BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS
table.MsoNormalTable { font-size: 10pt; font-family: "Times New Roman","serif"; } The latitudinal diversity gradient is widely recognized, leading researchers to assume that Antarctic fauna are impoverished. However, with increased sampling efforts, some studies have shown a grea...
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ftufriodejaneiro:oai:ojs.pkp.sfu.ca:article/8115 2024-09-15T17:42:15+00:00 BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS Fortes, Rafael Da Rocha Absalão, Ricardo Silva 2017-02-20 application/pdf https://revistas.ufrj.br/index.php/oa/article/view/8115 por por Associação Brasileira de Ciência Ecológica e Conservação (ABECO) https://revistas.ufrj.br/index.php/oa/article/view/8115/6574 https://revistas.ufrj.br/index.php/oa/article/view/8115 Copyright (c) 2017 Oecologia Australis Oecologia Australis; v. 15 n. 1 (2011): Antarctic ~ South American Interactions in the Marine Environment (ASAI); 111-123 Oecologia Australis; Vol. 15 No. 1 (2011): Antarctic ~ South American Interactions in the Marine Environment (ASAI); 111-123 2177-6199 Biogeography Diversity Gradient Rapoport´s Rule Antarctic Marine Mollusca info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftufriodejaneiro 2024-06-24T04:23:30Z table.MsoNormalTable { font-size: 10pt; font-family: "Times New Roman","serif"; } The latitudinal diversity gradient is widely recognized, leading researchers to assume that Antarctic fauna are impoverished. However, with increased sampling efforts, some studies have shown a great diversity of certain marine groups surrounding the Antarctic continent, with higher rates of them. Antarctic endemism may be associated with its isolation and climate change over the evolutionary time scale. Despite this relative isolation, recent evidence suggests some degree of connectivity between the Antarctic and South American faunas. Our study used secondary data extracted from Malacolog 4.1.1. The geographical area considered was the entire South American Atlantic coast and the the adjacent areas of the Antarctic (Antarctic Peninsula, part of the Weddell Sea and islands of the Scotia Arc). Our survey yielded 6517 species of mollusks. The most diverse province was the North Brazil Shelf, and the least diverse was the Scotia Sea. Endemism rates for low-latitude provinces were close to 15%, in contrast to the highest endemism rate of 40% in the Scotia Sea Province. The highest value for richness was found for the Guianan ecoregion, and the lowest value for the Antarctic Peninsula. Most ecoregions had an endemism rate around 3%, with the highest endemism in South Georgia. The richness gradient increased toward lower latitudes. The cluster analysis for the malacofauna indicated four statistically significant groups. The bathymetric Rapoport´s Rule showed the increase of bathymetric range toward higher-latitude ecoregions and whereas Bergmann´s Rule showed the opposite relationship. The higher richness at -25oS may be associated with the presence of coral and calcareous algal reefs. At mid-latitudes richness was also high, and this region comprise an ecotone between thermophilic and cryophilic species'. The cluster analysis validated three provinces proposed by Spalding (2007), although it revealed the inadequate knowledge of the ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Scotia Sea Weddell Sea Portal de Periódicos da UFRJ (Universidade Federal do Rio de Janeiro) |
institution |
Open Polar |
collection |
Portal de Periódicos da UFRJ (Universidade Federal do Rio de Janeiro) |
op_collection_id |
ftufriodejaneiro |
language |
Portuguese |
topic |
Biogeography Diversity Gradient Rapoport´s Rule Antarctic Marine Mollusca |
spellingShingle |
Biogeography Diversity Gradient Rapoport´s Rule Antarctic Marine Mollusca Fortes, Rafael Da Rocha Absalão, Ricardo Silva BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS |
topic_facet |
Biogeography Diversity Gradient Rapoport´s Rule Antarctic Marine Mollusca |
description |
table.MsoNormalTable { font-size: 10pt; font-family: "Times New Roman","serif"; } The latitudinal diversity gradient is widely recognized, leading researchers to assume that Antarctic fauna are impoverished. However, with increased sampling efforts, some studies have shown a great diversity of certain marine groups surrounding the Antarctic continent, with higher rates of them. Antarctic endemism may be associated with its isolation and climate change over the evolutionary time scale. Despite this relative isolation, recent evidence suggests some degree of connectivity between the Antarctic and South American faunas. Our study used secondary data extracted from Malacolog 4.1.1. The geographical area considered was the entire South American Atlantic coast and the the adjacent areas of the Antarctic (Antarctic Peninsula, part of the Weddell Sea and islands of the Scotia Arc). Our survey yielded 6517 species of mollusks. The most diverse province was the North Brazil Shelf, and the least diverse was the Scotia Sea. Endemism rates for low-latitude provinces were close to 15%, in contrast to the highest endemism rate of 40% in the Scotia Sea Province. The highest value for richness was found for the Guianan ecoregion, and the lowest value for the Antarctic Peninsula. Most ecoregions had an endemism rate around 3%, with the highest endemism in South Georgia. The richness gradient increased toward lower latitudes. The cluster analysis for the malacofauna indicated four statistically significant groups. The bathymetric Rapoport´s Rule showed the increase of bathymetric range toward higher-latitude ecoregions and whereas Bergmann´s Rule showed the opposite relationship. The higher richness at -25oS may be associated with the presence of coral and calcareous algal reefs. At mid-latitudes richness was also high, and this region comprise an ecotone between thermophilic and cryophilic species'. The cluster analysis validated three provinces proposed by Spalding (2007), although it revealed the inadequate knowledge of the ... |
format |
Article in Journal/Newspaper |
author |
Fortes, Rafael Da Rocha Absalão, Ricardo Silva |
author_facet |
Fortes, Rafael Da Rocha Absalão, Ricardo Silva |
author_sort |
Fortes, Rafael Da Rocha |
title |
BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS |
title_short |
BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS |
title_full |
BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS |
title_fullStr |
BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS |
title_full_unstemmed |
BIOGEOGRAPHY AND CONNECTIVITY BETWEEN WESTERN SOUTH AMERICAN AND ANTARCTIC MARINE MOLLUSCS |
title_sort |
biogeography and connectivity between western south american and antarctic marine molluscs |
publisher |
Associação Brasileira de Ciência Ecológica e Conservação (ABECO) |
publishDate |
2017 |
url |
https://revistas.ufrj.br/index.php/oa/article/view/8115 |
genre |
Antarc* Antarctic Antarctic Peninsula Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Scotia Sea Weddell Sea |
op_source |
Oecologia Australis; v. 15 n. 1 (2011): Antarctic ~ South American Interactions in the Marine Environment (ASAI); 111-123 Oecologia Australis; Vol. 15 No. 1 (2011): Antarctic ~ South American Interactions in the Marine Environment (ASAI); 111-123 2177-6199 |
op_relation |
https://revistas.ufrj.br/index.php/oa/article/view/8115/6574 https://revistas.ufrj.br/index.php/oa/article/view/8115 |
op_rights |
Copyright (c) 2017 Oecologia Australis |
_version_ |
1810488763266105344 |