{"created":"2023-06-19T12:47:07.620614+00:00","id":7260,"links":{},"metadata":{"_buckets":{"deposit":"bed911d1-d0b7-4c62-917e-c7b474cb11aa"},"_deposit":{"created_by":3,"id":"7260","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"7260"},"status":"published"},"_oai":{"id":"oai:tokyo-metro-u.repo.nii.ac.jp:00007260","sets":["465:475:478:479:1642"]},"author_link":["23607","23605","23604","23606"],"item_16_alternative_title_19":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Diversity in land snail communities on Minami-Iwo-To Island"}]},"item_16_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2018-07","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"44","bibliographicPageEnd":"330","bibliographicPageStart":"315","bibliographic_titles":[{"bibliographic_title":"小笠原研究 = Ogasawara research"}]}]},"item_16_creator_3":{"attribute_name":"著者別名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Wada, Shinichiro"}],"nameIdentifiers":[{"nameIdentifier":"23606","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Chiba, Satoshi"}],"nameIdentifiers":[{"nameIdentifier":"23607","nameIdentifierScheme":"WEKO"}]}]},"item_16_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"2017年6月に南硫黄島の陸産貝類の調査を行なった。調査によって得られた新しい知見に基づいて種構成の見直しを行い、イオウジマノミガイなど新記録種を含めて合計14種を見出した。今回新たに記録された種のうち、リュウキュウノミガイ属の1種は、未記載の固有種と考えられる。島の地点ごとの標高に対して陸貝が示す種多様性の勾配パターンは、中間の標高で最大になるというベル型を示した。これは他の地域から南硫黄島に移住定着した種が、その故郷の生息環境と類似した環境にかなり限定されて分布する結果であると考えられる。実際、頂上を中心として高標高の地点には、北ユーラシアに分布の中心をもつ北方系の種が優占し、低標高の地点には熱帯太平洋系の種が優占していた。小笠原群島の島に比べて、島が形成されてから時間を経ていないために、種の分布が祖先集団から引き継いだ生息環境への選好性に強く制約されていると考えられる。地上性、樹上性といった生活形についても、多くの種は他地域の集団や近縁種と違いを示していなかったが、コダマキバサナギガイは、北海道の祖先集団に対し、劇的なニッチの拡大と形態の多様化を示した。またエリマキガイは、低い標高の地点で地上性から樹上性へのニッチシフトを生じていた。同じ島で、種によりニッチ保守性の違いを生じている要因や、ニッチ分化を生じているプロセスの解明は、今後の課題である。なおコダマキバサナギガイには生殖腺に多型があり、他個体と交配するタイプと自殖するタイプが含まれていた。この多型の存在が、島への定着や多様化とどのように関わるのかを解明することは今後の課題である。なお今回、南硫黄島の陸貝の生息密度などの状況は、前回の調査時とは大きく異なっていた。群集構成や密度が時間的に大きく変動している可能性があり、今後の長期的な視野に基づく調査が望まれる。","subitem_description_type":"Abstract"},{"subitem_description":"A survey of land Mollusca on Minami-Iwo-To Island was conducted in June 2017. Information on land snail fauna was revised and 14 species were recorded. Among these species, Lamellidea sp. seems to be a new species endemic to the island. A graph of species diversity in relation to the altitude of the survey sites exhibited a humpshaped curve, supporting the hypothesis of mid-domain effects, with individual species distributed within a limited range of altitudes and showing niche conservatism. Species derived from northern Eurasia dominated at high altitude sites, while those from the tropical Pacific were observed at low altitude sites. Although many of the observed species showed niche conservatism in terms of habitat use, Vertigo kodamai showed expanded habitat use on the island, and V. dedecola showed habitat shifts at low altitudes. These patterns may reflect the initial stages of adaptive divergence of these species. Polymorphisms in genital morphology, including aphallism and euphallism, were found in V. kodamai populations, suggesting that reproductive traits potentially contribute to the success of long distance dispersal and extension of habitat use. Characteristics of snail populations (e.g., density) observed in the present survey were largely different from those seen in previous surveys, implying temporal changes in the structure and composition of the island snail community on the island.","subitem_description_type":"Abstract"}]},"item_16_description_40":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"postprint","subitem_description_type":"Other"}]},"item_16_publisher_33":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"首都大学東京小笠原研究委員会"}]},"item_16_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00032332","subitem_source_identifier_type":"NCID"}]},"item_16_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03868176","subitem_source_identifier_type":"ISSN"}]},"item_16_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":"和田, 慎一郎"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"千葉, 聡"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-03-13"}],"displaytype":"detail","filename":"20001-044-015.pdf","filesize":[{"value":"2.2 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"20001-044-015.pdf","url":"https://tokyo-metro-u.repo.nii.ac.jp/record/7260/files/20001-044-015.pdf"},"version_id":"6a9f37c1-04e5-4efa-9b26-270d83d5b09d"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"小笠原諸島","subitem_subject_scheme":"Other"},{"subitem_subject":"火山列島","subitem_subject_scheme":"Other"},{"subitem_subject":"環境勾配","subitem_subject_scheme":"Other"},{"subitem_subject":"進化","subitem_subject_scheme":"Other"},{"subitem_subject":"適応","subitem_subject_scheme":"Other"},{"subitem_subject":"Adaptation","subitem_subject_scheme":"Other"},{"subitem_subject":"Environmental gradient","subitem_subject_scheme":"Other"},{"subitem_subject":"Evolution","subitem_subject_scheme":"Other"},{"subitem_subject":"Kazan Islands","subitem_subject_scheme":"Other"},{"subitem_subject":"Ogasawara Islands","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"南硫黄島の陸産貝類群集の多様性","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"南硫黄島の陸産貝類群集の多様性"}]},"item_type_id":"16","owner":"3","path":["1642"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-03-15"},"publish_date":"2019-03-15","publish_status":"0","recid":"7260","relation_version_is_last":true,"title":["南硫黄島の陸産貝類群集の多様性"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-06-19T16:19:25.261591+00:00"}