{"created":"2021-03-01T06:43:28.568374+00:00","id":25510,"links":{},"metadata":{"_buckets":{"deposit":"129a3c7c-af8e-4ab7-af3a-1a76605a5658"},"_deposit":{"id":"25510","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25510"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025510","sets":["27:2466:2467:2575","9:504:2469:2576"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Interrelationship between Feeding Condition and Density of the Grass Spider, Agelena opulenta"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1991","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"8","bibliographicPageStart":"1","bibliographicVolumeNumber":"83","bibliographic_titles":[{"bibliographic_title":"東京大学農学部演習林報告"}]}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"造網性のクモであるコクサグモについて餌条件の重要性を評価するために，室内飼育と野外実験を行った。室内飼育ではクモを飽食と絶食の2つのグループに分けて飼育し，野外で採集したクモの背甲長および体重と比較した。その結果，野外のクモの成長は餌条件によって制限されていることが判明した。野外実験では，餌となるショウジョウバエを与えて餌条件を向上させた区と自然状態のまま放置した区についてそれぞれ高密度区と低密度区の2種類を設けて個体数および体長の経時変化を調査した。その結果，餌の付加区では生存率（移出入を含む）が有意に向上した。また，餌の付加区の個体はサイズが大きくなる傾向があった。一方，餌を付加しない高密度区と低密度区で餌の摂食頻度を調査したところ，両者の間には差がみられず，餌をめぐる種内競争は検出し得なかった。以上の結果から，コクサグモ個体群において餌条件はcontrolling factorではあるが，regulating factorとはなりえないと考えられる。","subitem_description_type":"Abstract"},{"subitem_description":"Field experiment and laboratory rearing were conducted to evaluate the importance of feeding conditions on the population of the grass spider, Agelena opulenta. In laboratory, spiders were reared under two levels of food supply, satiation and starvation. The carapace width and body weight were measured at the end of the rearings, which were compared with those of field-collected specimens. It was found that the growth of spiders in the field was limited by food. In the field experiment, four types of subpopulations were established by manipulating the density and adding food for spiders. Each of them differed in initial density and/or food level. Survival rate (including immigration and emigration) was significantly improved and body size tended to be larger at the food supplemented subpopulations. Feeding frequency of spiders obtained by sight-count method revealed that it did not differ significantly between high and low density subpopulations which received no additional food, indicating that competition for food was absent. These results suggest that food is indeed a controlling factor but not a regulating factor for this spider population.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"55142","nameIdentifierScheme":"WEKO"}],"names":[{"name":"MIYASHITA, Tadashi"}]}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学大学院農学生命科学研究科附属演習林"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162451","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03716007","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"610","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"The Tokyo University Forests"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学農学部森林動物学教室"},{"subitem_text_value":"Laboratory of Forest Zoology, Faculty of Agriculture, The University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"宮下, 直"}],"nameIdentifiers":[{"nameIdentifier":"55141","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-09"}],"displaytype":"detail","filename":"esrh083001.pdf","filesize":[{"value":"509.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh083001.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25510/files/esrh083001.pdf"},"version_id":"ae585b7c-cdcd-4ce0-b985-3cf22e3e8261"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"コクサグモ","subitem_subject_scheme":"Other"},{"subitem_subject":"餌条件","subitem_subject_scheme":"Other"},{"subitem_subject":"個体群密度","subitem_subject_scheme":"Other"},{"subitem_subject":"餌をめぐる競争","subitem_subject_scheme":"Other"},{"subitem_subject":"grass spider","subitem_subject_scheme":"Other"},{"subitem_subject":"food limitation","subitem_subject_scheme":"Other"},{"subitem_subject":"population density","subitem_subject_scheme":"Other"},{"subitem_subject":"competition for food","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":"コクサグモにおける餌条件と密度の相互関係","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"コクサグモにおける餌条件と密度の相互関係"}]},"item_type_id":"4","owner":"1","path":["2576","2575"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-09-03"},"publish_date":"2014-09-03","publish_status":"0","recid":"25510","relation_version_is_last":true,"title":["コクサグモにおける餌条件と密度の相互関係"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:03:43.969856+00:00"}