The proportion of Mollusca and Insecta larva take up in the total composition of species obviously increased from 9.%,.89% to 0.00% and .00%,respectively;
The proportion of Mollusca and Insecta larva take up in the total composition of species obviously increased from 9.%,.89% to 0.00% and .00%,respectively;
而软体动物和昆虫幼虫种类所占比例则明显增加 ,分别从占总种数的 9. %、 .89%增加到 0 .0 0 %和 .0 0 % ;