Eutrophication modifies the relationships between multiple facets of macroinvertebrate beta diversity and geographic distance in freshwater lakes

IF 4.6 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Diversity and Distributions Pub Date : 2024-03-15 DOI:10.1111/ddi.13830
Xiaoming Jiang, Duo Peng, Janne Alahuhta, Jani Heino, Zhengfei Li, Zhicai Xie
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Abstract

Aim

Understanding the distance–decay relationship (DDR) has been considered important because it reflects a combination of several ecological processes such as dispersal limitation and environmental sorting. However, effects of human disturbances on DDR are poorly known, especially in freshwater lakes. This study is aimed to examine how anthropogenic eutrophication modified the relationships between three facets (taxonomic, functional and phylogenetic) of macroinvertebrate beta diversity and geographic and environmental distances across 30 freshwater lakes.

Location

The Yangtze River floodplain, China.

Methods

We used Mantel tests to examine the relationships between multiple facets of assemblage dissimilarities (overall beta diversity, replacement and richness difference components) and geographic and environmental distances. Distance-based redundancy analysis (dbRDA) and associated variation partitioning procedures were applied to explore the relative contributions of environmental and spatial factors on the three facets of beta diversity.

Results

We found that none of the three beta diversity facets was related to geographic distance, but all were significantly related to environmental distance, mainly mirroring eutrophication-related variables. Based on the variation partitioning approach, the macroinvertebrate assemblages examined were almost exclusively structured by environmental factors associated with eutrophication, while spatial variables had a negligible effect. Nevertheless, the different facets of beta diversity did not decrease (i.e., no homogenization trend) in lake groups showing the highest eutrophication levels, implying complex influences of anthropogenic disturbances in driving homogenization or differentiation in assemblage compositional dissimilarity.

Main Conclusions

Our findings suggested that the high degrees of eutrophication acted as an environmental filter to significantly modify the spatial distance–decay relationships, possibly via decreasing the importance of dispersal limitation in shaping macroinvertebrate assemblages in the studied lakes. Given the sensitivity of beta diversity patterns to eutrophication we found in this study, we recommend that the role of anthropogenic disturbances should be incorporated into research on general ecological patterns like the DDR.

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富营养化改变了淡水湖中大型无脊椎动物贝塔多样性的多个方面与地理距离之间的关系
目的 了解距离衰减关系(DDR)一直被认为是非常重要的,因为它反映了若干生态过程的组合,如扩散限制和环境分选。然而,人们对人类干扰对距离衰减关系的影响知之甚少,尤其是在淡水湖泊中。本研究旨在探讨人为富营养化如何改变30个淡水湖泊中大型无脊椎动物β多样性的三个方面(分类、功能和系统发育)与地理和环境距离之间的关系。结果 我们发现,三个贝塔多样性分量均与地理距离无关,但均与环境距离显著相关,主要反映了富营养化相关变量。根据变异分区法,所研究的大型无脊椎动物群几乎完全由与富营养化相关的环境因素构成,而空间变量的影响微乎其微。尽管如此,在富营养化程度最高的湖泊群中,贝塔多样性的不同方面并没有减少(即没有同质化趋势),这意味着人为干扰在驱动集合体组成差异的同质化或差异化方面具有复杂的影响。鉴于我们在本研究中发现的贝塔多样性模式对富营养化的敏感性,我们建议应将人为干扰的作用纳入到像DDR这样的一般生态模式的研究中。
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来源期刊
Diversity and Distributions
Diversity and Distributions 环境科学-生态学
CiteScore
8.90
自引率
4.30%
发文量
195
审稿时长
8-16 weeks
期刊介绍: Diversity and Distributions is a journal of conservation biogeography. We publish papers that deal with the application of biogeographical principles, theories, and analyses (being those concerned with the distributional dynamics of taxa and assemblages) to problems concerning the conservation of biodiversity. We no longer consider papers the sole aim of which is to describe or analyze patterns of biodiversity or to elucidate processes that generate biodiversity.
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