Temperate zones have undergone intense rainfall in recent years, which may induce alterations in the salinity of estuarine and coastal areas and consequently on benthic communities. Donax trunculus Linnaeus, 1758, is a component of the macrofauna in shallow areas of sandy beaches and, because of its economic value, one of the most exploited clams. The sensitivity of D. trunculus to salinity changes and differences related to size were tested in this study. Adults and juveniles of D. trunculus were exposed to different salinity treatments and mortality was registered every 12 h during 21 days. In general, salinities below 14.2 were lethal to both populations, whereas the survival rate was 100% in salinities equal to or above 26.7. Differences in survival rates between the two size classes were detected, especially at intermediate salinities, where juvenile survival was higher. Median lethal salinity (LC₅₀) was similar for both groups, although in juveniles the values were lower, whereas the median lethal time (LT₅₀) values were higher in young clams. Therefore, the results of this study suggest that D. trunculus is a euryhaline species whose tolerance to low salinities varies between size classes. Juveniles resist lower salinities than adults, and can withstand sudden changes in salinity over a longer period.

近年来，温带地区经历了强降雨，这可能引起河口和沿海地区盐度的变化，进而导致底栖生物群落的盐度变化。Donax trunculus Linnaeus，1758年，是沙滩浅水区大型动物的组成部分，并且由于其经济价值，也是最被开发的蛤one之一。在本研究中测试了麦冬对盐度变化和与大小有关的差异的敏感性。毛D的成年和少年接受不同的盐度处理，并在21天内每12小时记录一次死亡率。总体而言，盐度低于14.2对这两个种群均具有致命性，而盐度等于或高于26.7时，存活率为100％。检测到两种尺寸等级之间的存活率差异，特别是在中等盐度下，其中青少年存活率更高。两组的致死盐度中位数（LC ₅₀）相似，尽管在幼年时较低，而中龄致死时间中位数（LT ₅₀）较高。因此，这项研究的结果表明，D。trunculus是一种淡滨鱼种，其对低盐分的耐受性随大小等级而变化。幼虫的耐盐度比成年人低，并且可以在更长的时间内承受盐度的突然变化。