Waves cue distinct behaviors and differentiate transport of congeneric snail larvae from sheltered versus wavy habitats
Waves cue distinct behaviors and differentiate transport of congeneric snail larvae from sheltered versus wavy habitats
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波浪提示不同的行为，并区分同属蜗牛幼虫从受庇护的栖息地和波浪栖息地的运输
DOI：
10.1073/pnas.1804558115
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Christman, Adam J.
中科院分区：
文献类型：
--
作者：
Fuchs, Heidi L.;Gerbi, Gregory P.;Hunter, Elias J.;Christman, Adam J.
海洋种群动态通常取决于生存几率极小的幼虫的扩散，从而为幼虫行为产生选择性压力，从而增强向合适栖息地的运输。一种有趣的可能性是，幼虫利用主导其出生环境的物理信号进行导航。我们使用来自波浪大陆架（Tritia trivittata）和湍流入口（Tritia obsoleta）的同类蜗牛幼虫测试了水流诱导的幼虫行为是否随成虫的物理环境而变化。湍流和水流旋转（涡旋）导致这两个物种游动得更有力，下降得更频繁。加速度是波中最强的信号，它在 T 中引起了剧烈的反应。 trivittata但在主管T中几乎没有反应。过时的。早期T.过时的对加速度的反应，排除了感觉能力的差异。幼虫可能使用静囊来区分湍流涡流和波振荡。静态囊体感知加速度的能力还可以检测来自风和波浪的低频声音。 trivittata 可能会听到在大陆架上提供清晰信号的波浪并做出反应，而 T.过时有效地“充耳不闻”入口处较弱的波浪运动。它们对波浪的不同反应会导致这些幼虫在各自成体栖息地的水柱中向相反的方向移动。模拟表明，同源物的运输模式会在大陆架上出现分歧，这可能会强化这些相似物种的不同生物地理范围。对湍流的反应可能会促进沉降，但不太可能有助于大规模航行，而陆架物种对波浪的反应可能有助于通过斯托克斯漂流在陆架上保留。
Marine population dynamics often depend on dispersal of larvae with infinitesimal odds of survival, creating selective pressure for larval behaviors that enhance transport to suitable habitats. One intriguing possibility is that larvae navigate using physical signals dominating their natal environments. We tested whether flow-induced larval behaviors vary with adults’ physical environments, using congeneric snail larvae from the wavy continental shelf (Tritia trivittata) and from turbulent inlets (Tritia obsoleta). Turbulence and flow rotation (vorticity) induced both species to swim more energetically and descend more frequently. Accelerations, the strongest signal from waves, induced a dramatic response inT. trivittatabut almost no response in competentT. obsoleta. Early stageT. obsoletadid react to accelerations, ruling out differences in sensory capacities. Larvae likely distinguished turbulent vortices from wave oscillations using statocysts. Statocysts’ ability to sense acceleration would also enable detection of low-frequency sound from wind and waves.T. trivittatapotentially hear and react to waves that provide a clear signal over the continental shelf, whereasT. obsoletaeffectively “go deaf” to wave motions that are weak in inlets. Their contrasting responses to waves would cause these larvae to move in opposite directions in the water columns of their respective adult habitats. Simulations showed that the congeners’ transport patterns would diverge over the shelf, potentially reinforcing the separate biogeographic ranges of these otherwise similar species. Responses to turbulence could enhance settlement but are unlikely to aid large-scale navigation, whereas shelf species’ responses to waves may aid retention over the shelf via Stokes drift.
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