| Based on the data of shrimp resources sampled in the inshore waters in the southern HaizhouBay (34.60°～35.00°N，119.40°～119.90°E) in May(spring), September(summer) andDecember(winter),2009, as well as the date of shrimps in the inshore waters in Putian, the middleof Fujian Province, the southern of the East China Sea, the shrimp species composition, dominantspecies, ecological group, diversity, seasonal variety of the community were analyzed.The major results showed that:(1)The abudance of Decapoda shrimps in the south Haizhou Bay wereMay>December>September. Major dominant species in May, September and December wereMetapenaeopsis dalei and Alpheus japonicas, Parapenaeopsis tenella and Metapenaeus ensis,Alpheus japonicas, respectively. There was a strong resemblance in spatial distributions betweenMay and September, which were lower in northwest outside and southeast waters, evenlydistributed in south coastal waters, and with highest abundances in east and middle waters. Whilein December, the shrimp abundance was lower in north and south coastal waters, highest in eastwaters, and was evenly in other waters. According to stepwise regression analysis on shrimpabundance and hydrological factors, the shrimp abundance in this paper has significant correlationwith bottom salinity, insignificant correlations with other factors. Besides, eco-habits of dominantspecies, red tide, runoff, etc, affected the spatial and temporal variations in the abundance ofDecapoda shrimps in Haizhou Bay to a certain extent.(2)The shrimp community in the southern Haizhou Bay possessed typical inshorewarm-temperate characteristics as part of the Southern Yellow Sea. With Alpheus japonicas,Palaemon gravieri, Metapenaeopsis dalei as major dominant species, the shrimp community inspring and winter had got remarkable warm-temperate characteristics, while in summer itswarm-water characteristic was increased with Metapenaeus ensis, Parapenaeopsis tenella andTrachypenaeus curvirostris as dominant species.19species of shrimps were identified in thesurvey, with18,9and9species in winter, spring and summer, respectively. In winter, the diversityindex (H′) of biomass for shrimps was the highest, and its k-dominant curve went more smoothly,while the indexes were lower in spring and summer, which suggested the community structure inwinter was more steady. With the CLUSTER and nMDS analysis, there were three mainassemblages for the shrimp community in winter, which were inshore assemblage, Guan Estuaryassemblage and eastern outside assemblage. This division was relatively stable as the assemblages were in great conformity with the environment background.(3)The comparision between the shrimps of the south Haizhou Bay and the inshore waters inPutian, where are located in the warm temperate zone and subtropical zone respectively, suggestedthat there were some similarity and difference for certain extent. The common shrimp species inboth waters showed the similarity, most of which are species widely distributed in China sea, aswell as some warm-water species which could enter into the Yellow Sea. The relatively endemicspecies for the two waters showed typically warm-temperate and subtropical characteristicsrespectively, for example, the cold-temperate species Crangon affinis is abundant in winter in thesouth Haizhou Bay, while the warm-water species from the South China Sea such as Parapenaeusfissuroides and Exhippolysmata ensirostris appeared in Putian. As far as the seasonal variationwas concerned, the diversity in winter in the south Haizhou was the highest, while spring in Putian,which might be influenced by the west tributary of the Yellow Sea Warm Current in winter andthe Zhemin Coastal Current in spring respectively. Besides, the dominant and major species forshrimps in the south Haizhou Bay were apparently warm temperate and subtropical in Putian, withlarger size and weight for the latter one. |
PDF Full Text Request