{"created":"2023-07-25T11:05:07.444614+00:00","id":8366,"links":{},"metadata":{"_buckets":{"deposit":"5db86b37-1750-434e-85d6-53c6c35295c4"},"_deposit":{"created_by":4,"id":"8366","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"8366"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00008366","sets":["1259:906:985"]},"author_link":["41","10931"],"item_1_alternative_title_5":{"attribute_name":"論文名よみ","attribute_value_mlt":[{"subitem_alternative_title":"ナンキョク オキアミ ゲンゾン リョウ ニ カンスル キホン モンダイ"}]},"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1983-09","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"54","bibliographicPageStart":"42","bibliographicVolumeNumber":"79","bibliographic_titles":[{"bibliographic_title":"南極資料"}]}]},"item_1_creator_6":{"attribute_name":"著者名(日)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"永田, 武"},{"creatorName":"ナガタ, タケシ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]}]},"item_1_creator_8":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Nagata, Takesi","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_1_description_1":{"attribute_name":"ページ属性","attribute_value_mlt":[{"subitem_description":"P(論文)","subitem_description_type":"Other"}]},"item_1_description_11":{"attribute_name":"抄録(日)","attribute_value_mlt":[{"subitem_description":"南極オキアミの存在量, 年生長率, carrying capacity, 鯨, あざらし等による年捕食量, および人間による捕獲量をそれぞれ, Z, p, Z_∞, RおよびF_kで表わすと, オキアミ生存量の年変化はdZ/dt=pZ(1-Z/Z_∞)-(R+F_k)をもって代表することができる。この式からZ=0にならないための必要条件は, (R+F_k)≦pZ_∞/4およびZ≧(Z_∞-Q)/2であることが導かれる。ここにQ≡Z_∞[1-4(R+F_k)/pZ_∞]^<1/2>である。p, Z_∞およびRの現在最も確からしい値はp=1.0/年, Z_∞=(10)^9t, R=1.1×(10)^9t/年であるが, これ等の値から, オキアミ生存量の破滅的な減少を見ないような安全捕獲量の上限は, F_k<1.1×(10)^9t/年になる。ただし, この上限量まで南極オキアミを捕獲すると, 鯨等のオキアミ捕食動物の量は増加しない。オキアミ捕獲量をこの上限値より十分少なくすれば, それだけ鯨等の生存量が増加することになる。","subitem_description_type":"Other"}]},"item_1_description_12":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"Noting biomass, annual growth-rate, carrying capacity, annual consumption rate by Antarctic animals such as whales and seals and annual catching rate by mankind of Antarctic krill by Z, p, Z_∞, R and F_k respectively, a time-change rate of Z is simply expressed by dZ/dt=pZ(1-Z/Z_∞)-(R+F_k) The critical condition for not resulting in a catastrophic vanishment of Z is given by (R+F_k)≦pZ_∞/4 and Z≧(Z_∞-Q)/2,where Q≡Z_∞[1-4(R+F_k)/pZ_∞]^<1/2>. The most plausible numerical values of p, Z_∞, and R at present will be p=1.0 (year)^<-1>, Z_∞=(10)^9 tons and R=1.1×(10)^8 tons/year. If so, F_k<1.1×(10)^8 tons/year will be the allowable upper limit for the krill catching at present. In such a case, however, an increase of whale biomass may not be expected. If F_k is considerably smaller than the critical value for (R+F_k), an increase of whale biomass can be expected.","subitem_description_type":"Other"}]},"item_1_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15094/00008366","subitem_identifier_reg_type":"JaLC"}]},"item_1_source_id_13":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AN00181831","subitem_source_identifier_type":"NCID"}]},"item_1_source_id_20":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00857289","subitem_source_identifier_type":"ISSN"}]},"item_1_subject_21":{"attribute_name":"国際十進分類法","attribute_value_mlt":[{"subitem_subject":"59(26)","subitem_subject_scheme":"UDC"}]},"item_1_text_10":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"National Institute of Polar Research"}]},"item_1_text_9":{"attribute_name":"著者所属(日)","attribute_value_mlt":[{"subitem_text_value":"国立極地研究所"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"1983-09-01"}],"displaytype":"detail","filename":"KJ00000139580.pdf","filesize":[{"value":"805.2 kB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00000139580","url":"https://nipr.repo.nii.ac.jp/record/8366/files/KJ00000139580.pdf"},"version_id":"cff3d471-8f19-4acb-aa60-b6a4b380bd4b"}]},"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":"南極オキアミ現存量に関する基本問題","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"南極オキアミ現存量に関する基本問題"},{"subitem_title":"Some basic problems in the Antarctic krill population","subitem_title_language":"en"}]},"item_type_id":"1","owner":"4","path":["985"],"pubdate":{"attribute_name":"公開日","attribute_value":"1983-09-01"},"publish_date":"1983-09-01","publish_status":"0","recid":"8366","relation_version_is_last":true,"title":["南極オキアミ現存量に関する基本問題"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T13:31:21.226354+00:00"}