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Scales of similarity in soft sediment epibenthic assemblages: implications for marine protected area design

机译：软沉积物表皮组合中的相似尺度：对海洋保护区设计的影响

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Remote videography was used to investigate relationships between biological similarity and distance in Moreton Bay, Australia at site (1 km) and local (10 km) scales, and for separate biotic groups. Numerical analysis using Mantel's tests to compare distance and similarity matrices showed that at both scales there was a negative correlation between similarity and distance, in that sites further apart were less similar than sites close together. The relationship, although significant (p<0.001), was quite weak (R-2=5%) at the site-scale, with no significant (ANOVA with Tukey's pairwise comparisons, p>0.05) decline in similarity up to distances of 2.1-2.6 km. At the local-scale, between-site similarity was high (mean Bray-Curtis similarity >30% for 4th root transformed data) at scales of 10 km or less, and declined markedly with increasing distance. Scales of similarity for different broad taxonomic and functional groups within Moreton Bay were broadly consistent between groups and with the complete dataset. There was evidence of patchiness in the distributions of seagrass and anthozoans at scales less than 16 km. In other biotic groups there was an essentially monotonic decline in similarity with distance. The study showed that the spatial classification approach to habitat mapping is valid in this case, and that site spacing of less than 10 km is necessary to capture important components of biological similarity. Site spacing of less than 2.5 km does not appear to be warranted to capture additional components of biological similarity at the scales studied.
机译：远程摄录被用来调查澳大利亚摩顿湾站点（1 km）和本地尺度（10 km）的生物相似度和距离之间的关系，以及单独的生物群。使用Mantel的测试进行数值分析以比较距离和相似度矩阵，结果表明，在两个尺度上，相似度和距离之间都存在负相关关系，因为相距较近的站点比彼此靠近的站点的相似性小。该关系尽管显着（p <0.001），但在站点范围内却非常弱（R-2 = 5％），在2.1距离范围内相似性均无显着下降（ANOVA与Tukey的成对比较，p> 0.05）。 -2.6公里在局部尺度上，站点间相似度在10 km或更小的范围内较高（对于第4个根转换数据，平均Bray-Curtis相似度> 30％），并且随着距离的增加而显着下降。摩尔顿湾内不同的广泛生物分类和功能组的相似度在各组之间以及与完整的数据集基本一致。在小于16 km的尺度上，海草和拟虫的分布有斑块迹象。在其他生物类别中，相似性随距离基本下降。研究表明，在这种情况下，用于栖息地测绘的空间分类方法是有效的，并且站点间距小于10 km对于捕获生物相似性的重要组成部分是必需的。小于2.5 km的站点间距似乎并不能保证在所研究的范围内捕获具有生物学相似性的其他成分。

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