Journal of Tropical Oceanography >
Dynamics of heterotrophic bacteria and vibrios in mariculture area of Shen’ao Bay, east Guangdong Province
Received date: 2009-03-25
Revised date: 2009-06-15
Online published: 2010-12-15
Supported by
广东省科技计划重点项目(2006A36502001, 2007A032600003)
The spatio-temporal dynamics of heterotrophic bacteria (HB) and Vibrios bacteria in the Shen’ao Bay were studied based on a two-year sampling from Jan. 2007 to Dec. 2008. The results showed that the abundances of HB and Vibiros bacteria in the water body ranged from 1.20×105 to 1.27×108 and 1.00×103 to 3.90×105cfu•L?1, respectively, while those in the sedi-ment only ranged from 2.73×104 to 4.06×107 and 3.25×102 to 7.23×104cfu•g?1, respectively. Stronger fluctuations were also found in the abundances of HB and Vibiros bacteria from water body than those from sediment, possibly in responses to highly changing environmental factors of water body, especially nutrients. In fact, significant correlations were recorded between the abundances of HB and Vibiros bacteria and nutrients (N and P). At the same time, the distribution patterns of HB or Vibiros in this study varied with different aquaculture activity. In the seaweed (Gracilaria sp.) culture area (S3), the abundance of HB in the water body was much higher than that in the sediment. However, in the cage-culture area (S5), higher abundances of HB and Vibiros bacteria were found in the sediment. These results may suggest that seaweed culture (e.g. Gracilaria sp.) can im-prove the sediment quality, especially those factors that can cause detrimental effects on aquaculture animals and water quality including abiotic and biotic ones, such as sulfide and Vibrios bacteria.
Key words： Shen’ao Bay; Heterotrophic bacteria; Vibrios bacteria; spatiotemporal patterns; PCA
DU Hong,HUANG Xian-bing,ZHENG Bing,CHENG Wei-zhou,ZHUANG Dong-hong,HU Zhong . Dynamics of heterotrophic bacteria and vibrios in mariculture area of Shen’ao Bay, east Guangdong Province[J]. Journal of Tropical Oceanography, 2010 , 29(6) : 110 -117 . DOI: 10.11978/j.issn.1009-5470.2010.06.110
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