Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions
The Southern Ocean has been intensively studied in recent decades with respect to the biogeography of marine invertebrates. Biological limitations, the geological history of Antarctica and South America, and oceanographic features of the Drake Passage potentially limit species connectivity between S...
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ftcdlib:qt85f018w3 2023-05-15T13:46:20+02:00 Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions Naretto Atlagic, Javier 2012-04-01 application/pdf http://www.escholarship.org/uc/item/85f018w3 english eng eScholarship, University of California qt85f018w3 http://www.escholarship.org/uc/item/85f018w3 public Naretto Atlagic, Javier. (2012). Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions. UC San Diego: Center for Marine Biodiversity and Conservation. Retrieved from: http://www.escholarship.org/uc/item/85f018w3 Life Sciences Distribution patterns marine biodiversity zonation of species marine invertebrate biogeography Scotia Arc Antarctic Peninsula Southern Ocean biodiversity South American biodiversity Drake Passage species connectivity larval transport drifting communities benthic marine invertebrates marine species distributions benthic mollusk species presence absence studies article 2012 ftcdlib 2018-02-16T23:52:12Z The Southern Ocean has been intensively studied in recent decades with respect to the biogeography of marine invertebrates. Biological limitations, the geological history of Antarctica and South America, and oceanographic features of the Drake Passage potentially limit species connectivity between South America and the Antarctic Peninsula. However, there are many proposed occurrences of the same marine invertebrate species being found both in Antarctica and South America. This overlap of fauna has been explained by: (1) larval transport or drifting/rafting communities from one continent to the other, (2) the partly emergent Scotia Arc acting as a series of connective “stepping stones” or (3) poor taxonomy, i.e., cryptic species or poor identifications. None of these hypotheses has been systematically tested for benthic marine invertebrates. The present study assessed the presence of shared benthic mollusk species in Antarctica, South America, and the Scotia Arc by using species absence and presence in the area. Six percent of the Southern Ocean benthic mollusk biodiversity was shared between the three regions, and three quarters of these shared species showed signs of connectivity between 0 and 1000 m. Sixty five percent of the shared species were considered to show eurybathy (depth distribution broader than 1000 m depth ranges). This low, but not insignificant number of shared species from South American and the Antarctic Peninsula show signs of connectivity through the Scotia Arc, and that connectivity is mainly, but not exclusively achieved through the first 1000 m depth. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Southern Ocean Stepping Stones University of California: eScholarship Antarctic Antarctic Peninsula Drake Passage Southern Ocean Stepping Stones ENVELOPE(-63.992,-63.992,-64.786,-64.786) The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Life Sciences Distribution patterns marine biodiversity zonation of species marine invertebrate biogeography Scotia Arc Antarctic Peninsula Southern Ocean biodiversity South American biodiversity Drake Passage species connectivity larval transport drifting communities benthic marine invertebrates marine species distributions benthic mollusk species presence absence studies |
spellingShingle |
Life Sciences Distribution patterns marine biodiversity zonation of species marine invertebrate biogeography Scotia Arc Antarctic Peninsula Southern Ocean biodiversity South American biodiversity Drake Passage species connectivity larval transport drifting communities benthic marine invertebrates marine species distributions benthic mollusk species presence absence studies Naretto Atlagic, Javier Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions |
topic_facet |
Life Sciences Distribution patterns marine biodiversity zonation of species marine invertebrate biogeography Scotia Arc Antarctic Peninsula Southern Ocean biodiversity South American biodiversity Drake Passage species connectivity larval transport drifting communities benthic marine invertebrates marine species distributions benthic mollusk species presence absence studies |
description |
The Southern Ocean has been intensively studied in recent decades with respect to the biogeography of marine invertebrates. Biological limitations, the geological history of Antarctica and South America, and oceanographic features of the Drake Passage potentially limit species connectivity between South America and the Antarctic Peninsula. However, there are many proposed occurrences of the same marine invertebrate species being found both in Antarctica and South America. This overlap of fauna has been explained by: (1) larval transport or drifting/rafting communities from one continent to the other, (2) the partly emergent Scotia Arc acting as a series of connective “stepping stones” or (3) poor taxonomy, i.e., cryptic species or poor identifications. None of these hypotheses has been systematically tested for benthic marine invertebrates. The present study assessed the presence of shared benthic mollusk species in Antarctica, South America, and the Scotia Arc by using species absence and presence in the area. Six percent of the Southern Ocean benthic mollusk biodiversity was shared between the three regions, and three quarters of these shared species showed signs of connectivity between 0 and 1000 m. Sixty five percent of the shared species were considered to show eurybathy (depth distribution broader than 1000 m depth ranges). This low, but not insignificant number of shared species from South American and the Antarctic Peninsula show signs of connectivity through the Scotia Arc, and that connectivity is mainly, but not exclusively achieved through the first 1000 m depth. |
format |
Article in Journal/Newspaper |
author |
Naretto Atlagic, Javier |
author_facet |
Naretto Atlagic, Javier |
author_sort |
Naretto Atlagic, Javier |
title |
Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions |
title_short |
Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions |
title_full |
Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions |
title_fullStr |
Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions |
title_full_unstemmed |
Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions |
title_sort |
mollusks from southern south america, the scotia arc and the antarctic peninsula; assessing connectivity among these regions |
publisher |
eScholarship, University of California |
publishDate |
2012 |
url |
http://www.escholarship.org/uc/item/85f018w3 |
long_lat |
ENVELOPE(-63.992,-63.992,-64.786,-64.786) |
geographic |
Antarctic Antarctic Peninsula Drake Passage Southern Ocean Stepping Stones The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Drake Passage Southern Ocean Stepping Stones The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Southern Ocean Stepping Stones |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Southern Ocean Stepping Stones |
op_source |
Naretto Atlagic, Javier. (2012). Mollusks from Southern South America, the Scotia Arc and the Antarctic Peninsula; Assessing Connectivity Among these Regions. UC San Diego: Center for Marine Biodiversity and Conservation. Retrieved from: http://www.escholarship.org/uc/item/85f018w3 |
op_relation |
qt85f018w3 http://www.escholarship.org/uc/item/85f018w3 |
op_rights |
public |
_version_ |
1766240626828902400 |