Diversity Pattern and Environmental Response of Meiofauna in China Seas with Special Reference to the Yellow Sea Cold Water Mass
|School||Graduate School , Chinese Academy of Sciences ( Institute of Oceanography )|
|Keywords||Yellow Sea East China Sea South China Sea Meiofauna Abundance Biomass Heavy metal pollutants|
In the summer of 2007, a total of 48 stations on the cold water masses in the Yellow Sea and adjacent waters meiofauna composition, abundance and biomass, as well as environmental factors in the expedition. The surveyed stations meiofauna average abundance of 2194 ± 1598 inds./10cm ~ 2, which average abundance of the 17 stations in the northern Yellow Sea 3408 ± 1578inds./10cm ~ 2, 31 stations average in the southern Yellow Sea The abundance of 1529 ± 1121 inds./10cm ~ 2. The survey station average biomass of 1839 ± 1289μg dwt/10cm ~ 2, North Yellow Sea stations average biomass of 2760 ± 1340μg dwt/10cm ~ 2, the average biomass in the southern Yellow Sea 1335 ± of 902μg dwt/10cm to 2. Dominant sub-elected a total of 18 small benthic fauna, are free-living nematodes abundance reached 88% of the total, and in the South (88.3%), North Yellow Sea (87.7%) Basic differences. Biomass, the same free-living nematodes contributed most (42%), the polychaetes second place (22%), the other biomass more copepods (13%) and crustacean larvae (12%). 0-2cm meiofauna accounted for 79% on the vertical distribution of meiofauna distribution in surface sediments, subsurface 2-5cm accounted for 17% of the bottom 5-8cm only 4%. Statistical analysis showed that small research stations benthic animal abundance and biomass of sediment chlorophyll a, organic matter content, median particle size were significant or very significant positive correlation was very significantly negatively correlated with water depth, addition meiofauna biomass significantly negatively correlated with the sediment silt clay content. Equipped in the fall of the same year to open the voyage five stations on the Yellow Sea, the three stations in the East China Sea, South China Sea, the two stations meiofauna composition, abundance and biomass, as well as environmental factors was investigated. A comparative study of the three waters meiofauna found that the average abundance of the Yellow Sea, the highest, reaching 2132 ± 946 inds./10cm ~ 2, East China Sea, followed for from ± 2047 inds./10cm 1954 to 2, and the South China Sea, only 156 ± 56 inds./10cm ~ 2; the three waters average biomass order of 2193 ± 1148μg dwt/10cm ~ 2,1865 ± 1555μg dwt/10cm ~ 2 and 212 ± 22 μg dwt/10cm. Dominant sub-elected a total of 14 small benthic fauna, are free-living nematodes abundance, respectively, accounted for 85% of the total, 89%, 85%. Biomass, the Yellow Sea to the free-living nematodes contributed most (33%), the polychaetes in second place (18 percent); similar ratio between the two in the East China Sea (about 37%), and the South China Sea by polychaetes dominant (56%) , nematodes in second place (25%). On the vertical distribution of meiofauna, three sea is quite different: distributed in the sediment surface 0-2cm meiofauna up to 90% in the Yellow Sea, the East China Sea is only 46%, and 63% in the South China Sea. Statistical analysis showed that, of meiofauna abundance of this study stations with sediment chlorophyll a and pheophytin a content and temperature at the end was a significant positive correlation was significantly negatively correlated with water depth. In contrast to the results carried out the voyage in the South China Sea in the east of Guangdong Zhanjiang and Hainan 908 findings formed meiofauna and nematodes abundance of the latter with sediment organic matter content was a significant positive correlation with water depth showed a significant negative correlation, indicating that the offshore human disturbance greater impact. In this paper, micro universe experimental method to determine the different concentrations of Cu, Pb, and Cu / Pb mixed heavy metal contaminants Qingdao Bay meiofauna (mainly nematodes). 1,3,7,14,21 days, respectively, after adding pollutants to the sampling and analysis. The results show that the nematode abundance, Cu and Cu / Pb-mixing high-concentration experimental unit group except in the first 21 days, more significantly reduced, substantially no change in the entire experimental period, analysis of possible lines fixed effect of the high concentration of Cu so that small benthic animals can not rot degradation caused. On the same time scale, the heavy metal pollutants experimental unit nematode abundance were higher than (or close to) a blank control group, a higher concentration of heavy metal pollutants experimental unit nematode abundance higher than (or close to) a lower concentration heavy metal pollutants experimental unit, Cu / Pb mixed low concentrations of the experimental unit nematode abundance of low-concentration experimental unit higher than the same time scale as the low concentration of Cu and Pb. Presumably due to the sampling points nematode community tolerance of Cu and Pb species or opportunities species caused.