Effects of abiotic heterogeneity on species densities and interaction strengths lead to different spatial biodiversity patterns
Effects of abiotic heterogeneity on species densities and interaction strengths lead to different spatial biodiversity patterns
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DOI：
10.3389/fevo.2023.1071375
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Samantha A Catella;Karen C. Abbott
中科院分区：
文献类型：
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作者：
Samantha A Catella;Karen C. Abbott
在群落聚集过程中，非生物因素可以在物种生活史的多个阶段影响物种，例如，通过影响早期定居或建立的概率，从而影响初始密度（途径1：对密度的非生物效应），或在随后的生命阶段通过影响生物相互作用的强度（途径2：对相互作用强度的非生物效应）。由于真实的非生物景观是多元而复杂的，这两种不同的非生物影响途径如何影响群落模式尚未被量化。利用基于个体的空间显式模拟模型，我们比较了具有独特非生物生态位的植物物种在非生物条件下形成初始密度、相互作用强度或两者兼有的情景。然后，我们将非生物景观对群落格局的影响划分为由可变密度、可变相互作用强度及其相互作用引起的组成部分。即使植物对相同的景观做出响应，不同的密度和不同的相互作用强度导致不同的群落模式，它们的综合效应是非加性的。不同的密度促进了更多的空间结构，而不同的相互作用强度促进了更高的本地物种丰富度。我们强调了这些发现在应用植物群落生态学中的重要意义。
During community assembly, abiotic factors can influence species at multiple stages during their life history, for example by affecting early settlement or establishment probabilities and thus initial densities (route 1: abiotic effects on density), or later by affecting the strength of biotic interactions during subsequent life stages (route 2: abiotic effects on interaction strengths). Since real abiotic landscapes are multivariate and complex, how these two distinct routes of abiotic influence affect community patterns has not been quantified. Using an individual-based spatially explicit simulation model, we compared scenarios where abiotic conditions shaped initial densities, interaction strengths, or both, of plant species with unique abiotic niches. We then partitioned the effect of the abiotic landscape on community patterns into components arising from variable density, variable interaction strengths, and their interaction. Even when plants responded to identical landscapes, variable density and variable interaction strengths led to different community patterns, and their combined effects were non-additive. Variable density promoted more spatial structure, while variable interaction strengths promoted higher local species richness. We highlight important implications these findings have in applied plant community ecology.