| To investigate the role of planktonic copepods in the biogeochemical cycling of carbon turnover in theBohai Sea and the northern Yellow Sea. Zooplankton species composition and abundance were studied, so was the dominant species were analyzed in particular the main copepods with composition, quantity and spatial distributionin July 2013(summer). Feeding activities, environmental factors and food concentration of planktonic effect on copepods was reserch by Gut fluorescence method to compared with the composition, quantity, grazing rate of planktonic copepods in differences and reasons, to study the diffenerces in sea plankton ecosystem dynamics of global with changing. As the same as, the works can be filled the gaps in the northern Yellow sea planktonic copepods feeding, contributing to establish the model of the north Yellow Seaea marine ecosystem dynamic fishery resources and other changes provided references.Zooplankton species mainly were planktonic copepods in July Bohai Sea and Yellow Sea north, which it accounted for more than 90% in the total of zooplankton. Bohai Sea planktonic copepod species number and quantity are higher than the northern Yellow Sea. Dominant species of zooplankton with the big net-like in Bohaiwere Paracalanus parvus,Calanus sinicus, Acartia hongi and Centropages abdominalis, and the middle net-like were Oithona similis, Acartia hongis,Centropages abdominalisand Calanus sinicus; Dominant species of zooplankton with the big net-like in northern Yellow Sea were Calanus sinicus, Centropages abdominalis, Sagitta crassa and Calanus sinicus, and the middle net-like were Oithona similis, Acartia hongi, Paracalanus parvus, Calanus sinicus, Centropages abdominalis andcopepod nauplius. The dominant species of two common area includes Calanus sinicus, Centropages abdominalis, Paracalanus parvus, Acartia hongi and Oithona similis. A total of 14 planktonic copepods were identified, and the total number of copepods was 846630.01 ind./m3 in bohai sea, which is accounted for 93.95% with the total number of Zooplankton. A total of 7planktonic copepods were identified, and the total number of copepods was 276115.75 ind./m3 in Yellow Sea, which is accounted for 93.02% with the total number of Zooplankton.(2) Bohai Sea and Yellow Sea north of planktonic copepods group feeding rate is insignificant, but the same type of a single ind.ividual feeding rate was significantly lower than the northern Bohai Sea Yellow Sea; Small and medium-sized copepods feeding group was higher than Largecopepods.Calanus sinicus,Acartia hongi and Paracalanus parvus in the bohai sea obviously was lower than the north Yellow Sea, such as the intestinal pigment content with Calanus sinicus were 1.12 ng/ind and 1.84 ng/ind and the intestinal pigment content with Acartia hongi were 0.06 ng/ing and 0.29 ng/ind in the Bohai Sea and the north Yellow Sea, respectively. The intestinal pigment content of Large copepods was higher than small copepods individuals because the individual is larger. Large and small and medium-sized copepods individual existted the phenomenon of day and night feeding rhythm. The intestinal pigment content of Calanus sinicus ranged from 0.12 to 1.25 ng/ind and it was average 0.59 ng/ind. The intestinal pigment content of Acartia hongi ranged from 0.02 to 0.10 ng/ind and it was average 0.06 ng/ind. The intestinal pigment content of Paracalanus parvus ranged from 0.02 to 0.14 ng/ind and it was average 0.59 ng/ind. The intestinal pigment content of Acartia bifilosaranged from 0.02 to 0.1 ng/ind and it was average 0.06 ng/ind. The group feeding rate of planktonic copepods were 8,777.93 μg/m2/d and 8,772.56 μg/m2/d in the Bohai Sea and Yellow Sea north, respectively. The Small and medium-sized group of copepods accounts for 86.65% and 60.79% of copepods feeding rate of the total population rates in the Bohai Sea and Yellow Sea north, respectively. The rate of small and medium-sized copepods group feeding in bohai sea was higher than the north Yellow Sea。... |
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