{"created":"2023-07-27T04:39:25.459833+00:00","id":12042,"links":{},"metadata":{"_buckets":{"deposit":"572c2134-6d65-4cb8-91f7-90f6e23eb183"},"_deposit":{"created_by":3,"id":"12042","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"12042"},"status":"published"},"_oai":{"id":"oai:tohoku.repo.nii.ac.jp:00012042","sets":["91:155"]},"author_link":["26662"],"item_4_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1983-03-30","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicPageEnd":"A20","bibliographicPageStart":"103","bibliographicVolumeNumber":"53","bibliographic_titles":[{"bibliographic_title":"The science reports of the Tohoku University. Second series, Geology  = 東北大学理科報告. 地質学"}]}]},"item_4_date_62":{"attribute_name":"登録日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2008-05-02","subitem_date_issued_type":"Created"}]},"item_4_date_63":{"attribute_name":"公開日（投稿完了日）","attribute_value_mlt":[{"subitem_date_issued_datetime":"2008-05-02","subitem_date_issued_type":"Created"}]},"item_4_date_65":{"attribute_name":"発行日","attribute_value_mlt":[{"subitem_date_issued_datetime":"1983-03-30","subitem_date_issued_type":"Created"}]},"item_4_date_80":{"attribute_name":"更新日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2010-01-27","subitem_date_issued_type":"Created"}]},"item_4_description_15":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"In order to work out taxonomic problems of the generic assignment of Globigerina pachyderma-Globoquadrina dutertrei plexus in the light of ecology, investigations have been conducted on taxonomy and ecologic distribution of planktonic foraminifera using material collected by towing. The material was sampled through the use of simultaneous horizontal tows at two stations of the subarctic (St. 1; May 27, 1978) and perturbed areas (St. 2; June 29, 1977) off Northeast Honshu, Japan. Based on specimens from the two stations, studied are both the distribution pattern of a species in different ontogenetic stages and those of different species (intra- and interspecific distribution patterns in this paper) in water column. Each of the patterns appears to be peculiar to a water mass where foraminifera live, which are specified by the measured physicochemical properties. The daily vertical movement of foraminifera has also been inspected, particularly for G. pachyderma, using specimens collected both by the sediment traps (collector) and nets at St. 1 in the subarctic area. Laying stress on wall structure, the ontogenetic development of various forms has been detected under the scanning electron microscope. A gross shape of each species has been examined based on the population which relates to a distinct distribution pattern in water column. As a result, in the upper 200 m layer, the intra-and interspecific distribution patterns of planktonic foraminifera reflect characters of water masses sensitively even in the perturbed water mass, where the hydrographic setting is complicated due to a mixture of different water masses. The distribution patterns are basically characterized by two maximum concentration layers related to life cycles in the water column at both stations. Planktonic foraminifera descend distances of less than 50 m at night, and in the early morning, they reproduce daughters synchronously in a depth range of 150-250 m, where is the lower maximum concentration layer of the populations. After then, they put off empty shells which settle down according to a settling velocity peculiar to each species with no remarkable dispersion. Encrustation of G. pachyderma is closely connected with reproduction, and the specimens in bottom sediments appear to be mostly those after reproduction. It is quite possible, on the basis of living populations, that the left-coiled G. pachyderma belongs to the genus Globigerina, meanwhile the so-called right-coiled variety of G. pachyderma is synonymous with Globoquadrina dutertrei (d'Orbigny). They inhabit respectively different niches (water masses) and the boundary between those realms is defined by water temperatures around 8℃ at St. 2 (perturbed area). Correspondence of the position of 7.2℃ isotherm of surface water in April to the boundary between the distributions of the so-called left- and right-coiled populations of G. pachyderma in bottom sediments, as shown by Ericson (1959), can be explained by large populations and a brief turnover time of the populations of left-coiled G. pachyderma during their blooming in spring in the subpolar region.","subitem_description_type":"Abstract"}]},"item_4_description_41":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"紀要類(bulletin)","subitem_description_type":"Other"}]},"item_4_description_66":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"7979281 bytes","subitem_description_type":"Other"}]},"item_4_publisher_34":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Tohoku University"}]},"item_4_radio_69":{"attribute_name":"公開範囲","attribute_value_mlt":[{"subitem_radio_item":"学外"}]},"item_4_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0082464X","subitem_source_identifier_type":"ISSN"}]},"item_4_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA00836349","subitem_source_identifier_type":"NCID"}]},"item_4_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":"Arikawa, Ryuichi"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-02-03"}],"displaytype":"detail","filename":"KJ00004213175.pdf","filesize":[{"value":"8.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"KJ00004213175.pdf","url":"https://tohoku.repo.nii.ac.jp/record/12042/files/KJ00004213175.pdf"},"version_id":"5625539e-6c52-4aa2-9cd5-abea01abb0c3"}]},"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":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Distribution and Taxonomy of Globigerina pachyderma (Ehrenberg) off the Sanriku Coast, Northeast Honshu, Japan","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Distribution and Taxonomy of Globigerina pachyderma (Ehrenberg) off the Sanriku Coast, Northeast Honshu, Japan"}]},"item_type_id":"4","owner":"3","path":["155"],"pubdate":{"attribute_name":"公開日","attribute_value":"2008-05-02"},"publish_date":"2008-05-02","publish_status":"0","recid":"12042","relation_version_is_last":true,"title":["Distribution and Taxonomy of Globigerina pachyderma (Ehrenberg) off the Sanriku Coast, Northeast Honshu, Japan"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-07-27T16:16:45.622618+00:00"}