Vertical Distribution and Seasonal Variation of Eelgrass Bed in Iwachi Bay, Izu Peninsula, Japan.

• Hayashida Fumio

Bibliographic Information

Other Title

• 伊豆半島・岩地湾におけるアマモ群落の垂直分布と季節変動について
• イズ ハントウ イワチワン ニ オケル アマモ グンラク ノ スイチョク ブンプ ト キセツ ヘンドウ ニ ツイテ

Abstract

The vertical distribution of an eelgrass bed was surveyed in Iwachi Bay, the Pacific coast of central Japan. Samplings were conducted from May to November in 1977 using SCUBA. Eelgrasses were distributed at the depth of 3 to 11m. The lower limit of the bed at 12m is probably due to the low light intensity at that depth relative to the surface. Nevertheless, the plants showed good growth at 7-10m depth, which is comparatively deeper than other eelgrass habitation in Japan. Highest population density (290 shoots/m²) was observed in September and fresh weight of biomass (888g/m²) was highest in July at 7m depth. The ratio of reproductive shoots to the total shoots was also highest at the aforementioned depth which was about 36% in June. The maximum value of the mean leaf area index was about 3 at 10m depth in July. It was then considered that the high values of water transparency and solar radiation, and longer sunshine duration compared with the other localities contributed to the growth of eelgrass in deeper waters in Iwachi Bay.

Journal

• NIPPON SUISAN GAKKAISHI

  NIPPON SUISAN GAKKAISHI 66 (2), 212-220, 2000

  The Japanese Society of Fisheries Science

Keywords

• 海草類
• アマモ群落
• 駿河湾
• 垂直分布

Details

• CRID: 1390001206412169344
• NII Article ID: 110003145004
• NII Book ID: AN00193422
• DOI: 10.2331/suisan.66.212
• ISSN: 1349998X
• ISSN: 00215392
• ISSN: http://id.crossref.org/issn/00215392
• NDL BIB ID: 5325582
• Web Site: https://agriknowledge.affrc.go.jp/RN/2010610391
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5325582
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/11075267
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • NDL-Digital
  • CiNii Articles
• Abstract License Flag: Disallowed