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Young fishes persist despite coral loss on the Great Barrier Reef.
Communications Biology ( IF 5.9 ) Pub Date : 2019-12-06 , DOI: 10.1038/s42003-019-0703-0
Sharon Wismer 1 , Sterling B Tebbett 1 , Robert P Streit 1 , David R Bellwood 1
Affiliation  

Unprecedented global bleaching events have led to extensive loss of corals. This is expected to lead to extensive losses of obligate coral-dependent fishes. Here, we use a novel, spatially-matched census approach to examine the nature of fish-coral dependency across two mass coral bleaching events. Despite a >40% loss of coral cover, and the ecological extinction of functionally important habitat-providing Acropora corals, we show that populations of obligate coral-dependent fishes, including Pomacentrus moluccensis, persisted and - critically - recruitment was maintained. Fishes used a wide range of alternate reef habitats, including other coral genera and dead coral substrata. Labile habitat associations of 'obligate' coral-dependent fishes suggest that recruitment may be sustained on future reefs that lack Acropora, following devastating climatic disturbances. This persistence without Acropora corals offers grounds for cautious optimism; for coral-dwelling fishes, corals may be a preferred habitat, not an obligate requirement.

中文翻译:

尽管大堡礁珊瑚消失,幼鱼仍然存在。

史无前例的全球白化事件导致珊瑚大量流失。预计这将导致专性依赖珊瑚的鱼类大量损失。在这里,我们使用一种新颖的、空间匹配的普查方法来研究两次大规模珊瑚白化事件中鱼珊瑚依赖性的性质。尽管珊瑚覆盖面积损失超过 40%,并且提供功能性重要栖息地的鹿角珊瑚也发生了生态灭绝,但我们发现,专性依赖珊瑚的鱼类(包括 Pomacentrus moluccensis)的种群持续存在,并且至关重要的是,它们的补充得以维持。鱼类使用广泛的备用珊瑚礁栖息地,包括其他珊瑚属和死珊瑚基​​质。“专性”依赖珊瑚的鱼类的不稳定栖息地关联表明,未来缺乏鹿角珊瑚的珊瑚礁可能会持续补充,毁灭性的气候扰动之后。这种没有鹿角珊瑚的持续现象为谨慎乐观提供了理由。对于珊瑚鱼类来说,珊瑚可能是首选栖息地,而不是强制性要求。
更新日期:2019-12-06
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