宮城県牡鹿半島沿岸における褐藻エゾノネジモクの生活年周期と生産力 Annual Life Cycle and Productivity of the Brown Alga Sargassum yezoense off the Coast of the Oshika Peninsula, Japan

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Author(s)

    • 吾妻 行雄 AGATSUMA Yukio
    • Laboratory of Applied Aquatic Botany, Graduate School of Agricultural Science, Tohoku University Laboratory of Applied Aquatic Botany, Graduate School of Agricultural Science, Tohoku University
    • 成田 薫 NARITA Kaoru
    • Laboratory of Applied Aquatic Botany, Graduate School of Agricultural Science, Tohoku University Laboratory of Applied Aquatic Botany, Graduate School of Agricultural Science, Tohoku University
    • 谷口 和也 TANIGUCHI Kazuya
    • Laboratory of Applied Aquatic Botany, Graduate School of Agricultural Science, Tohoku University Laboratory of Applied Aquatic Botany, Graduate School of Agricultural Science, Tohoku University

Abstract

1997年6月から1998年11月に, 宮城県牡鹿半島泊浜沿岸潮下帯の褐藻エゾノネジモク群落の生活年周期と生産力を調べた。生活年周期は, 8月から11月にかけて, 枯死脱落にともない現存量と主枝長が年間最低となるのに対して, 10cm未満の主枝が増加する発芽期, 10月ないし12月から6月にかけて, 現存量の上昇と主枝の伸長ならびに乾重量/湿重量の比が低下する伸長期, そして, 6月から8月にかけて, 10cm以上の主枝で長い順から集中的に成熟する成熟期の3期に分けられた。年間純生産量は層別刈り取り法によって903.99/m<SUP>2</SUP>と推定された。エゾノネジモク群落は, 光の到達によって下層の現存量が大きいイネ科草本型生産構造を示すので, 上層の欠如に対し, 季節を問わず発芽して速やかにギャップを埋めて群落を維持すると考えられた。

The annual life cycle and productivity of the brown alga <I>Sargassum yezoense</I> (Yamada) Yoshida et T. Konno (Sargassaceae, Fucales) were investigated in populations at Tomari-hama on the Oshika Peninsula from May 1997 to November 1998. The annual life cycle was characterized by the following three stages: 1) germination period during August to November, when the standing crop and length of main branches were at minimum and the main branches<10 cm in length increased in number, 2) the growth period during October or December to June, when the standing crop increased due to elongation of the main branches, and the ratio of dry to wet weight decreased, 3) the reproductive maturation period occurred during June to August, when the larger-sized main branches (>10 cm) matured in sequence. The annual net production estimated by the stratified clip technique was 903.9 g/m<SUP>2</SUP>. Since the productive structure of S. <I>yezoense</I> is similar to that of grass type, of which standing crop is much at lower strata of the thalli by sufficient light, it is suggested that this alga maintains its population by an immediate colonization of juveniles throughout the year into gaps formed after older thalli are lost.

Journal

  • Aquaculture Science

    Aquaculture Science 50(1), 25-30, 2002-03-25

    Japanese Society for Aquaculture Science

References:  22

Codes

  • NII Article ID (NAID)
    10008020142
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03714217
  • NDL Article ID
    6115870
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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