{"created":"2023-07-25T09:58:51.806764+00:00","id":2016,"links":{},"metadata":{"_buckets":{"deposit":"3c6f1541-638f-4caf-921a-7c158547a0bf"},"_deposit":{"created_by":15,"id":"2016","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"2016"},"status":"published"},"_oai":{"id":"oai:oacis.repo.nii.ac.jp:00002016","sets":["187:191:479","41:318"]},"author_link":["1564"],"item_3_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2017-12","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"6","bibliographicPageEnd":"941","bibliographicPageStart":"914","bibliographicVolumeNumber":"83","bibliographic_titles":[{"bibliographic_title":"日本水産学会誌"},{"bibliographic_title":"Nippon Suisan Gakkaishi","bibliographic_titleLang":"en"}]}]},"item_3_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Harvests of the Asari clam Ruditapes philippinarum have drastically decreased in Japan since the mid-1980s. In this article, I review the discussions of the facts and factors surrounding the decrease of clam populations in five major clam harvesting areas (Tokyo Bay, Mikawa Bay, Ise Bay, Suo-Nada, and Ariake Bay) in Japan. Reclamation and over-harvesting directly decreased the standing stock of the clam in many areas. Over-harvesting, however, is unlikely to be responsible for the long-standing low stock levels, because strict harvesting regulations after the clam numbers decreased seldom enabled clam production levels to recover. Effects of hypoxic water, river flushing, erosion by strong winter waves, immigration of new predators, and outbreak of parasites have exacerbated the clam population decrease in recent years, but it is uncertain whether these factors were applicable in the 1980s. The past decrease and present failure to recover may not be attributable to the same causative factors. In this review, I outline two recommendations for future discussions. Firstly, discussions should be targeted clearly at decreases during a specific period because clam harvests can be affected by multiple factors with different timing and duration. Secondly, discussions should be carried out in a multidisciplinary manner for comparative analyses."},{"subitem_description":"1980年代以降の我が国のアサリ漁獲量の減少について，主要5海域の実態と原因に関する議論を再点検した。減少には埋め立てと乱獲が関与した可能性があったが，貧酸素，河川出水，冬季の波浪減耗，食害生物，病虫害，餌料環境等の関与が指摘され，最終的に原因が特定されている海域はなかった。漁獲量に影響する要因は時間とともに変化しているため，過去の減少と現在の回復不全の要因は異なる可能性があり，減少時期を特定した議論が重要と思われた。原因の特定には各要因の影響を定量的に評価した上での比較検討が必要であろう。"}]},"item_3_publisher_32":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"日本水産学会"}]},"item_3_relation_11":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://doi.org/10.2331/suisan.17-00007","subitem_relation_type_select":"DOI"}}]},"item_3_relation_13":{"attribute_name":"情報源","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"Publisher's Version/PDF (Open Access)"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://doi.org/10.2331/suisan.17-00007","subitem_relation_type_select":"DOI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"日本水産学会 "}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://jsfs.jp/","subitem_relation_type_select":"URI"}}]},"item_3_relation_28":{"attribute_name":"論文ID（NAID）","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"130006267684","subitem_relation_type_select":"NAID"}}]},"item_3_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0021-5392","subitem_source_identifier_type":"ISSN"}]},"item_3_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00193422","subitem_source_identifier_type":"NCID"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"鳥羽, 光晴"}],"nameIdentifiers":[{}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"アサリ","subitem_subject_scheme":"Other"},{"subitem_subject":"漁獲量","subitem_subject_scheme":"Other"},{"subitem_subject":"減少","subitem_subject_scheme":"Other"},{"subitem_subject":"変動要因","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":"journal article"}]},"item_title":"アサリ資源の減少に関する議論への再訪","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"アサリ資源の減少に関する議論への再訪"},{"subitem_title":"Revisiting recent decades of conflicting discussions on the decrease of Asari clam Ruditapes philippinarum in Japan: A review","subitem_title_language":"en"}]},"item_type_id":"3","owner":"15","path":["318","479"],"pubdate":{"attribute_name":"公開日","attribute_value":"2020-10-29"},"publish_date":"2020-10-29","publish_status":"0","recid":"2016","relation_version_is_last":true,"title":["アサリ資源の減少に関する議論への再訪"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-07-25T10:37:37.669572+00:00"}