Salinity-induced phenotypic plasticity in threespine stickleback sperm activation
Salinity-induced phenotypic plasticity in threespine stickleback sperm activation
复制标题
盐度诱导的三刺刺鱼精子激活的表型可塑性
作者：
Annette Taugbøl;A. Mazzarella;E. Cramer;Terje Laskemoen
表型表达可能并且经常受到生物体发育环境的影响，称为表型可塑性。硬骨鱼类的精细胞在精浆中是不活跃的，大多数鱼类的精细胞在高渗（海水鱼）或低渗（淡水鱼）水中被渗透压休克激活。如果是这样的话，精子流动性的调节系统应该在咸水鱼和淡水鱼中逆转。我们测试了这一假设，首先激活精子的盐-和淡水种群的三刺鱼在盐-和淡水。精子从咸水刺鱼可以激活在任一盐度，这符合淡水殖民历史的物种，而从淡水人口的精子作为渗透压休克理论的预测，并在淡水激活。由于这里使用的淡水种群被计算为数千年的历史，我们继续测试这些特征是否具有可塑性，并且在个体暴露于盐水后，淡水雄性的精子仍然可以在盐水中被激活。在盐水中饲养淡水棘鱼后，我们发现成熟的雄性棘鱼在盐水和淡水中都有活跃的精子。此外，我们还发现野生淡水刺鱼的精子在将这些成熟雄性暴露于盐水仅2天后在盐水中活跃。这表明刺鱼精子在一系列水质中被激活的能力是一种环境诱导的可塑性特征。
Phenotypic expression may be and often is influenced by an organism's developmental environment, referred to as phenotypic plasticity. The sperm cells of teleosts have been found to be inactive in the seminal plasma and are activated by osmotic shock for most fish species, through release in either hypertonic (for marine fish) or hypotonic (for freshwater fish) water. If this is the case, the regulatory system of sperm mobility should be reversed in salt- and freshwater fish. We tested this hypothesis by first activating sperm of salt- and freshwater populations of threespine stickleback in salt- and freshwater. The sperm from saltwater stickleback could be activated in either salinity, which matches the freshwater colonization history of the species, whereas the sperm from the freshwater population acted as predicted by the osmotic shock theory and was activated in freshwater only. As the freshwater population used here was calculated to be thousands of years old, we went on to test whether the trait(s) were plastic and sperm from freshwater males still could be activated in saltwater after individuals were exposed to saltwater. After raising freshwater stickleback in saltwater, we found the mature males to have active sperm in both saltwater and freshwater. Further, we also found the sperm of wild-caught freshwater stickleback to be active in saltwater after exposing those mature males to saltwater for only 2 days. This illustrates that the ability for stickleback sperm to be activated in a range of water qualities is an environmentally induced plastic trait.
影响因子：
2.8
作者：
Yang H;Tiersch TR
通讯作者：
Tiersch TR