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Spatial variability of the surf zone fish and macroinvertebrate community within dissipative sandy beaches in Oregon, USA

机译：美国俄勒冈州耗散沙滩中冲浪区鱼类和大型无脊椎动物群落的空间变异性

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摘要

Habitat heterogeneity can influence biological communities by providing a diversity of areas that can be occupied by different species. Sandy beach surf zones are often considered homogenous environments; however, sand bars moved by currents and waves can produce trench-like shapes or troughs that provide heterogeneity. The influence of habitat heterogeneity produced by sand movement is unclear despite the fact that surf zones are an important habitat for larval and juvenile fish and macrocrustaceans. To determine if, and how, the fish and macroinvertebrate communities present in trough and non-trough or flat areas of Oregon surf zones differ, we compared species assemblages in both areas at three beaches adjacent to estuary mouths over 2years. Troughs had different communities compared with flat areas, with higher total catch (mean±SD=123.2±122.1 versus 43.6±44.5 individuals×100m−2) and taxon richness (6.7±2.7 versus 4.0±2.3 taxa); these differences were potentially due to water movement, prey availability and sediment size. The fish and macroinvertebrate communities did not vary between years but there were significant differences among beaches, with the most distinct community present at the only beach adjacent to an estuary without a jetty at its mouth, which was possibly due to higher species movement between the surf zones and estuary. Fish and macrocrustacean surf zone communities varied spatially within and among beaches in relation to habitat heterogeneity provided by sand movement and, potentially, the influence of adjacent habitats.
机译：栖息地异质性可以通过提供可以被不同物种占据的多种区域来影响生物群落。沙滩冲浪区通常被认为是同质的环境。但是，由于电流和波浪移动的沙洲会产生类似沟槽的形状或沟槽，从而产生异质性。尽管冲浪区是幼鱼，幼鱼和大型甲壳类动物的重要生境，但沙运动产生的生境异质性的影响尚不清楚。为了确定俄勒冈海浪区的低谷和非低谷或平坦区域中存在的鱼类和大型无脊椎动物群落是否以及如何变化，我们比较了过去2年中两个区域在与河口相接的三个海滩上的物种组成。与平坦地区相比，海槽具有不同的群落，总捕获量较高（平均值±SD = 123.2±122.1对43.6±44.5个个体×100m-2）和分类群丰富度（6.7±2.7对4.0±2.3类群）；这些差异可能是由于水的流动，​​猎物的可利用性和沉积物的大小。鱼类和大型无脊椎动物群落在多年间没有变化，但是海滩之间存在显着差异，其中最独特的群落出现在河口附近唯一的海滩上，而河口处没有码头，这可能是由于海浪之间的物种迁移增加所致。区和河口。鱼类和大型甲壳类动物的冲浪带群落在海滩内和海滩之间的空间变化与沙子运动带来的栖息地异质性以及潜在的邻近栖息地的影响有关。

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