Pelagic Larval Duration and Dispersal Distance Revisited
Pelagic Larval Duration and Dispersal Distance Revisited
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DOI：
10.1086/bblv216n3p373
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
A. Shanks
中科院分区：
文献类型：
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作者：
A. Shanks
我目前的传播距离为44种繁殖持续时间（PD）的数据，其中40个。将数据与Shanks等人（2003; Ecol.Appl.13：S159-S169）的数据相结合，提供了67个物种的信息。PD和扩散距离是相关的，但有许多例外。扩散距离呈双峰分布。许多PD超过1天的物种分散不到1公里，而其他物种分散数十至数百公里。具有较短的扩散距离的生物是浮游的短暂或保持接近底部，而远洋。被动扩散繁殖体的模型充分预测了PD短（<1天）的生物体的扩散距离，但高估了PD长的生物体的扩散距离。这些模型预测，繁殖体被运送到离岸数十公里的地方;然而，许多类型的繁殖体仍留在沿海边界层内，那里的水流速度较慢，变化更大，导致扩散速度低于预测。在短PD，从遗传数据估计的扩散距离是类似的观察。在长PD，遗传数据通常高估了扩散距离。这种差异可能是由于稀有个体的影响，它们分散在很远的地方，从而消除了种群之间的遗传差异。幼虫的行为和物种的生活史特征可以在决定扩散距离方面发挥关键作用。
I present dispersal distances for 44 species with data on propagule duration (PD) for 40 of these. Data were combined with those in Shanks et al. (2003; Ecol. Appl. 13: S159–S169), providing information on 67 species. PD and dispersal distance are correlated, but with many exceptions. The distribution of dispersal distances was bimodal. Many species with PDs longer than 1 day dispersed less than 1 km, while others dispersed tens to hundreds of kilometers. Organisms with short dispersal distances were pelagic briefly or remained close to the bottom while pelagic. Null models of passively dispersing propagules adequately predict dispersal distance for organisms with short PDs (<1 day), but overestimate dispersal distances for those with longer PDs. These models predict that propagules are transported tens of kilometers offshore; however, many types remain within the coastal boundary layer where currents are slower and more variable, leading to lower than predicted dispersal. At short PDs, dispersal distances estimated from genetic data are similar to observed. At long PDs, genetic data generally overestimate dispersal distance. This discrepancy is probably due to the effect of rare individuals that disperse long distances, thus smoothing genetic differences between populations. Larval behavior and species’ life-history traits can play a critical role in determining dispersal distance.