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Elevated temperature, but not acidification, reduces fertilization success in the small giant clam, Tridacna maxima

机译：升高温度但不酸化会降低小蛤c Tridacna maxima的施肥成功率

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Elevated temperature and decreased ocean pH (ocean acidification) are associated with anthropogenic climate change and can adversely affect fertilization and development in marine invertebrates. However, the potential synergistic impact of these stressors on fertilization success remains unresolved for many ecologically and economically important species including giant clams of the genus Tridacna. Individual and interactive effects of warming and acidification on fertilization (successful first cleavage) were investigated in the small giant clam, Tridacna maxima. Experiments were performed on gametes of T. maxima (collected in October 2015 from the island of Moorea, French Polynesia; 17.54 degrees S, 149.83 degrees W) fertilized under ambient conditions (27 degrees C, pH 8.1) and under conditions congruent with temperature and pH projections for the coming century (31 degrees C, pH 7.6). Fertilization success was low, but within previously reported levels, under ambient conditions (47.7 +/- 3.4%) and was significantly reduced at elevated temperature per se and in combination with lowered pH (18.5 +/- 4.4% and 21.2 +/- 4.6%, respectively). However, acidification alone had no effect on fertilization success in T. maxima (48.2 +/- 3.1%). These results indicate that although fertilization in T. maxima is resilient to lowered pH, it is strongly inhibited by elevated temperature. Populations of T. maxima may, therefore, be at risk of low reproductive success over the coming century as a result of rising ocean temperature.
机译：温度升高和海洋pH值降低（海洋酸化）与人为气候变化有关，可能会对无脊椎动物的受精和发育产生不利影响。但是，对于许多生态和经济上重要的物种，包括Tridacna属的巨型蛤c，这些胁迫源对施肥成功的潜在协同影响仍未解决。在小巨蛤Tridacna maxima中研究了变暖和酸化对施肥（成功的第一次卵裂）的个体和相互作用的影响。实验是在环境温度（27摄氏度，pH 8.1）和与温度和温度相适应的条件下施肥的最大T.配子（2015年10月从法属波利尼西亚的Moorea岛收集的; 17.54度，149.83度）。未来一个世纪的pH值预测（31摄氏度，pH 7.6）。施肥成功率很低，但是在先前报道的水平下（在环境条件下为47.7 +/- 3.4％），并且在温度升高时本身以及在pH值降低的情况下（18.5 +/- 4.4％和21.2 +/- 4.6）明显降低％， 分别）。然而，仅酸化对最大值T.（48.2 +/- 3.1％）的施肥成功没有影响。这些结果表明，尽管最大T.的施肥对降低的pH具有弹性，但温度的升高强烈地抑制了施肥。因此，由于海洋温度上升，在未来的一个世纪中，巨大锥虫的种群可能面临繁殖成功率低的风险。

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  • 来源
    《Marine biology》 |2020年第1期|8.1-8.10|共10页
  • 作者

    Armstrong Eric J.; Dubousquet Vaimiti; Mills Suzanne C.; Stillman Jonathon H.;

  • 作者单位

    Univ Calif Berkeley Dept Integrat Biol 3040 Valley Life Sci Bldg 3140 Berkeley CA 94720 USA|San Francisco State Univ Dept Biol Estuary & Ocean Sci Ctr Tiburon CA 94920 USA;

    Govt French Polynesia Delegat Rech BP 20981 Tahiti French Polynesi France;

    PSL Res Univ EPHE UPVD CNRS Ctr Rech Insulaires & Observ Environm CRIOBE USR BP 1013 F-98729 Moorea French Polynesi France|Lab Excellence Corail Corail French Polynesi France;

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