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外来物种沙筛贝(Mytilopsis sallei)是一种滤食性软体动物双壳类,它有着很快的生长速度和很强的摄食能力.为了探索沙筛贝在不同盐度下对微藻的摄食能力,采用颗粒计数仪,测定了沙筛贝在15、20、25、30、35等5个盐度梯度下对等鞭金藻(Isochrysis galbana)和小球藻(Chlorella vulgaris)的摄食率,比较了不同沙筛贝个体大小对小球藻的摄食率.结果表明,沙筛贝对等边金藻和小球藻的摄食率均在盐度25时达到最大,分别为3.42×104cells/(ind.h)和6.72×104cells/(ind.h).沙筛贝对等边金藻的摄食率随时间推移而降低,一是因为沙筛贝摄食率随着藻类密度的降低而减小,二是当海水盐度下降,沙筛贝渗透压改变,导致了进入其外套腔的海水体积的减少,从而摄食率也减少.个体较大(壳长2.8～3.5 cm)的沙筛贝对小球藻的摄食率明显高于个体较小(壳长1.7～2.4 cm)的沙筛贝的摄食率,这与其他贝类的研究结果是一致的.
Alien Species Mytilopsis sallei is a bivalve, which is a filter-feeding mollusk with rapid growth rate and high feeding capacity.In order to explore the ability of sand sieve to feed on microalgae at different salinities The feed intake rates of Isochrysis galbana and Chlorella vulgaris were determined by using particle counting instrument under 5 salinity gradients of 15, 20, 25, 30, 35 and so on. The feeding rates of Chlamydomonas reinhardtii to chlorella vulgaris at different size of sand sieve were studied.The results showed that the feeding rates of Chlamydomonas reinhardtii and chlorella reached the maximum at salinity 25, 3.42 × 104cells / (ind .h) and 6.72 × 104cells / (ind.h), respectively. The feeding rates of C. albiflorus decreased with the lapse of time. The first reason was that the feeding rate of S. sievicis decreased with the decrease of algae density. When the salinity of the sea drops, the osmotic pressure of the sand sieve changes, resulting in a decrease of the volume of the seawater entering the outer jacket, thereby reducing the feeding rate. Larger individuals (2.8-3.5 cm in shell length) The ingestion rate of algae was significantly higher than that of the smaller (shell length 1.7-2.4 cm) sand sieve, which was similar to that of other shellfish The result is the same.