects of bottom trawling and are discussed in relation to the descriptors “Biological diversity” and “Seafloor integrity” in the EU Marine strategic framework directive. Barents Sea, fishing pressure, management, megabenthos, sponges, trawling impact, video transects, VMS. publishedVersion Article in Journal/Newspaper Barents Sea Norwegian Institute for Nature Research: Brage NINA Barents Sea ICES Journal of Marine Science 73 suppl_1 i98 i114 |
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Norwegian Institute for Nature Research: Brage NINA |
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ftninstnf |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Buhl-Mortensen, Lene Ellingsen, Kari Elsa Buhl-Mortensen, Pål Skaar, Kristian Landmark Gonzalez-Mirelis, Genoveva Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
description |
Bottom-trawl fisheries are expanding into deeper habitats and higher latitudes, but our understanding of their effects in these areas is limited. The ecological importance of habitat-forming megabenthos and their vulnerability to trawling is acknowledged, but studies on effects are few. Our objective was to investigate chronic effects of otter trawl fishery on substratum and megabenthos on the shelf (50–400 m) and slope (400–2000 m) in the southern Barents Sea. The study area represents a wide range in the history of fishing intensity (FI). Physical impact of trawling, density of trawl marks (TMs), was quantified on 250 video transects from shelf and slope, and megabenthos (.2 cm) composition was studied on 149 video transects from the shelf. The number of satellite-recorded vessels within grid cells 5 × 5 km was used as a proxy for FI in the TM analysis and for the megabenthos records within a 2-km radius around the transects. The effects of using different search area sizes were tested. Patterns in the density of TMs and megabenthos composition were compared with FI using linear regression and correspondence analysis. Occurrence of TMswas not directly related to FI but to bottom type, whereas megabenthos density and diversity showed a negative relation. For 79 of the 97 most common taxa, density was negatively correlated with FI. The sponges Craniella zetlandica and Phakellia/Axinella were particularly vulnerable, but also Flabellum macandrewi (Scleractinia), Ditrupa arietina (Polychaeta), Funiculina quadrangularis (Pennatulacea), and Spatangus purpureus (Echinoidea)were negatively correlated with FI, whereas asteroids, lamp shells, and small sponges showeda positive trend. Our results are an important step towards the understanding of chronic effects of bottom trawling and are discussed in relation to the descriptors “Biological diversity” and “Seafloor integrity” in the EU Marine strategic framework directive. Barents Sea, fishing pressure, management, megabenthos, sponges, trawling impact, video transects, VMS. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Buhl-Mortensen, Lene Ellingsen, Kari Elsa Buhl-Mortensen, Pål Skaar, Kristian Landmark Gonzalez-Mirelis, Genoveva |
author_facet |
Buhl-Mortensen, Lene Ellingsen, Kari Elsa Buhl-Mortensen, Pål Skaar, Kristian Landmark Gonzalez-Mirelis, Genoveva |
author_sort |
Buhl-Mortensen, Lene |
title |
Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition |
title_short |
Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition |
title_full |
Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition |
title_fullStr |
Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition |
title_full_unstemmed |
Trawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and composition |
title_sort |
trawling disturbance on megabenthos and sediment in the barents sea: chronic effects on density, diversity, and composition |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2469901 https://doi.org/10.1093/icesjms/fsv200 |
op_coverage |
Barents Sea |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
98-114 73 ICES Journal of Marine Science |
op_relation |
Norges forskningsråd: 212135 ICES Journal of Marine Science. 2016, 73 urn:issn:1054-3139 http://hdl.handle.net/11250/2469901 https://doi.org/10.1093/icesjms/fsv200 cristin:1290334 |
op_doi |
https://doi.org/10.1093/icesjms/fsv200 |
container_title |
ICES Journal of Marine Science |
container_volume |
73 |
container_issue |
suppl_1 |
container_start_page |
i98 |
op_container_end_page |
i114 |
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1766369556668874752 |