Biodiversity Science ›› 2011, Vol. 19 ›› Issue (4): 470-475.doi: 10.3724/SP.J.1003.2011.06260

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The distribution and habitat use of Branchiostoma belcheri at the mouth of Jiaozhou Bay, Qingdao in Autumn

Wei Yuan, Jun Wang*, Qun Lin, Chenghua Wang, Jianqiang Sun   

  1. Laboratory of Stock Assessment and Ecosystem, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071
  • Received:2010-10-28 Revised:2010-12-21 Online:2011-07-29
  • Jun Wang E-mail:wangjun@ysfri.ac.cn

Branchiostoma belcheri is a second class protected animal species in China, and is distributed mainly in Jiaozhou Bay and adjacent areas. Based on an ecological survey in November, 2009, the distribu-tion of the lancelet and its relationship with bottom sediments were studied. We found that Beisha waters may be the predominant habitat of lancelet in autumn. Most individuals within three year classes fit in a body size range of 30–40 mm. The abundance and biomass of lancelets in Beisha were 162 ind./m2 and 11.93 g/m2, respectively. No obvious length classes were observed in Nansha waters. The abundance and biomass of lancelets were 17.33 ind./m2 and 0.57 g/m2 in Nansha, respectively. We found that the sediment type in Bei-sha waters was gravel and sand while it was sand and silty sand in Nansha waters. Lancelets generally were found in areas with sandy sediment where the range of mean grain-size was very large with a water depth of 10–20 m. To cope with declining lancelet populations, an adequate reserve should be established in Beisha waters.

Key words: biodiversity, fungi, conservation of fungi

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