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Temporally varying larval settlement, competition, and coexistence in a sessile invertebrate community

机译：无脊椎动物社区中幼虫的暂时沉降，竞争和共存

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摘要

Storage effect theory describes conditions under which recruitment fluctuation can promote the coexistence of multiple species competing for a single resource. In communities of benthic marine animals, larval settlement is often highly variable, and it has long been suspected that settlement variability promotes coexistence via the storage effect, but no empirical studies have provided quantitative support for this. Here we tested for a necessary component of the storage effect using the bryozoan Watersipora subtorquata, a poor competitor during recruitment. We found that from 2008 to 2009, per capita settlement of W. subtorquata was uncorrelated with the strength of interspecific competition during recruitment; this implies that the storage effect has the potential to promote the persistence of this species. We also found a difference between years in patterns of within-year fluctuation. In 2008, settlement and competition were uncorrelated, while in 2009, settlement and competition were strongly positively correlated, minimizing any role for the storage effect within 2009. The difference between years is due to reduced settlement, in 2009, of a dominant competitor whose settlement phenology differs from that of Watersipora. Our results add to supporting evidence for the storage effect from terrestrial plants and zooplankton, while suggesting that the strength of this mechanism may itself be temporally variable.
机译：储存效应理论描述了招募波动可以促进竞争单一资源的多种物种共存的条件。在底栖海洋动物群落中，幼虫的沉降通常是高度可变的，长期以来人们一直怀疑沉降的可变性通过储藏效应促进了共存，但是没有经验研究对此提供定量支持。在这里，我们使用招募过程中的较差竞争者-苔藓枯水菌（Bryozoan Watersipora subtorquata）测试了储存效果的必要组成部分。我们发现，从2008年到2009年，Sub.quaqua的人均居住地与招募期间种间竞争的强度无关。这意味着储存效应具有促进该物种持久性的潜力。我们还发现年内波动模式的年份之间存在差异。 2008年，结算和竞争是不相关的，而在2009年，结算和竞争是正相关的，从而最大程度地降低了2009年内的存储效应。年之间的差异是由于2009年主要竞争对手的结算减少了造成的物候学不同于Watersipora。我们的研究结果为陆生植物和浮游动物的存储效应提供了支持性证据，同时表明该机制的强度本身可能会随时间变化。

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