Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean
Abstract An extremely dynamic chain of archipelagos links South America and the Antarctic Peninsula. It includes islands, which are large and small, old and young, near continental margins and isolated, and well sampled and poorly known. The current study sampled the macrobenthos of all the major ar...
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crcambridgeupr:10.1017/s0954102008001168 2024-03-03T08:38:57+00:00 Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean Griffiths, Huw J. Linse, Katrin Barnes, David K.A. 2008 http://dx.doi.org/10.1017/s0954102008001168 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001168 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 20, issue 3, page 213-226 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2008 crcambridgeupr https://doi.org/10.1017/s0954102008001168 2024-02-08T08:43:21Z Abstract An extremely dynamic chain of archipelagos links South America and the Antarctic Peninsula. It includes islands, which are large and small, old and young, near continental margins and isolated, and well sampled and poorly known. The current study sampled the macrobenthos of all the major archipelagos of this arc at shelf and slope depths using an Agassiz trawl. At least four samples (200 m, 500 m, 1000 m and 1500 m) were taken down-slope at Falkland Trough, Shag Rocks, South Georgia, South Thule, Powell Basin, Elephant Island, and Livingston Island sites and one sample was collected in the caldera of Deception Island. Despite the biogeographical and biodiversity importance of this region, this is the first time (by definition) entire standardized trawl samples have been analysed from all its archipelagos and at any consistent taxonomic level. We found 15 phyla and 29 classes of macro- and megafauna in total across the samples, many of which occurred at all sites. Even at remote and geologically young sites richness was high. Richness increased with abundance and wet mass and was highest in the shallow shelf samples and lowest at 1500 m. Abundance and wet mass varied more than two orders of magnitude, even within classes or study areas. There were strong similarities between the ascidian dominated shallow faunas of the two active volcanic sites, Southern Thule and Deception Island despite huge differences in isolation. There were also strong faunal similarities between Falkland Trough and Shag Rocks despite being on opposing sides of the Polar Front. In contrast two near neighbours with similarly soft substrata, Elephant and Livingston islands were amongst the most dissimilar. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Deception Island Elephant Island Livingston Island Southern Ocean Southern Thule Cambridge University Press Antarctic Southern Ocean The Antarctic Antarctic Peninsula Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) Shag Rocks ENVELOPE(-42.033,-42.033,-53.550,-53.550) Powell Basin ENVELOPE(-49.500,-49.500,-62.250,-62.250) Falkland Trough ENVELOPE(-49.750,-49.750,-52.750,-52.750) Southern Thule ENVELOPE(-27.200,-27.200,-59.433,-59.433) Antarctic Science 20 3 213 226 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Griffiths, Huw J. Linse, Katrin Barnes, David K.A. Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract An extremely dynamic chain of archipelagos links South America and the Antarctic Peninsula. It includes islands, which are large and small, old and young, near continental margins and isolated, and well sampled and poorly known. The current study sampled the macrobenthos of all the major archipelagos of this arc at shelf and slope depths using an Agassiz trawl. At least four samples (200 m, 500 m, 1000 m and 1500 m) were taken down-slope at Falkland Trough, Shag Rocks, South Georgia, South Thule, Powell Basin, Elephant Island, and Livingston Island sites and one sample was collected in the caldera of Deception Island. Despite the biogeographical and biodiversity importance of this region, this is the first time (by definition) entire standardized trawl samples have been analysed from all its archipelagos and at any consistent taxonomic level. We found 15 phyla and 29 classes of macro- and megafauna in total across the samples, many of which occurred at all sites. Even at remote and geologically young sites richness was high. Richness increased with abundance and wet mass and was highest in the shallow shelf samples and lowest at 1500 m. Abundance and wet mass varied more than two orders of magnitude, even within classes or study areas. There were strong similarities between the ascidian dominated shallow faunas of the two active volcanic sites, Southern Thule and Deception Island despite huge differences in isolation. There were also strong faunal similarities between Falkland Trough and Shag Rocks despite being on opposing sides of the Polar Front. In contrast two near neighbours with similarly soft substrata, Elephant and Livingston islands were amongst the most dissimilar. |
format |
Article in Journal/Newspaper |
author |
Griffiths, Huw J. Linse, Katrin Barnes, David K.A. |
author_facet |
Griffiths, Huw J. Linse, Katrin Barnes, David K.A. |
author_sort |
Griffiths, Huw J. |
title |
Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean |
title_short |
Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean |
title_full |
Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean |
title_fullStr |
Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean |
title_full_unstemmed |
Distribution of macrobenthic taxa across the Scotia Arc, Southern Ocean |
title_sort |
distribution of macrobenthic taxa across the scotia arc, southern ocean |
publisher |
Cambridge University Press (CUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1017/s0954102008001168 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001168 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-55.184,-55.184,-61.085,-61.085) ENVELOPE(-42.033,-42.033,-53.550,-53.550) ENVELOPE(-49.500,-49.500,-62.250,-62.250) ENVELOPE(-49.750,-49.750,-52.750,-52.750) ENVELOPE(-27.200,-27.200,-59.433,-59.433) |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Deception Island Livingston Island Elephant Island Shag Rocks Powell Basin Falkland Trough Southern Thule |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Deception Island Livingston Island Elephant Island Shag Rocks Powell Basin Falkland Trough Southern Thule |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Deception Island Elephant Island Livingston Island Southern Ocean Southern Thule |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Deception Island Elephant Island Livingston Island Southern Ocean Southern Thule |
op_source |
Antarctic Science volume 20, issue 3, page 213-226 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102008001168 |
container_title |
Antarctic Science |
container_volume |
20 |
container_issue |
3 |
container_start_page |
213 |
op_container_end_page |
226 |
_version_ |
1792494361618939904 |