Decoupling species richness variation and spatial turnover in beta diversity across a fragmented landscape
Decoupling species richness variation and spatial turnover in beta diversity across a fragmented landscape
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将碎片化景观中的物种丰富度变化与β多样性的空间周转解耦
DOI：
10.7717/peerj.6714
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发表时间：
2019-04-10
期刊：
影响因子：
2.7
通讯作者：
Yu, Mingjian
中科院分区：
文献类型：
--
作者：
Hu, Guang;Wilson, Maxwell C.;Yu, Mingjian
生境破碎化如何影响地方丰富度与群落组成的空间变化之间的关系，对生态学和保护生物学都很重要，但对这种影响的认识尚不充分。本文以千岛湖破碎化景观为研究对象进行了实证研究。千岛湖是一个由1000多个岛屿组成的人工陆桥岛屿系统，它提供了一个具有均匀基质和相似演替历史的“实验性”破碎化景观。研究了29个岛屿的物种组成和植物功能类型（PFT），考察了岛屿面积和隔离程度对α-和β-多样性关系的影响。采用一般线性模型对生境破碎化的影响进行检验。此外，利用变异分块法对植物群落β-多样性依赖和α-多样性不依赖的空间周转进行解耦。结果生境破碎化主要通过改变局地α-多样性影响植物β-多样性，而不是通过改变局地α-多样性影响植物β-多样性。我们还发现，区域依赖的环境过滤和不同功能类型的植物反应差异是最可能的潜在驱动机制。这些结果突出了破碎景观中不同尺度生物多样性组成部分之间的等级联系的重要性，并具有实际的保护意义。
Background How habitat fragmentation affects the relationship between local richness and the variation in community composition across space is important to both ecology and conservation biology, but this effect remains poorly understood. Methods Here, we present an empirical study to address this topic in a fragmented landscape, the Thousand Island Lake (TIL), an artificial land-bridge island system with more than 1,000 islands, which provides an “experimental” fragmented landscape with a homogeneous matrix and similar successional history. We measured species composition and plant functional type (PFT) on 29 islands, and tested the effects of island area and isolation on the relationship between α- and β-diversity. General Linear Models were applied to test the impact of habitat fragmentation. In addition, variation partitioning was used to decouple α-diversity dependent and α-diversity independent spatial turnover in β-diversity of the plant community and across different PFTs. Results We found habitat fragmentation influences β-diversity of plants primarily by modifying local α-diversity, not spatial turnover in the TIL system. We also found area-dependent environmental filtering and differential plant responses across functional types were the most likely underlying driving mechanisms. Discussion These results highlight the importance of hierarchical linkages between components of biodiversity across scales in fragmented landscapes, and have practical conservation implications.