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Introduction of underwater video system for the observation of coastal macroalgal vegetation
https://doi.org/10.15083/00040774
https://doi.org/10.15083/00040774eb553750-28ab-435c-be83-134a72a467c0
名前 / ファイル | ライセンス | アクション |
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KJ00004354605.pdf (1.3 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2007-04-05 | |||||
タイトル | ||||||
タイトル | Introduction of underwater video system for the observation of coastal macroalgal vegetation | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | macroalgae | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | GPS | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | abundance | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | underwater video | |||||
主題Scheme | Other | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/00040774 | |||||
ID登録タイプ | JaLC | |||||
著者 |
Hayashizaki, Ken-Ichi
× Hayashizaki, Ken-Ichi× Ogawa, Hisao |
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著者所属 | ||||||
著者所属 | School of Fisheries Sciences, Kitasato University | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 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. | |||||
書誌情報 |
Coastal marine science 巻 30, 号 1, p. 196-200, 発行日 2006-04-28 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 13493000 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11957899 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
日本十進分類法 | ||||||
主題 | 452 | |||||
主題Scheme | NDC | |||||
出版者 | ||||||
出版者 | International Coastal Research Center, Ocean Research Institute, the University of Tokyo | |||||
出版者別名 | ||||||
東京大学海洋研究所国際沿岸海洋研究センター |