Distribution of viriobenthos in surface sediment in Dalian and Dayao Bay
LI Qing1,2, YAN Qi-lun2, LI Hong-bo2, WU Li-xin1, FENG Jin-xiang3, ZHANG Yu-hong4
1. College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China;
2. Key Laboratory for Ecological Environmental in Coastal Area(SOA), National Marine Environmental Monitoring Center, Dalian 116023, China;
3. Dalian Fishery School, Dalian 116023, China;
4. School of Environment and Safety Engineering, Shenyang University of Chemical technology, Shenyang 110141, China
Abstract：To study the relationship between virus and bacteria in surface sediment, we conducted 3 cruises in May(spring), August(summer) and November(autumn) of 2012 in Dalian bay and Dayao bay.The abundance of viruses and bacteria were measured used the SYBR Green I method by epifluorescence microscopy.In Dalian bay, the results showed:the abundance of viruses in surface sediment varied in three seasons, and average abundance was summer >spring >autumn.The maximum value 1.59×108VLP/g(wet weight) occurred in summer, and the minimum value 1.53×106VLP/g occurred in spring.The viriobenthos horizontal distribution showed bay middle >bay top >bay mouth in spring, however bay middle >bay mouth >bay top in summer and autumn.The relationship between virus and bacteria was distinct(R2=0.80, n=20).In Dayao bay, the viriobenthos abundance of seasonal variations was summer >autumn >spring, and the maximum value was 7.08×107VLP/g, the minimum value was 1.16×106VLP/g.Dayao bay includes two groups, inner and outer.The abundance of viriobenthos was showed more in outer than in inner.The relevance between bacteria and viruses was not very well(R2=0.50, n=12).The ratio of viruses to bacteria in sediment was 4.12 and 4.09, respectively, which was similar in Dalian and Dayao Bay.The distribution difference might be in relation to environmental factors in two bays.
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