竞争性排斥推动了岛屿上白蚁群落的集结过程

IF 4 2区 环境科学与生态学 Q1 ECOLOGY
Yuanyuan Luo, Donghao Wu, Changlu Weng, Wenjie Zhou, Mingjian Yu, Aiying Zhang
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引用次数: 0

摘要

背景生物过滤(包括环境过滤和扩散过滤)经常被观察到,导致栖息地破碎化后多样性降低,物种组合更加相似。我们研究了陆桥岛屿上白蚁群落的主要集结过程,重点是以高领地性著称的物种。我们假设,竞争优势物种往往会占据更有利的栖息地,如较大和较不孤立的岛屿。因此,我们预计物种群落的多样性和相似性会比预期的要低。通过将观察到的模式与随机生成的群落(即随机过程)进行比较,我们量化了岛屿面积和隔离度对分类、系统发育和功能多样性的标准化影响。结果我们发现,在面积较大和隔离程度较低的岛屿上,白蚁的分类、系统发育和功能多样性都比预期的低,这表明竞争排斥是形成 TIL 白蚁群落的主要机制。PGLMM显示,两个体型较大的真菌生长物种随着竞争强度的增加而增加,而其他物种则表现出消极反应。值得注意的是,与其他觅食类群相比,长菌类群的数量随岛屿面积的增加而急剧增加,随隔离程度的增加而急剧减少。结论:我们的研究强调了竞争排斥在白蚁群落形成过程中的重要作用,并强调在预测生境破碎化导致的群落结构变化和生物多样性损失时,需要同时考虑物种或功能组之间的竞争差异和生态位差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Competitive exclusion drives termite community assembly process on islands

Competitive exclusion drives termite community assembly process on islands

Context

Abiotic filtering, including environmental and dispersal filtering, is frequently observed resulting in reduced diversity and more similar species assemblages following habitat fragmentation. Nonetheless, the significance of competitive exclusion is often underestimated.

Objectives

We investigated the dominant assembly process among termite communities on land-bridge islands, focusing on species known for their high territoriality. We hypothesized that competitively superior species tend to dominate more favorable habitats, such as larger and less isolated islands. Consequently, we anticipated lower diversity and greater similarity in species assemblages than would be expected.

Methods

Termite communities were surveyed using standardized transects on 24 islands. We quantified the standardized effects of island area and isolation on taxonomic, phylogenetic and functional diversity by comparing observed patterns with randomly generated communities (i.e., stochastic process). A phylogenetic generalized linear mixed model (PGLMM) was conducted to examine species-specific responses to environmental factors and competition intensity (i.e., heterospecific abundance).

Results

We found that taxonomic, phylogenetic and functional diversity were lower than expected on larger and less isolated islands, suggesting that competitive exclusion was the dominant mechanism shaping termite communities in TIL. PGLMM showed that two fungus-growing species with larger body sizes increased with competition intensity, while other species exhibited negative responses. Notably, the abundance of fungus-growing species showed sharper increase with island area and decrease with isolation compared to other feeding groups. These findings demonstrate that competitively superior species prefer high-quality habitats and are more sensitive to habitat fragmentation.

Conclusions

Our study highlights the significance of competitive exclusion in shaping termite communities and emphasizes the need to consider both competitive and niche difference among species or functional groups when predict changes in community structure and biodiversity loss resulting from habitat fragmentation.

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来源期刊
Landscape Ecology
Landscape Ecology 环境科学-地球科学综合
CiteScore
8.30
自引率
7.70%
发文量
164
审稿时长
8-16 weeks
期刊介绍: Landscape Ecology is the flagship journal of a well-established and rapidly developing interdisciplinary science that focuses explicitly on the ecological understanding of spatial heterogeneity. Landscape Ecology draws together expertise from both biophysical and socioeconomic sciences to explore basic and applied research questions concerning the ecology, conservation, management, design/planning, and sustainability of landscapes as coupled human-environment systems. Landscape ecology studies are characterized by spatially explicit methods in which spatial attributes and arrangements of landscape elements are directly analyzed and related to ecological processes.
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