植生の異なる実験藻場における生物群集の決定要因  [in Japanese] Determine Factors of Community Organization in Some Artifitial Sargassum Beds with Different Vegetation  [in Japanese]

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Abstract

天然のガラモ場と人工基質上に実験的に発生させた様々な植生の藻場間で生物群集を比較し、その決定要因をなり得る藻場内の環境条件を分析した。天然岩礁上のガラモ場、人工藻場の一定面積に攪乱を与えた混生区、オオバノコギリモクのみを残した単一区、基質上の生物を全て除去した裸地区の各藻場で、以下の点が明らかになった。1)人工基質上の藻場に攪乱を加えることにより、様々な植生の藻場を生じさせることが可能になり、このような藻場が、大型海草が藻場の生物群集に与える影響の調査とその実証研究に有効であることが分かった。2)葉上動物では節足動物のヨコエビ・ワレカラ類が、基質上では二枚貝類が圧倒的多数をしめた。3)葉上動物の現存量が大型海草のサイズや密度、種多様性によって異なっていることから、棲み場所としての構造や食物となる小型海藻の量が重要な決定要因であると考えられた。4)基質上の動物の個体数は、着底に適した裸面の面積によって決まる可能性が高い。5)人工的な藻場を利用することで様々な遷移段階の藻場を比較でき、藻場の生物群集の遷移をより詳しく調査できる。

Animal and plant communities in Sargassum beds were compared among some areas with different vegetationto analyze environmental conditions, which may determine compositions of communities. Study areas were naturalSargassttm vegetation area and some artificial Sargassttm beds on the concrete blocks ; poly-species area whichwas disturbed partly, S. giganteifolinm area on which all macrophytes except for S. giganteifolium were removedand barren area on which all organisms were removed. These areas were useful to study the influences ofmacrophyte on community structure in Sargassum beds. In the phytal animal communities, arthropoda especiallygammaridea and caprellidea were dominant, and bivalves in animal communities on the bottoms. Biomass of phytalanimals seemed to be related to size, density and species diversity of macrophyte. Then it was thought that habitatcomplexity and biomass of microphyte as food were very important for phytal animals. On the bottoms, animaldensities were probably determined by the area of bared bottom suited for settlement. We could further compareamong some Sargassum beds in different phases of succession. It enables to study community succession inSargassum beds.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 36(1), 1-10, 1999-07-15

    The Japanese Society of Fisheries Engineering

References:  23

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008275125
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09167617
  • NDL Article ID
    4818630
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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