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首页> 外文期刊>Marine ecology >Patterns Of Unsuccessful Shell-crushing Predation Along A Tidal Gradient In Two Geographically Separated Salt Marshes
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Patterns Of Unsuccessful Shell-crushing Predation Along A Tidal Gradient In Two Geographically Separated Salt Marshes

机译：在两个地理上分开的盐沼中，沿着潮汐梯度进行的不成功的壳压捕食模式

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摘要

Gradients in salt marsh ecosystems that result from reduced tidal inundation time in the high marsh offer an opportunity to assess the importance of predation as a selective agent (indexed by the time-averaged record of unsuccessful predation, which integrates potentially confounding short-term - inter-seasonal and inter-annual - fluctuations in predation pressure). Spatial patterns in selection pressure are expected to decrease landward from the seaward edge of the marsh. Interaction between shell-breaking predators and their snail prey, Littoraria irrorata, however, generated a pattern in the frequency of sublethal injury (shell repair), standardized for snail size, that did not follow this simple, single-variable prediction of decreasing repair frequencies with distance from the seaward edge of the marsh, based on inundation time alone. Patterns of repair frequency increased landward from the seaward edge of the marsh, only declining as predicted after a zone of dense stands of salt marsh grass. The interaction of tidal inundation time and primary habitat structure (e.g. physical vegetative barriers to dispersion of predators into the marsh) is hypothesized to shape selection gradients in salt marshes, as inferred from the record of unsuccessful predation.
机译：盐沼生态系统中由高沼泽地潮汐淹没时间减少导致的梯度提供了一个机会，可以评估掠食作为选择剂的重要性（由掠夺不成功的时间平均记录来索引，该记录整合了可能混淆的短期-内部-季节和年度间-捕食压力的波动）。选择压力的空间格局有望从沼泽的海缘向内减少。但是，破壳捕食者与其蜗牛猎物Littoraria irrorata之间的相互作用在亚致死性伤害（壳修复）的频率上产生了一个模式，该模式已针对蜗牛的大小进行了标准化，没有遵循这种简单的，单变量预测的降低修复频率的趋势距沼泽沿海边缘的距离，仅基于淹没时间即可。修复频率的模式从沼泽的沿海边缘向内增加，仅在盐沼草茂密的一带之后才下降。根据未成功捕食的记录推断，潮汐淹没时间与主要生境结构（例如，食肉动物向沼泽中扩散的物理营养屏障）之间的相互作用被认为可以塑造盐沼中的选择梯度。

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