虾池小型底栖动物类群组成和数量分布

Composition and Quantity Distribution of Meiofauna in Shrimp Ponds

2002-09-10—2003-02-26期间6次采样,对厦门高崎3口虾池小型底栖动物的数量变动、生物量变化及水平分布进行了初步研究,结果表明:自由生活海洋线虫和桡足类是虾池中小型底栖动物的主要类群.实验期间养殖区和对照区中,线虫的平均密度基本相同,分别为(59.0±26.1)(个.cm-2)和(51.1±31.8)(个.cm-2);桡足类的平均密度分别为(6.0±6.2)(个.cm-2)和(1.5±1.0)(个.cm-2).整个实验期间2个类群的数量,养殖区表现为养殖前期(大约2个月内)激增,之后在一定的范围内上下波动;对照区表现为比养殖前期更长的期间内增长,特别是桡足类,在整个养殖期间近乎呈现为逐步增长的趋势.养殖区和对照区中,线虫的生物量干重分别为(9.43±4.18)(μg.cm-2)和(8.17±5.09)(μg.cm-2);桡足类的分别为(11.93±12.36)(μg.cm-2)和(2.93±2.07)(μg.cm-2).两大类群的水平分布规律不同.

From September 21st, 2002 to February 26th, 2003, the abundance and horizontal distribution of meiofauna had been investigated in the shrimp ponds. The results showed that the free-living marine nematodes and copepods were the dominant group. During cultural period, average abundance of nematodes were 59.0 ±26. 1 （ ind./cm^-2 ） 和 51.1 ± 31.8 （ ind./cm^-2 ） respectively in experimental zone and control zone, copepods, 6. 0 ±6. 2 （ ind./cm^-2 ） and 1.5 ±1.0 （ ind./cm^-2 ） respectively in experimental zone and control zone. During cultural period, the abundance of the free-living marine nematodes and copepods in the experimental zone increased sharply during the first two months of culture, then fluctuated at a scale of the lower quantity. And in control zone, the abundance of the free-living marine nematodes and copepods increased for a longer time than if in experimental zone. Especially, the abundance of copepods increased during the whole culture period. The biomass of nematodes were 9.43±4. 18 （ μg·cm^-2） 和 8. 17 ±5. 09 （ μg·cm^-2 ） respectively in experimental zone and control zone, copepods, 11.93 ± 12. 36 （ μg·cm^-2 ） and 2.93 ± 2. 07 （ μg·cm^-2） respectively in experimental zone and control zone. On the horizontal distribution, the freeliving marine nematodes and the copepods were not uniformly distributed.