Fish body sizes change with temperature but not all species shrink with warming
Fish body sizes change with temperature but not all species shrink with warming
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DOI：
10.1038/s41559-020-1171-0
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发表时间：
2020-04-06
影响因子：
16.8
通讯作者：
Blanchard, Julia L.
中科院分区：
文献类型：
--
作者：
Audzijonyte, Asta;Richards, Shane A.;Blanchard, Julia L.
变温动物在实验变暖下通常会缩小，但这种模式是否会延伸到野生种群还不确定。我们分析了1000万份视觉调查记录，跨越澳大利亚大陆和几十年，包括最常见的沿海珊瑚礁鱼类（335种）。我们发现温度确实驱动了鱼类身体大小的时空变化，但并不总是以预期的消极方式。在温暖的水域中，大约55%的物种体型较小（尤其是体型较小的物种），而45%的物种体型较大。在任何给定地点，一个物种对温度的空间响应方向通常与它对温度上升的时间响应一致，这表明空间趋势可以帮助预测鱼类对长期变暖的反应。然而，时间变化比空间趋势快10倍左右（在空间和时间上，每变化1摄氏度，体型变化分别为4%和40%）。鱼类大小对变暖的快速和变化的反应可能预示着对生态系统重构的意想不到的影响，其潜在后果比所有物种都在萎缩的后果更大。在355种沿海珊瑚礁鱼类中，体型随变暖而变化，但体型对变暖的响应方向与对温度变化的响应方向总体上是一致的，而不是总体上是负的。
Ectotherms generally shrink under experimental warming, but whether this pattern extends to wild populations is uncertain. We analysed ten million visual survey records, spanning the Australian continent and multiple decades and comprising the most common coastal reef fishes (335 species). We found that temperature indeed drives spatial and temporal changes in fish body size, but not consistently in the negative fashion expected. Around 55% of species were smaller in warmer waters (especially among small-bodied species), while 45% were bigger. The direction of a species' response to temperature through space was generally consistent with its response to temperature increase through time at any given location, suggesting that spatial trends could help forecast fish responses to long-term warming. However, temporal changes were about ten times faster than spatial trends (4% versus 40% body size change per 1 degrees C change through space and time, respectively). The rapid and variable responses of fish size to warming may herald unexpected impacts on ecosystem restructuring, with potentially greater consequences than if all species were shrinking.In 355 coastal coral reef fish species, body size changed with warming, but the direction of a species' body size response to warming through time was generally consistent with its response to temperature changes through space, rather than generally negative.