Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991
Species composition, distribution and biogeography of polychaetes collected from the soft bottoms of the Straits of Magellan (South America) in February-March 1991 are reported. In 16 benthic samples, collected with different tools (Charcot and triangular dredges, van Veen grab), a total of 1132 ind...
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Consejo Superior de Investigaciones Científicas
1999
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Online Access: | https://doi.org/10.3989/scimar.1999.63s1233 https://doaj.org/article/183954d46a4142319911e2d2dbdaa763 |
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ftdoajarticles:oai:doaj.org/article:183954d46a4142319911e2d2dbdaa763 2023-05-15T13:52:14+02:00 Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 María Cristina Gambi Simone Mariani 1999-12-01T00:00:00Z https://doi.org/10.3989/scimar.1999.63s1233 https://doaj.org/article/183954d46a4142319911e2d2dbdaa763 EN eng Consejo Superior de Investigaciones Científicas http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/908 https://doaj.org/toc/0214-8358 https://doaj.org/toc/1886-8134 0214-8358 1886-8134 doi:10.3989/scimar.1999.63s1233 https://doaj.org/article/183954d46a4142319911e2d2dbdaa763 Scientia Marina, Vol 63, Iss S1, Pp 233-242 (1999) polychaetes soft bottoms biogeography distribution straits of magellan south america subantarctic region Aquaculture. Fisheries. Angling SH1-691 article 1999 ftdoajarticles https://doi.org/10.3989/scimar.1999.63s1233 2022-12-31T06:23:14Z Species composition, distribution and biogeography of polychaetes collected from the soft bottoms of the Straits of Magellan (South America) in February-March 1991 are reported. In 16 benthic samples, collected with different tools (Charcot and triangular dredges, van Veen grab), a total of 1132 individuals belonging to 119 taxa of polychaetes were collected; only 49 of the taxa found have been determined at species level. Eighteen species were recorded for the first time in the Straits of Magellan. Species richness was relatively high considering both the number of individuals collected, and the taxa known from previous studies on the area (182 species). The biogeographical analysis, conducted only on the 49 taxa classified at the species level, showed the dominance of Magellan-Antarctic-Subantarctic species (M-An-S 50%), followed by Magellan-American (M-Am 14%), Magellan-Antarctic (M-An 12%), Magellan-Subantarctic (M-S 6%), Cosmopolitans (C 10%), and also by a few species with disjunct distribution (D 8%). Values of the Sørensen similarity index among stations were very low (below 0.30) with a few exceptions. Both number of species and of individuals were higher in the Atlantic sector of the Straits, especially at some stations characterized by heterogeneous mixed sediments (gravels and pebbles) and biogenic debris (mollusc thanatocoenosis). The high number of species recorded, coupled with low similarity values among stations, suggests that the soft bottoms of the Straits of Magellan show, at medium scale, a highly diversified mosaic of different biotopes. This can be due to various factors which are expected to vary along the wide geographic area investigated, such as the wide bathymetric range sampled, the type of sampling gears used, and last but not least the occurrence of many different environmental situations along the Straits. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic Charcot ENVELOPE(139.017,139.017,-69.367,-69.367) Van Veen ENVELOPE(161.900,161.900,-71.583,-71.583) Scientia Marina 63 S1 233 242 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
polychaetes soft bottoms biogeography distribution straits of magellan south america subantarctic region Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
polychaetes soft bottoms biogeography distribution straits of magellan south america subantarctic region Aquaculture. Fisheries. Angling SH1-691 María Cristina Gambi Simone Mariani Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 |
topic_facet |
polychaetes soft bottoms biogeography distribution straits of magellan south america subantarctic region Aquaculture. Fisheries. Angling SH1-691 |
description |
Species composition, distribution and biogeography of polychaetes collected from the soft bottoms of the Straits of Magellan (South America) in February-March 1991 are reported. In 16 benthic samples, collected with different tools (Charcot and triangular dredges, van Veen grab), a total of 1132 individuals belonging to 119 taxa of polychaetes were collected; only 49 of the taxa found have been determined at species level. Eighteen species were recorded for the first time in the Straits of Magellan. Species richness was relatively high considering both the number of individuals collected, and the taxa known from previous studies on the area (182 species). The biogeographical analysis, conducted only on the 49 taxa classified at the species level, showed the dominance of Magellan-Antarctic-Subantarctic species (M-An-S 50%), followed by Magellan-American (M-Am 14%), Magellan-Antarctic (M-An 12%), Magellan-Subantarctic (M-S 6%), Cosmopolitans (C 10%), and also by a few species with disjunct distribution (D 8%). Values of the Sørensen similarity index among stations were very low (below 0.30) with a few exceptions. Both number of species and of individuals were higher in the Atlantic sector of the Straits, especially at some stations characterized by heterogeneous mixed sediments (gravels and pebbles) and biogenic debris (mollusc thanatocoenosis). The high number of species recorded, coupled with low similarity values among stations, suggests that the soft bottoms of the Straits of Magellan show, at medium scale, a highly diversified mosaic of different biotopes. This can be due to various factors which are expected to vary along the wide geographic area investigated, such as the wide bathymetric range sampled, the type of sampling gears used, and last but not least the occurrence of many different environmental situations along the Straits. |
format |
Article in Journal/Newspaper |
author |
María Cristina Gambi Simone Mariani |
author_facet |
María Cristina Gambi Simone Mariani |
author_sort |
María Cristina Gambi |
title |
Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 |
title_short |
Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 |
title_full |
Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 |
title_fullStr |
Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 |
title_full_unstemmed |
Polychaetes of the soft bottoms of the Straits of Magellan collected during the Italian oceanographic cruise in February-March 1991 |
title_sort |
polychaetes of the soft bottoms of the straits of magellan collected during the italian oceanographic cruise in february-march 1991 |
publisher |
Consejo Superior de Investigaciones Científicas |
publishDate |
1999 |
url |
https://doi.org/10.3989/scimar.1999.63s1233 https://doaj.org/article/183954d46a4142319911e2d2dbdaa763 |
long_lat |
ENVELOPE(139.017,139.017,-69.367,-69.367) ENVELOPE(161.900,161.900,-71.583,-71.583) |
geographic |
Antarctic Charcot Van Veen |
geographic_facet |
Antarctic Charcot Van Veen |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Scientia Marina, Vol 63, Iss S1, Pp 233-242 (1999) |
op_relation |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/908 https://doaj.org/toc/0214-8358 https://doaj.org/toc/1886-8134 0214-8358 1886-8134 doi:10.3989/scimar.1999.63s1233 https://doaj.org/article/183954d46a4142319911e2d2dbdaa763 |
op_doi |
https://doi.org/10.3989/scimar.1999.63s1233 |
container_title |
Scientia Marina |
container_volume |
63 |
container_issue |
S1 |
container_start_page |
233 |
op_container_end_page |
242 |
_version_ |
1766256515325362176 |