Effects of salinity on filtration, ingestion, and assimilation rates of three filter-feeding bivalves in the Yangtze River estuary
Theeffects of salinity on the filtration, ingestion, and assimilation rates of three filter-feeding bivalves in the Yangtze River estuary were evaluated using indoor experimental ecological methods. Groups ofSinonovacula constricta andPotamocorbula laeviswere each set up in six salinity grids (5, 10, 15, 20, 25, and 30), and Corbicula flumineawas set up in different six salinity grids (0, 5, 10, 15, 20, and 25). The biological parameters of these bi-valves were measured. The results showed that their filtration, ingestion, and assimilation rates increased with in-creasing salinity, reaching peak levels when the salinity increased to a certain point, then dropped following in-creasing salinity. The filtration, ingestion, and assimilation rates ofS. constrictareached peak levels at a salinity of 20, giving values of 0.57 L/h, 5.38 mg/h, and 0.72%, respectively. The filtration and assimilation rates ofP. laevis reached peak levels at a salinity of 10, giving values of 0.46L/h and 0.53%, respectively, and the ingestion rate reached a peak level of 3.80 mg/h at a salinity of 15. The filtration and ingestion rates ofC. fluminea reached peak levels at a salinity of 15, giving values of 0.39 L/h and 2.48 mg/h, respectively, and the assimilation rate reached a peak level of 0.51% at a salinity of 0 and dropped following increasing salinity. The above results indicate that sa-linity has a large impact on the three feeding physiology indexes of the three filter-feeding bivalves.
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