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首页> 外文期刊>Marine ecology progress series >Habitat use patterns and edge effects across a seagrass-unvegetated ecotone depend on species-specific behaviors and sampling methods
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Habitat use patterns and edge effects across a seagrass-unvegetated ecotone depend on species-specific behaviors and sampling methods

机译：海草无植被过渡带的生境使用方式和边缘效应取决于特定物种的行为和采样方法

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摘要

Although habitat edges can be areas of elevated richness and intense ecological interactions, results from studies of mesopredators in seagrass ecosystems are equivocal, with some communities sensitive to the mere presence of seagrass, while others respond specifically to edges and landscape structure. We attempted to address these discrepancies through a species-specific lens, investigating patterns in aggregate and per-taxon mesopredator densities and behaviors across a seagrass-unvegetated ecotone at 3 sites in Washington State, USA, with special focus on patterns apparent on edges. Aggregate abundance was enhanced inside eelgrass (in seines) and on edges (in videos) relative to unvegetated habitats, a difference attributed to the abilities of the 2 methods to sample dominant taxa in different habitats. Both methods concurred that structure-association primarily occurred for pelagic, not benthic taxa. Videos suggested that shiner perch and stickleback moved more slowly in eelgrass interiors relative to unvegetated habitat, that stickleback fed more frequently in interior habitat, and that habitat use did not differ between low and high water. Eelgrass appears to disproportionately benefit small pelagic taxa rather than benthic species, but no distinct responses to edges were detected for the distribution or behavior of dominant taxa. Overall, responses to structure were taxon-specific, and for most taxa, shoot structure seemed more important than landscape structure for distribution and behavior. Our results suggest that the wide variation in community responses to landscape structure found in the literature may result from differences in local species pools, and the ability of sampling gear to detect specific taxa in different habitats.
机译：尽管栖息地边缘可能是富裕度较高且生态相互作用强烈的区域，但是对海草生态系统中的拟捕食者的研究结果是模棱两可的，有些社区仅对海草的存在敏感，而其他社区则对边缘和景观结构特别敏感。我们试图通过特定物种的角度来解决这些差异，研究美国华盛顿州3个地点的海草无植被过渡带中总体和每个分类单元的中子介导密度和行为模式，特别关注边缘明显的模式。相对于没有植被的生境，鳗草内部（围网中）和边缘（视频中）的总丰度得到了增强，这归因于两种方法在不同生境中采样优势类群的能力。两种方法都同意，结构关联主要发生在上层生物分类群中，而不是在底栖生物分类群中。视频表明，相对于无植被的栖息地，鳗鱼内部的光辉鲈鱼和刺背鱼运动更慢，在内部栖息地更频繁地喂食刺背鱼，在低水位和高水位条件下，栖息地的使用没有差异。鳗草似乎对小型中上层生物群而不是底栖生物成比例地受益，但是对于优势类群的分布或行为，未检测到对边缘的明显反应。总体而言，对结构的响应是特定于分类群的，并且对于大多数分类群而言，对于分布和行为，枝条结构似乎比景观结构更重要。我们的结果表明，文献中发现的社区对景观结构的反应差异很大，这可能是由于当地物种库的差异以及采样工具检测不同生境中特定分类群的能力所致。

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