The legacy of stress: Coral bleaching impacts reproduction years later
The legacy of stress: Coral bleaching impacts reproduction years later
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DOI：
10.1111/1365-2435.13653
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发表时间：
2020-08-21
影响因子：
5.2
通讯作者：
Toonen, Robert J.
中科院分区：
文献类型：
--
作者：
Johnston, Erika C.;Counsell, Chelsie W. W.;Toonen, Robert J.
种群在环境压力下的持续程度取决于在压力下存活的个体的生殖产出。在珊瑚系统中，珊瑚在水温升高的压力下会变白。然而，在接下来的几年里，人们对热应激在多大程度上损害了幸存者的繁殖能力知之甚少，这限制了预测种群在人类世中将如何持续的能力。利用组织学量化每个息肉的卵母细胞和精子的丰度和大小，我们测试了2015年夏威夷群岛大规模漂白事件后，漂白如何在两个繁殖季节损害珊瑚的生殖反应。我们发现，较小的群落不仅有更大的漂白可能性，而且在更长的时间内遭受更大的生殖影响。相比之下，无论漂白程度如何，较大的菌落都能产生相当的生殖产量，尽管漂白后的菌落在漂白后一年产生较小的卵母细胞。这些结果表明，白化对生殖的影响比通常认为的更为复杂和具体。因此，对白化死亡率的估计可能低估了热应激对种群的真正影响，特别是当种群因重复和共同发生的压力而失去较大的个体时。在本文的支持信息中可以找到一个免费的简单语言摘要。
The extent to which populations persist under environmental stress depends on the reproductive output of individuals that survive the stress. In coral systems, corals bleach in response to stress from elevated water temperature. However, little is known of the extent to which thermal stress impairs the reproductive capacity of the survivors over the following years, limiting the capacity to predict how populations will persist in the Anthropocene. Using histology to quantify the abundance and size of oocytes and spermaries per polyp, we tested how bleaching impairs the reproductive response of the coralPocillopora meandrinaover two reproductive seasons following the 2015 mass bleaching event in the Hawaiian Islands. We found that smaller colonies not only had a greater probability of bleaching but also suffered greater reproductive impacts over a longer time. In contrast, larger colonies generated comparable reproductive output regardless of bleaching severity, although bleached colonies generated smaller oocytes the year after bleaching. These results show that reproductive impacts of bleaching are more complex and size-specific than commonly assumed. Therefore, estimates of bleaching mortality may underestimate the true impact of thermal stress on populations, especially as populations lose larger individuals from repeated and co-occurring stressors. A freePlain Language Summarycan be found within the Supporting Information of this article.