沙筛贝(Mytilopsis sallei)是我国南方一种重要入侵污损生物, 常见于附着在养殖设施上, 造成渔业损失。本研究采用生态学单因子梯度试验方法, 检测了沙筛贝幼体在系列梯度的盐度、水温、光照和溶解氧下的附着变态情况。结果发现, 沙筛贝幼体附着变态的适宜温度范围为25~35℃, 低温(10℃和15℃)明显抑制了附着变态, 而高温(40℃)导致幼体全部死亡; 沙筛贝幼体附着变态的适宜盐度范围为15‰~30‰, 最适盐度为15‰; 适宜光强范围为0 ~5000 lux, 超过10000 lux的光强则会显著降低沙筛贝幼体的附着率和变态率; 沙筛贝幼体在40%~100%饱和氧浓度(3.2~8.0 mg·L^-1)下均能正常附着变态, 但当溶解氧低于20 %饱和氧浓度(1.6 mg·L^-1)时, 会抑制其附着变态。研究表明，沙筛贝幼体适宜在较高温度（25℃-35℃）、较广盐度（15‰-30‰）和低光照（0-5000 lux）条件下附着变态，且其幼体具备较强的耐低氧能力。本研究揭示了沙筛贝幼体附着变态的适宜环境条件, 对预测其在我国沿海的可能分布扩散区域以及防止其进一步扩张至我国其他海域对当地水产养殖业造成危害具有重要意义。

The false mussel Mytilopsis sallei is an important invasive fouling organism in south of China, which is often attaching to aquaculture facilities and causes fishery losses. In this study, the ecological single factor gradient test was used to test larval settlement and metamorphosis of M. sallei under different salinities, water temperatures, light intensities and dissolved oxygen concentrations. The results showed that the suitable temperature for larval settlement and metamorphosis of M. sallei was 25~35℃. Low temperatures (10℃ and 15℃) inhibited larval settlement and metamorphosis, while high temperature (40℃) caused the death of all larvae. The suitable salinity was 15‰~30‰, with the optimal salinity of 15‰. The suitable light intensity was 0~5000 lux, but when light intensity reached more than 10000 lux, larval settlement and metamorphosis were significantly inhibited. The suitable dissolved oxygen concentration was 40%~100% of saturated oxygen concentration (3.2~8.0 mg·L^-1), but when the dissolved oxygen concentration is lower than 20% (1.6 mg·L^-1), larval settlement and metamorphosis were inhibited. M. sallei larvae was suitable to settle and metamorphose under high temperature (25~35℃), wide salinity (15‰~30‰) and low light intensity (0~5000 lux), with strong resistance capacity to low dissolved oxygen concentration. This study revealed the suitable environmental conditions on larval settlement and metamorphosis ofM. sallei, which is important for predicting its possible distribution in the coastal areas of China and preventing its invasion to other areas of China and causing aquaculture industry losses.