{"created":"2021-03-01T07:00:27.225533+00:00","id":40783,"links":{},"metadata":{"_buckets":{"deposit":"c5b0a2c7-4ed1-4dff-8ba3-94a720d9ed04"},"_deposit":{"id":"40783","owners":[],"pid":{"revision_id":0,"type":"depid","value":"40783"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00040783","sets":["40:6494:7162:7200:7204","9:504:7165:7202:7205"]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2006-04-28","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"200","bibliographicPageStart":"196","bibliographicVolumeNumber":"30","bibliographic_titles":[{"bibliographic_title":"Coastal marine science"}]}]},"item_4_description_13":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Benthic vegetation has important roles in coastal ecosystems. Vegetation analysis and biomass estimation are urgently required for proper utilization and conservation of coastal area and also for sustainable fisheries. Although remote sensing methods such as aerial photography and satellite imaging give us efficient ways for vegetation mapping on wide area, these methods are limited to shallow and flat bottom waters where seagrasses mainly occur. For macroalgae, predominant on rocky littoral and sub-littoral zones, direct visual observation with SCUBA has been used. The accuracy of species identification is expected to be high, but the time consuming procedures result in limited coverage of area. To overcome the limitation we have developed a monitoring system for seaweed vegetation in conjunction with underwater video, GPS and depth sounder. Although limited resolution of the image might affect the accuracy of species identification, the synchronized recordings of video image and three-dimensional positioning of vegetation enabled quick monitoring to cover certain spread of area. It was possible to deploy the system in different ways, from traditional quadrat placement on transect line, to serial towing, so that the diversity of species and bottom environments could be adequately observed. Bathymetry and monitoring of bottom substrate and invertebrates were also enabled with the system. For the effective extraction of information from observation and also aimed to improve the accuracy of biomass estimation, we developed a numerical analysis using generalized additive models (GAMs). The two distinctive properties of GAMs analysis, constraint free smoothing and model selection by AIC, enabled versatile modeling of macroalgae distribution in direct/indirect association with environmental factors. Together with categorization by life forms of macroalgae, it was possible to deduce a possible vegetation pattern and a numerical prediction of standing stock biomass for each category even from small samplesized quadrat observations. The application of this system in the Otsuchi bay, Tohoku districts, Japan was introduced, and further expansion of the methods to include tropical waters were discussed.","subitem_description_type":"Abstract"}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/00040774","subitem_identifier_reg_type":"JaLC"}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"International Coastal Research Center, Ocean Research Institute, the University of Tokyo"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA11957899","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"13493000","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"452","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"東京大学海洋研究所国際沿岸海洋研究センター"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"School of Fisheries Sciences, Kitasato University"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Hayashizaki, Ken-Ichi"}],"nameIdentifiers":[{"nameIdentifier":"139562","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ogawa, Hisao"}],"nameIdentifiers":[{"nameIdentifier":"139563","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":"2017-06-27"}],"displaytype":"detail","filename":"KJ00004354605.pdf","filesize":[{"value":"1.3 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"KJ00004354605.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/40783/files/KJ00004354605.pdf"},"version_id":"f6ece68d-4d74-4ee7-a772-0a94e1a277b9"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"macroalgae","subitem_subject_scheme":"Other"},{"subitem_subject":"GPS","subitem_subject_scheme":"Other"},{"subitem_subject":"abundance","subitem_subject_scheme":"Other"},{"subitem_subject":"underwater video","subitem_subject_scheme":"Other"}]},"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":"Introduction of underwater video system for the observation of coastal macroalgal vegetation","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Introduction of underwater video system for the observation of coastal macroalgal vegetation"}]},"item_type_id":"4","owner":"1","path":["7205","7204"],"pubdate":{"attribute_name":"公開日","attribute_value":"2007-04-05"},"publish_date":"2007-04-05","publish_status":"0","recid":"40783","relation_version_is_last":true,"title":["Introduction of underwater video system for the observation of coastal macroalgal vegetation"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:16:25.326612+00:00"}