Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors
International audience Faunal assemblages of benthic megainvertebrates from Georges Bank (NW Atlantic) commercial scallop beds were defined from video-monitored sled-dredge samples. The distribution, diversity, abundance, and biomass of the megafauna were studied in relation to water depth and sedim...
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ftccsdartic:oai:HAL:hal-00524779v1 2023-05-15T15:22:31+02:00 Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors Thouzeau, Gérard Robert, G. Ugarte, R. Department of Fisheries and Oceans - Halifax Fisheries Research laboratory 1991 https://hal.univ-brest.fr/hal-00524779 https://doi.org/10.3354/meps074061 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps074061 hal-00524779 https://hal.univ-brest.fr/hal-00524779 doi:10.3354/meps074061 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.univ-brest.fr/hal-00524779 Marine Ecology Progress Series, Inter Research, 1991, 74 (1), pp.61-82. ⟨10.3354/meps074061⟩ PECTEN-MAXIMUS BAY ORDINATION SEDIMENT ATLANTIC MAINE GULF [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 1991 ftccsdartic https://doi.org/10.3354/meps074061 2020-12-26T07:10:32Z International audience Faunal assemblages of benthic megainvertebrates from Georges Bank (NW Atlantic) commercial scallop beds were defined from video-monitored sled-dredge samples. The distribution, diversity, abundance, and biomass of the megafauna were studied in relation to water depth and sediment types. A total of 140 species of megainvertebrates representing 10 phyla were identified, from which epibenthic taxa accounted for ca 76%. Molluscs, crustaceans, annelids, and echinoderms were best represented, with bivalves ranking first in abundance (55%) and biomass (86%). Significant changes of species diversity, total abundance, and total biomass were found according to sediment type, but not according to depth (except for total biomass). No clear bathymetric pattern was observed, although the mean number of species, mean total density (below 80 m), and mean total biomass (below 60 m) decreased with increasing depth in the deepest zone. Maximum megafaunal richness was found in biogenic bottoms while minimum value occurred in sand dunes. Total biomass and total density were consistently dominated by a small number of taxa. Three bivalve species (Spisula solidissima, Arctica islandica, Placopecten magellanicus) made up to 71% of total biomass overall, while 14 species (predominantly Anomia spp., Arctica islandica, and Ophiopholis aculeata) accounted for 70% of total density. Six megafaunal associations related to 2 major assemblages (biogenic sand-gravel and sand-shell fauna) were defined from multivariate analyses. Sediment type, tidal current speed, turbulent mixing, and food availability appear to be the major distribution-regulating factors of the megabenthos in the 55 to 105 m depth range. Density-dependent predator-prey relationships were the main biological associations shown by megainvertebrates. Article in Journal/Newspaper Arctica islandica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Marine Ecology Progress Series 74 61 82 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
PECTEN-MAXIMUS BAY ORDINATION SEDIMENT ATLANTIC MAINE GULF [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
PECTEN-MAXIMUS BAY ORDINATION SEDIMENT ATLANTIC MAINE GULF [SDE.BE]Environmental Sciences/Biodiversity and Ecology Thouzeau, Gérard Robert, G. Ugarte, R. Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors |
topic_facet |
PECTEN-MAXIMUS BAY ORDINATION SEDIMENT ATLANTIC MAINE GULF [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience Faunal assemblages of benthic megainvertebrates from Georges Bank (NW Atlantic) commercial scallop beds were defined from video-monitored sled-dredge samples. The distribution, diversity, abundance, and biomass of the megafauna were studied in relation to water depth and sediment types. A total of 140 species of megainvertebrates representing 10 phyla were identified, from which epibenthic taxa accounted for ca 76%. Molluscs, crustaceans, annelids, and echinoderms were best represented, with bivalves ranking first in abundance (55%) and biomass (86%). Significant changes of species diversity, total abundance, and total biomass were found according to sediment type, but not according to depth (except for total biomass). No clear bathymetric pattern was observed, although the mean number of species, mean total density (below 80 m), and mean total biomass (below 60 m) decreased with increasing depth in the deepest zone. Maximum megafaunal richness was found in biogenic bottoms while minimum value occurred in sand dunes. Total biomass and total density were consistently dominated by a small number of taxa. Three bivalve species (Spisula solidissima, Arctica islandica, Placopecten magellanicus) made up to 71% of total biomass overall, while 14 species (predominantly Anomia spp., Arctica islandica, and Ophiopholis aculeata) accounted for 70% of total density. Six megafaunal associations related to 2 major assemblages (biogenic sand-gravel and sand-shell fauna) were defined from multivariate analyses. Sediment type, tidal current speed, turbulent mixing, and food availability appear to be the major distribution-regulating factors of the megabenthos in the 55 to 105 m depth range. Density-dependent predator-prey relationships were the main biological associations shown by megainvertebrates. |
author2 |
Department of Fisheries and Oceans - Halifax Fisheries Research laboratory |
format |
Article in Journal/Newspaper |
author |
Thouzeau, Gérard Robert, G. Ugarte, R. |
author_facet |
Thouzeau, Gérard Robert, G. Ugarte, R. |
author_sort |
Thouzeau, Gérard |
title |
Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors |
title_short |
Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors |
title_full |
Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors |
title_fullStr |
Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors |
title_full_unstemmed |
Faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern Georges Bank, in relation to environmental factors |
title_sort |
faunal assemblages of benthic megainvertebrates inhabiting sea scallop grounds from eastern georges bank, in relation to environmental factors |
publisher |
HAL CCSD |
publishDate |
1991 |
url |
https://hal.univ-brest.fr/hal-00524779 https://doi.org/10.3354/meps074061 |
genre |
Arctica islandica |
genre_facet |
Arctica islandica |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.univ-brest.fr/hal-00524779 Marine Ecology Progress Series, Inter Research, 1991, 74 (1), pp.61-82. ⟨10.3354/meps074061⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps074061 hal-00524779 https://hal.univ-brest.fr/hal-00524779 doi:10.3354/meps074061 |
op_doi |
https://doi.org/10.3354/meps074061 |
container_title |
Marine Ecology Progress Series |
container_volume |
74 |
container_start_page |
61 |
op_container_end_page |
82 |
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1766353163268390912 |