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首页> 外文期刊>Global change biology >Caribbean mesophotic coral ecosystems are unlikely climate change refugia
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Caribbean mesophotic coral ecosystems are unlikely climate change refugia

机译：加勒比海的中生珊瑚生态系统不太可能发生气候变化

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摘要

Deeper coral reefs experience reduced temperatures and light and are often shielded from localized anthropogenic stressors such as pollution and fishing. The deep reef refugia hypothesis posits that light-dependent stony coral species at deeper depths are buffered from thermal stress and will avoid bleaching-related mass mortalities caused by increasing sea surface temperatures under climate change. This hypothesis has not been tested because data collection on deeper coral reefs is difficult. Here we show that deeper (mesophotic) reefs, 30-75m depth, in the Caribbean are not refugia because they have lower bleaching threshold temperatures than shallow reefs. Over two thermal stress events, mesophotic reef bleaching was driven by a bleaching threshold that declines 0.26 degrees C every +10m depth. Thus, the main premise of the deep reef refugia hypothesis that cooler environments are protective is incorrect; any increase in temperatures above the local mean warmest conditions can lead to thermal stress and bleaching. Thus, relatively cooler temperatures can no longer be considered a de facto refugium for corals and it is likely that many deeper coral reefs are as vulnerable to climate change as shallow water reefs.
机译：较深的珊瑚礁温度和光线均会降低，并且通常会受到局部人为压力（例如污染和捕鱼）的影响。暗礁避难所假说认为，在更深的深度处，依赖光的石质珊瑚物种可以免受热应力的影响，并且可以避免因气候变化导致海面温度升高而引起的与漂白相关的生物死亡。由于很难收集更深的珊瑚礁的数据，因此尚未验证该假设。在这里，我们表明，加勒比海中深于30-75m的珊瑚礁不是浮游生物，因为它们的漂白阈值温度低于浅礁。在两次热应力事件中，中晶礁的漂白是由每+ 10m深度下降0.26摄氏度的漂白阈值驱动的。因此，较冷的环境具有保护性的深礁避难所假说的主要前提是不正确的。温度超过当地平均最温暖条件的任何升高都可能导致热应力和漂白。因此，相对较低的温度不再被认为是珊瑚的避难所，很可能许多较深的珊瑚礁和浅水珊瑚礁一样容易受到气候变化的影响。

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