Spatial and local environmental factors outweigh geo-climatic gradients in structuring taxonomically and trait-based β-diversity of benthic algae

Aim Understanding the variation in biodiversity and its underlying drivers and mechanisms is a core task in biogeography and ecology. We examined (a) the relative contributions of species replacement (i.e., turnover) and richness difference (i.e., nestedness) to taxonomically and trait-based β-diversity of stream benthic algae; (b) whether these two facets of β-diversity are correlated with each other; and (c) the relative contributions of local environmental, geo-climatic and spatial factors to the two facets of β-diversity and their components. Location Hun-Tai River Basin, northeastern China. Taxon Stream benthic algae. Methods A total of 157 sites were sampled. Mantel tests were used to examine the complementarities between the two facets of β-diversity and their components. Distance-based redundancy analysis and variation partitioning were utilized to investigate the relative contributions of local environmental, geo-climatic and spatial factors t...研究目标：探究生物多样性的变异规律及其潜在驱动因子与机制是生物地理学与生态学的核心研究课题。本研究旨在开展以下三方面工作：(a) 解析物种替代（即更替，turnover）与丰富度差异（即嵌套性，nestedness）对河流底栖藻类分类学β多样性（β-diversity）及功能性状β多样性的相对贡献；(b) 分析这两类β多样性维度之间是否存在相关性；(c) 探究局域环境、地理气候及空间因子对这两类β多样性维度及其组分的相对贡献。 研究区域：中国东北浑太河流域。 研究类群：河流底栖藻类。 研究方法：共布设157个采样点位开展野外采样。采用曼特尔检验（Mantel test）分析两类β多样性维度及其组分间的互补性；运用基于距离的冗余分析与变异分区分析，探究局域环境、地理气候及空间因子对[原文后续内容缺失]的相对贡献。