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

doi:10.3724/SP.J.1003.2011.06260

Abstract

Abstract:

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 distribution 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 Beisha 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.

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Key words: Branchiostoma belcheri, distribution, sediment, protection zone

Wei Yuan, Jun Wang, Qun Lin, Chenghua Wang, Jianqiang Sun. The distribution and habitat use of Branchiostoma belcheri at the mouth of Jiaozhou Bay, Qingdao in Autumn[J]. Biodiv Sci, 2011, 19(4): 470-475.

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URL: https://www.biodiversity-science.net/EN/10.3724/SP.J.1003.2011.06260

https://www.biodiversity-science.net/EN/Y2011/V19/I4/470

Figures/Tables 4

Fig. 1 Investigation area and stations of Branchiostoma belcheri at the mouth of Jiaozhou Bay

Fig. 2 Body length distribution of Branchiostoma belcheri in Beisha (a) and Nansha waters (b)

Fig. 3 Percentage contents of four particles in Beisha and Nansha waters

Table 1 Comparison of density and biomass in Beisha and Nansha waters with other results

调查海域 Study area	栖息密度 Density (ind./m²)	生物量 Biomass(g/m²)	调查时间 Survey year	参考文献 Reference
北沙海域 Beisha waters	753	77.37	1981	李新正等(2007)
	1,220	53.27	2004	李新正等(2007)
	162	11.93	2009	本文
南沙海域 Nansha waters	44	5.51	2008	杨建威等(2008)
	17.33	0.57	2009	本文
	2-27	/	2003	马绍赛等(2003)

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