[Secondary productivity of macrobenthos in Jiaozhou Bay]

From September 2003 to September 2004, seven cruises bimonthly survey was conducted on the macrobenthos at five research stations in the Jiaozhou Bay, and the abundance, biomass, secondary productivity, and P/B value of the macrobenthos were studied by using Brey' s empirical formula. The results showed that the secondary productivity of the macrobenthos was averagely 47.34 g x m(-2) x a(-1), and the mean P/B value was 0.58. Correlation analysis indicated that Chl-a was the important environmental factor affecting the secondary productivity. A comparative study on the southern Yellow Sea, Bohai Bay and other areas also proved that on local scale, Chl-a was the important factor affecting the secondary productivity of the benthic community, but on regional scale, water depth was more determinative, i.e., this productivity was decreased with increasing water depth. The greatest contributor to the secondary productivity of macrobenthos in studied areas was Ruditapes philippinarum, the most important economic bivalve in the Jiaozhou Bay, and its population was dominated by the individuals with the ages of less than one year, one year, and two years.