音響手法を用いた来留見ノ瀬周辺におけるガラモ場の分布推定 Estimation of the spatial distribution of a Sargassum bed in Kuruminose, Yamaguchi, Japan, using an acoustic method

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山口県来留見ノ瀬のガラモ場は,周辺の沿岸生態系において重要であり分布の把握が求められている。本研究は,音響手法により同海域(12 km<sup>2</sup>)のガラモ場の分布推定を試みた。推定されたガラモ場は,来留見ノ瀬から北西および南南東の方向に分布し,総面積は 1.94 km<sup>2</sup>(高さ 0.50~2.24 m)であった。特に南南東の領域の内側は繁茂しており,沿岸生態系における重要性が高いと考えられた。本手法は分布推定の有効な手段であり,現存量の広域評価なども今後に期待できると考えられた。<br>

  <i>Sargassum</i> beds play important ecological roles as nursery grounds, feeding grounds and hiding grounds for coastal fauna in Kuruminose, Yamaguchi, Japan (12 km<sup>2</sup>). In this study, we tried to estimate the spatial distribution of a <i>Sargassum</i> bed using an acoustic method. For this purpose, binarization and geostatistical methods were used. The binarization provided the optimum thresholds to separate the bottom and head of the <i>Sargassum</i> bed. The bottom threshold and the head threshold were −22.4 dB, and −56.4 dB, respectively. The horizontal distribution was interpolated every 1 m<sup>2</sup> using kriging. The area of the <i>Sargassum</i> bed was estimated to be 1.94 km<sup>2</sup>, with thickness of 0.50 to 2.24 m. The <i>Sargassum</i> bed in the south-southeast of Kuruminose was thicker and larger than that near Kuruminose, suggesting that the south-southeast <i>Sargassum</i> bed is important for the coastal ecosystem in Kuruminose. The estimated thickness and distribution corresponded with those by direct observation by diving and underwater TV camera, suggesting that acoustic measurement is adequate for estimating the spatial distribution of <i>Sargassum</i> beds.<br>

収録刊行物

  • 日本水産學會誌 = Bulletin of the Japanese Society of Scientific Fisheries

    日本水産學會誌 = Bulletin of the Japanese Society of Scientific Fisheries 78(2), 171-179, 2012-03-15

    日本水産學會

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各種コード

  • NII論文ID(NAID)
    10030123731
  • NII書誌ID(NCID)
    AN00193422
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00215392
  • NDL 記事登録ID
    023599594
  • NDL 請求記号
    Z18-345
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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