北海道石狩湾新港周辺におけるマクロベントスの群集構造 Community Structure of the Macrobenthos around the Ishikari Bay New Port in Hokkaido, Japan

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Abstract

北海道石狩湾新港周辺においてマクロベントスの群集構造と底質粒度の性状を調べた。得られた結果は、以下の通りである。1)港内と河口周辺の底質は、淘汰の悪い細砂~極細砂で構成されていたが、港外の底質は、淘汰の良い中砂~極細砂で構成されるとともに、水深の増加に伴って粒径が細かくなる傾向が認められた。2)マクロベントス群集は、二枚貝類、多毛類、棘皮類および端脚類で構成された。3)マクロベントス群集の構造と分布パターンは、構成種の摂餌様式や浮遊幼生の発達様式に応じて地理的に異なっていた。4)本港周辺におけるマクロベントス群集は、構成種への食物供給を規定し、構成種の新規加入に影響を及ぼす流動条件によって特徴付けられていることが示唆された。

A macrobenthic survey was conducted around the Ishikari Bay New Port in west Hokkaido, Japan, to describethe community structure of macrobenthos associated with sedimentary conditions. A total of 70 species werecollected at 29 stations using a Smith-Mcintyre grab sampler in September 1998. Dominant species were threejuvenile bivalves (Mactra chinensis, Psendocardium sachalinensis, Megangulus uenulosos), six polychaetes(Goniada maculata, Spiophanes bombyx, Spio filicornis, Nephtys caeca, Magelona japonica, Glycera capitata),two echinodems (Scaphechinus griseus, Echinocardium cordatum), and four amphipods (Phoxocephalidae sp.,Ampelisca brevicornis, Urothoe grimaldii, Corophium sp.). Distribution pattems of the dominant species changedwith feeding type, depth and sediment particle size. Suspension feeders occurred at 2-17m depth in well-sortedmediate to fine sand. Deposit feeders occurred at 17-23m depth in well-sorted fine to very fine sand. Carnivoresoccurred at 7-17m depth in well-sorted mediate to fine sand and at the mouth of Ishikari River in unsorted fineto very fine sand. Tube-building deposit feeders occurred at the port in unsorted fine to very fine sand. Facultativedeposit feeders occurred throughout the whole survey area, except at the river mouth. At 2-17m depth,suspension-feeding bivalves, which have a planktonic larval period of 2-4 weeks, occurred densely on the northeastside of the port, and suspension-feeding amphipods which undergo direct development, were the dominantspecies on the southwest side of the port. It was suggested that macrobenthic communities around this port arestrongly affected by hydrodynamic conditions, which influence the food supply to the animals and their recruitment.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 37(2), 143-149, 2000-12-01

    The Japanese Society of Fisheries Engineering

References:  15

Codes

  • NII Article ID (NAID)
    10008273871
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    ENG
  • Article Type
    NOT
  • ISSN
    09167617
  • NDL Article ID
    5611932
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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