胶州湾内纺锤水蚤休眠卵的研究

RESTING EGGS OF ACARTIA BIFILOSA GIESBRECHT AND A.PACIFICA STEUER IN JIAOZHOU BAY

描述了胶州湾内双刺纺锤水蚤(Acrlia bifilasa)和太平洋纺锤水蚤(A.pacifica)卵的形态,揭示了底泥中休眠卵数量季节变动与种群数量变动的关系,并探讨了温度、盐度、泥覆盖等环境因子对休眠卵孵化率的影响。

The seasonal changes of abundance of populations of Acartia bificlosa and A. pacifica in the water column and of their eggs recovered from the bottom sediment in Jiaozhou Bay are described. The density of eggs in the sea bottom was the highest shortly before the disappearance of copepods from the plankton; the numbers of eggs then gradually decreased until the appearance of the next planktonic population. Resting eggs obtained from sea-bottom sediment were hatched at different temperature and salinity conditions in the laboratory. A wide range of salinity, from 5 to 50 for A. bifilosa and from 5 to 65 for A. pacifica was favourable for hatching. Eggs failed to hatch within the sediment mud. Temperature seems to be the main factor that influencing the production and hatching of- resting eggs.