Spatial variability in the diversity and structure of faunal assemblages associated with kelp holdfasts (Laminaria hyperborea) in the northeast Atlantic
Spatial variability in the diversity and structure of faunal assemblages associated with kelp holdfasts (Laminaria hyperborea) in the northeast Atlantic
复制标题
东北大西洋与海带固定物（Laminaria hyperborea）相关的动物群落多样性和结构的空间变异性
作者：
H. Teagle;P. Moore;Helen L. Jenkins;D. Smale
海带物种是沿海海洋生态系统中具有重要生态意义的生境形成者，它们为一系列相关生物提供复杂的生物生境，从而改变环境条件并促进当地生物多样性。虽然人们普遍认为海带具有重要的生物多样性，但我们目前对海带相关组合的时空变异性和变异模式的关键环境驱动因素的了解仍然有限。在这里，我们研究了海洋温度和波浪暴露的影响与海带hyperborea，在东北大西洋的主要栖息地形成海带holdfasts的动物群组合的结构。我们从12个以海带为主的开放海岸地点取样，这些地点嵌套在英国的四个地区，纬度约为9°，平均海面温度约为2.7° C。总体而言，holdfast组合是高度多样化的，与261个分类群代表11门记录在整个研究。我们分别研究了固着和移动的类群的空间变异模式，并记录了区域之间，区域内的站点之间，以及两种组合类型的复制holdfasts之间的高变异性。移动的组合结构与温度变化的关系比固着组合结构更密切，固着组合结构主要是由场地水平的变化因素，如波暴露。生物栖息地和相关组合的结构模式没有变化可预见的沿着纬度梯度的温度，表明其他过程跨多个空间和时间尺度的组合结构的重要驱动程序。总体而言，海带holdfasts在英国支持高水平的多样性，这是类似于其他海带为主的系统全球和可比的记录为其他植被海洋栖息地（即海草床），这可能是更广泛地承认其高生物多样性价值。
Kelp species are ecologically-important habitat-formers in coastal marine ecosystems, where they alter environmental conditions and promote local biodiversity by providing complex biogenic habitat for an array of associated organisms. While it is widely accepted that kelps harbour significant biodiversity, our current understanding of spatiotemporal variability in kelp-associated assemblages and the key environmental drivers of variability patterns remains limited. Here we examined the influence of ocean temperature and wave exposure on the structure of faunal assemblages associated with the holdfasts of Laminaria hyperborea, the dominant habitat-forming kelp in the northeast Atlantic. We sampled holdfasts from 12 kelp-dominated open-coast sites nested within four regions across the UK, spanning ~9° in latitude and ~2.7° C in mean sea surface temperature. Overall, holdfast assemblages were highly diverse, with 261 taxa representing 11 phyla recorded across the study. We examined patterns of spatial variability for sessile and mobile taxa separately, and documented high variability between regions, between sites within regions, and between replicate holdfasts for both assemblage types. Mobile assemblage structure was more strongly linked to temperature variability than sessile assemblage structure, which was principally structured by site-level variability in factors such as wave exposure. Patterns in the structure of both biogenic habitat and associated assemblages did not vary predictably along a latitudinal gradient in temperature, indicating that other processes acting across multiple spatial and temporal scales are important drivers of assemblage structure. Overall, kelp holdfasts in the UK supported high levels of diversity, that were similar to other kelp-dominated systems globally and comparable to those recorded for other vegetated marine habitats (i.e. seagrass beds), which are perhaps more widely recognised for their high biodiversity value.