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A developmental bottleneck in dispersing larvae: implications for spatial population dynamics

机译：幼虫扩散的发展瓶颈：对空间种群动态的影响

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摘要

We found evidence for a critical population bottleneck at a developmental-stage transition in larvae of the zebra mussel Dreissena polymorpha Pallas from field estimates of mortality. Identification of this critical period in the field was made possible by closely tracking cohorts of larvae over 5 days of development as they dispersed 128 km in a river system. The presence of a survival bottleneck during development was confirmed in laboratory studies of zebra mussel larvae. Development-specific mortality has important implications for spatial population dynamics of the zebra mussel in particular, and all species with indirect development in general. Marine reserves that do not take development-specific mortality into account may dramatically underestimate reserve size needed to protect rare and/or exploited marine populations. Conversely, for the zebra mussel, the lower contribution of dispersing individuals to population growth downstream of reserves can lead to more feasible control through the blocking of dispersal.
机译：我们从死亡率的现场估计中找到了斑马贻贝Dreissena polymorpha Pallas幼虫发育阶段过渡的关键种群瓶颈的证据。通过密切跟踪幼虫在5天的发育过程中分散在河流系统中128 km，可以确定田间的这一关键时期。斑马贻贝幼虫的实验室研究证实了发育过程中存在生存瓶颈。特定于发展的死亡率尤其对斑马贻贝以及总体上具有间接发育的所有物种的空间种群动态具有重要影响。不考虑特定于发展的死亡率的海洋保护区可能会大大低估保护稀有和/或被开发海洋种群所需的保护区规模。相反，对于斑马贻贝而言，分散个体对储备下游人口增长的贡献较小，可以通过阻止扩散来实现更可行的控制。

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