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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial variability of intertidal rocky shore assemblages in the northwest coast of Portugal
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Spatial variability of intertidal rocky shore assemblages in the northwest coast of Portugal

机译：葡萄牙西北海岸潮间带岩岸组合的空间变异性

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摘要

The spatial variability of rocky shore assemblages of the northwest Portuguese coast was studied in a total of 12 transects, visited twice between March and August 2003. Each transect was positioned from the upper to the lower shore and four replicate samples (50 x 50 cm) were taken at each visually identified assemblage. Multivariate analysis was used to test the null hypothesis of no significant differences among assemblages located on different heights along the transect and among assemblages located at the same height on different transects. The distribution pattern of organisms along the height was not consistent across transects and significant variability could be found in assemblages located at the same height on the shore. Globally, the variability from the lower to the upper shore (vertical axis) was larger than from transect to transect (horizontal axis) but the distribution pattern along height was clearer in sheltered transects than in exposed ones. The heterogeneity in composition between the visually identified assemblages, within the same transect, was, however, the major source of variability in the study area. In the rocky intertidal northwest coast of Portugal, where tidal amplitude is broad and extremely wave-exposed sites are scarce, height above chart datum was the most important factor determining the distribution and species composition of the assemblages. However, variability along the horizontal axis was also significant and should be considered in studies of spatial patterns of distribution of organisms within this area.
机译：共研究了12个样带，研究了葡萄牙西北海岸岩石海岸组合的空间变异性，在2003年3月至2003年8月之间进行了两次访问。每个样带从上岸到下岸定位，并且有四个重复样本（50 x 50厘米）在每个通过视觉识别的集合处拍摄。多变量分析用于检验零假设，该零假设在沿样条线位于不同高度的组合之间以及在不同样条线位于相同高度的组合之间没有显着差异。跨样带的生物沿高度的分布方式不一致，在岸上相同高度的组合中可发现明显的变异性。在全球范围内，从下到上岸（垂直轴）的变异性大于从横断面到横断面（水平轴）的变异性，但是在隐蔽的横断面上，沿高度的分布模式比在裸露的横断面上更清晰。但是，在同一样带内，视觉识别的组合之间的组成异质性是研究区域变异性的主要来源。在葡萄牙西北部的潮间带岩石海岸中，潮汐幅宽较广，极少暴露于波浪中，因此，海图基准面以上的高度是决定种群分布和物种组成的最重要因素。但是，沿水平轴的可变性也很重要，在研究该区域内生物分布的空间格局时应考虑到这一点。

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