Smelling home can prevent dispersal of reef fish larvae
Smelling home can prevent dispersal of reef fish larvae
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DOI：
10.1073/pnas.0606777104
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发表时间：
2007-01-16
影响因子：
11.1
通讯作者：
Miller-Sims, Vanessa
中科院分区：
文献类型：
--
作者：
Gerlach, Gabriele;Atema, Jelle;Miller-Sims, Vanessa
许多海洋鱼类和无脊椎动物显示出双重生活史，定居的成年人产生分散的幼虫。早期幼虫阶段的浮游性表明了一种被动的扩散模式，洋流会迅速在大的空间尺度上引起panmixis，并阻止种群的隔离，这是物种形成的先决条件。然而，珊瑚礁中的高生物多样性和物种丰富度与这种panmixis假说相矛盾。虽然洋流是幼虫扩散的主要力量，但最近的研究表明，滞留量远远超过平流模型的预测。我们研究了动物行为在珊瑚礁鱼类幼体的保留和归巢中的作用，得出了两个重要的发现：（i）定居的幼体能够进行嗅觉辨别，并喜欢它们家礁的气味，从而向我们证明附近的珊瑚礁气味不同。(ii)而一个物种表现出panmixis从我们的平流模型预测，另一个物种表现出显着的遗传种群结构暗示强烈归巢。因此，珊瑚礁的气味可以让幼虫选择水流，将它们送回一般的珊瑚礁，特别是纳塔尔的珊瑚礁。因此，珊瑚礁种群可能产生遗传差异，导致生殖隔离。
Many marine fish and invertebrates show a dual life history where settled adults produce dispersing larvae. The planktonic nature of the early larval stages suggests a passive dispersal model where ocean currents would quickly cause panmixis over large spatial scales and prevent isolation of populations, a prerequisite for speciation. However, high biodiversity and species abundance in coral reefs contradict this panmixis hypothesis. Although ocean currents are a major force in larval dispersal, recent studies show far greater retention than predicted by advection models. We investigated the role of animal behavior in retention and homing of coral reef fish larvae resulting in two important discoveries: (i) Settling larvae are capable of olfactory discrimination and prefer the odor of their home reef, thereby demonstrating to us that nearby reefs smell different. (ii) Whereas one species showed panmixis as predicted from our advection model, another species showed significant genetic population substructure suggestive of strong homing. Thus, the smell of reefs could allow larvae to choose currents that return them to reefs in general and natal reefs in particular. As a consequence, reef populations can develop genetic differences that might lead to reproductive isolation.