{"created":"2023-05-15T16:49:01.479241+00:00","id":26286,"links":{},"metadata":{"_buckets":{"deposit":"3fb167c5-bbcb-4053-8a2f-258a0b99a8ec"},"_deposit":{"created_by":6,"id":"26286","owners":[6],"pid":{"revision_id":0,"type":"depid","value":"26286"},"status":"published"},"_oai":{"id":"oai:nagasaki-u.repo.nii.ac.jp:00026286","sets":["6:7"]},"author_link":["112374","112372","112373"],"item_2_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2020-12-23","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"12","bibliographicPageStart":"e0244204","bibliographicVolumeNumber":"15","bibliographic_titles":[{"bibliographic_title":"PLOS ONE"}]}]},"item_2_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Little is known about the social structure of male sperm whales (Physeter macrocephalus) after they leave their natal units. While previous studies found no evidence for preferred associations among males, the observation of mass-strandings consisting exclusively of males, suggest that they have strong social bonds. To investigate the social associations among male sperm whales, we used half weight index of association, permutation tests and standardized lagged association rate models on a large photo-identification database collected between 2006 and 2017 in Nemuro Strait, Japan. Our results suggest that while male sperm whales are not as social as females, they do form long term associations, have preferred companionship, and forage in social proximity to each other. The best-fitting model to the standardized lagged association rate \nshowed that associations among males last for at least 2.7 years and as most males leave the area after 2 years, associations may last for longer.Twenty dyads were observed associating over more than 2 years, for a maximum 5 years. One dyad was observed associating on 19 different days and clustered on 7 different days. Male associations may function to enhance foraging or to fend off predators. Such relationships seem to be adapted to a pelagic habitat with uncertain resource availability and predation pressure.","subitem_description_type":"Abstract"}]},"item_2_description_63":{"attribute_name":"引用","attribute_value_mlt":[{"subitem_description":"PLoS ONE, 15, art.no.e0244204; 2020","subitem_description_type":"Other"}]},"item_2_publisher_33":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Public Library of Science"}]},"item_2_relation_12":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1371/journal.pone.0244204","subitem_relation_type_select":"DOI"}}]},"item_2_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"© 2020 Kobayashi et al. 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 credited."}]},"item_2_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1932-6203","subitem_source_identifier_type":"ISSN"}]},"item_2_version_type_16":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Kobayashi, Hayao"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Whitehead, Hal"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Amano, Masao"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2021-01-27"}],"displaytype":"detail","filename":"PLoS15_0244204.pdf","filesize":[{"value":"1.7 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"PLoS15_0244204.pdf ","url":"https://nagasaki-u.repo.nii.ac.jp/record/26286/files/PLoS15_0244204.pdf"},"version_id":"d0df4cb7-9382-4152-b40e-395c9637deb6"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Long-term associations among male sperm whales (Physeter macrocephalus)","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Long-term associations among male sperm whales (Physeter macrocephalus)"}]},"item_type_id":"2","owner":"6","path":["7"],"pubdate":{"attribute_name":"公開日","attribute_value":"2021-01-27"},"publish_date":"2021-01-27","publish_status":"0","recid":"26286","relation_version_is_last":true,"title":["Long-term associations among male sperm whales (Physeter macrocephalus)"],"weko_creator_id":"6","weko_shared_id":-1},"updated":"2023-05-15T22:55:03.841301+00:00"}