厦门港桡足类卵库对其浮游种群潜在补充量的初步研究

Preliminary Study on the Potential Recruitment of the Copepods Egg Bank into the Planktonic Population in Xiamen Harbor

对厦门港沉积物中桡足类卵库对其浮游种群潜在补充量进行了初步研究.结果表明,厦门港桡足类卵库对其浮游种群潜在补充量呈不均匀分布,变化范围为5.3×103～9.7×104个无节幼体/m2,平均值为3.5×104个/m2.其水平分布呈明显的"一高两低"格局,即内港区高于外港区,中心区高于沿岸区.其垂直分布格局为:0～1cm层的潜在补充量最高,达到6.5×103个/m2;另一高峰区出现在4～7cm层,平均为5.4×103个/m2;其余各层较低,平均为2.3×103个/m2,并将桡足类卵库垂直分布划分为功能不同的4层:最表层(0～1cm层),次表层(1～5cm层),中层(5～8cm层),下层(8～10cm层及其下部各层).最后对形成这种分布格局的可能原因及沉积物中桡足类卵库对其浮游种群潜在补充作用进行了讨论.

The potential recruitment of copepods egg bank into the planktonic population in Xiamen Harbor was investigated in November, 2002. The horizontal distribution of the potential recruitment is not even, ranging from 5.3×10~3 to 9.7×10~4 naupllii·m^(-2) with the mean value of 3.5×10~4m^(-2). The character of the horizontal distribution is that the potential recruitment of the inside harbor is higher than that of the outside and the potential recruitment of the central area is higher than that of the nearshore area. In the vertical distribution the potential recruitment of the 0～1 cm layer is the highest, which is about 6.5×10~3m^(-2). The second peak occurs in the 4～7 cm layers and the values of the other layers are low. According to the different function the vertical distribution is divided into four different layers: 1 cm layer, 2～5 cm layer, 5～8 cm layer,<8 cm layer. Finally the possible reasons of the distribution pattern are discussed.