Biodiversity Science ›› 2000, Vol. 08 ›› Issue (1): 65-72.doi: 10.17520/biods.2000009

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Variations in community structure of fishery resources and biodiversity in the Laizhou Bay, Shandong

JINXian-Shi, DENG Jing-Yao   

  1. Yellow Sea Fisheries Research Institute , Chinese Academy of Fishery Sciences , Qingdao 266071
  • Received:1999-04-14 Revised:1999-08-05 Online:2000-02-20

Based on seasonal bottom trawl surveys from 1959 to 1999 , the variations in fishery resources , dominant species composition and community structure were analyzed. The results indicate that the biomass has continuously declined from 1959. The current biomass account for only 3. 3 % , 7. 3 % and 11. 0 % of that in 1959 , 1982 and 1992~1993 , respectively. Although dominant species vary in different seasons , the traditional large- sized demersal species , such as largehead hairtail ( Trichiurus haumela) and small yellow croaker ( Pseudosciaena polyactis) , have been replaced by small pelagic species , such as anchovy ( Engraulis japonicus) , half-financhovy ( Setipinna taty ) , gizzard- shad ( Clupanodon punctatus ) , and rednose anchovy ( Thrissa kammalensis) . The community structure has also changed , while species diversity increased from 1959 to 1982 and then decreased continuously. The disturbance , particularly fishing , may increase the diversity at intermediate intensity , but too high fishing intensity may lead to diversity decrease. At present , the community structure is simple at un-equilibrium state in the Laizhou Bay , the community succession will continue , and the biomass of small pelagic species with high resilience may recover and increase if the disturbance is significantly reduced.

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