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Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans
BACKGROUND: Observing and monitoring the underwater social interactions of cetaceans is challenging. Therefore, previous cetacean studies have monitored these interactions by surface observations. However, because cetaceans spend most of their time underwater, it is important that their underwater b...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3244420/ https://www.ncbi.nlm.nih.gov/pubmed/22216123 http://dx.doi.org/10.1371/journal.pone.0028836 |
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author | Sakai, Mai Wang, Ding Wang, Kexiong Li, Songhai Akamatsu, Tomonari |
author_facet | Sakai, Mai Wang, Ding Wang, Kexiong Li, Songhai Akamatsu, Tomonari |
author_sort | Sakai, Mai |
collection | PubMed |
description | BACKGROUND: Observing and monitoring the underwater social interactions of cetaceans is challenging. Therefore, previous cetacean studies have monitored these interactions by surface observations. However, because cetaceans spend most of their time underwater, it is important that their underwater behavior is also continuously monitored to better understand their social relationships and social structure. The finless porpoise is small and has no dorsal fin. It is difficult to observe this species in the wild, and little is known of its sociality. METHODOLOGY/PRINCIPAL FINDINGS: The swim depths of 6 free-ranging finless porpoises were simultaneously recorded using a time-synchronized bio-logging system. Synchronous diving was used as an index of association. Two pairs, #27 (an immature female estimated to be 3.5 years old) and #32 (an adult male), #28 (a juvenile male estimated to be 2 years old) and #29 (an adult male), tended to participate in long periods of synchronized diving more frequently than 13 other possible pairs, indicating that the 4 porpoises chose their social partners. The adult males (#32, #29) tended to follow the immature female (#27) and juvenile male (#28), respectively. However, during synchronized diving, the role of an initiator often changed within the pair, and their body movements appeared to be non-agonistic, e.g., rubbing of bodies against one another instead of that on one-side, as observed with chasing and escaping behaviors. CONCLUSIONS/SIGNIFICANCE: The present study employed a time-synchronized bio-logging method to observe the social relationships of free-ranging aquatic animals based on swimming depth. The results suggest that certain individuals form associations even if they are not a mother and calf pair. Long synchronized dives occurred when particular members were reunited, and this suggests that the synchronized dives were not a by-product of opportunistic aggregation. |
format | Online Article Text |
id | pubmed-3244420 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-32444202012-01-03 Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans Sakai, Mai Wang, Ding Wang, Kexiong Li, Songhai Akamatsu, Tomonari PLoS One Research Article BACKGROUND: Observing and monitoring the underwater social interactions of cetaceans is challenging. Therefore, previous cetacean studies have monitored these interactions by surface observations. However, because cetaceans spend most of their time underwater, it is important that their underwater behavior is also continuously monitored to better understand their social relationships and social structure. The finless porpoise is small and has no dorsal fin. It is difficult to observe this species in the wild, and little is known of its sociality. METHODOLOGY/PRINCIPAL FINDINGS: The swim depths of 6 free-ranging finless porpoises were simultaneously recorded using a time-synchronized bio-logging system. Synchronous diving was used as an index of association. Two pairs, #27 (an immature female estimated to be 3.5 years old) and #32 (an adult male), #28 (a juvenile male estimated to be 2 years old) and #29 (an adult male), tended to participate in long periods of synchronized diving more frequently than 13 other possible pairs, indicating that the 4 porpoises chose their social partners. The adult males (#32, #29) tended to follow the immature female (#27) and juvenile male (#28), respectively. However, during synchronized diving, the role of an initiator often changed within the pair, and their body movements appeared to be non-agonistic, e.g., rubbing of bodies against one another instead of that on one-side, as observed with chasing and escaping behaviors. CONCLUSIONS/SIGNIFICANCE: The present study employed a time-synchronized bio-logging method to observe the social relationships of free-ranging aquatic animals based on swimming depth. The results suggest that certain individuals form associations even if they are not a mother and calf pair. Long synchronized dives occurred when particular members were reunited, and this suggests that the synchronized dives were not a by-product of opportunistic aggregation. Public Library of Science 2011-12-21 /pmc/articles/PMC3244420/ /pubmed/22216123 http://dx.doi.org/10.1371/journal.pone.0028836 Text en Sakai et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Sakai, Mai Wang, Ding Wang, Kexiong Li, Songhai Akamatsu, Tomonari Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans |
title | Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans |
title_full | Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans |
title_fullStr | Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans |
title_full_unstemmed | Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans |
title_short | Do Porpoises Choose Their Associates? A New Method for Analyzing Social Relationships among Cetaceans |
title_sort | do porpoises choose their associates? a new method for analyzing social relationships among cetaceans |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3244420/ https://www.ncbi.nlm.nih.gov/pubmed/22216123 http://dx.doi.org/10.1371/journal.pone.0028836 |
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