Community composition influences ecosystem resistance and production more than species richness or intraspecific diversity
Community composition influences ecosystem resistance and production more than species richness or intraspecific diversity
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DOI：
10.1111/oik.08473
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发表时间：
2021-06-21
期刊：
影响因子：
3.4
通讯作者：
Stark, Lloyd R.
中科院分区：
文献类型：
--
作者：
Bowker, Matthew A.;Rengifo-Faiffer, M. Cristina;Stark, Lloyd R.
生物多样性描述了生命的多样性，并可能影响生态系统的特性和过程，如生物量生产和抗干扰能力。我们调查了生物多样性的多个方面的影响-物种丰富度和组成的社会，种内多样性在两个关键物种-生产和电阻的实验组装的生物土壤结皮（生物结皮）。我们发现，生产力的影响最强烈的社区组成（社区成员的存在和相对比例的变化），弱的正影响物种丰富度。种内多样性，包括丰富度和组成的克隆，有一个中性的影响，在一个焦点物种（Syntrichia caninervis）的群落生产力，但在其他焦点物种（S。ruralis）。抗性也是最强烈的社区组成的影响，虽然不同的物种集的阻力和生产的贡献最大。抗性不受物种丰富度或种内多样性的影响。我们的研究结果支持了我们的普遍预期，即生物多样性的社区层面将比物种内的多样性更有影响力，因为物种之间的性状变异通常大于物种内的性状变异。这些结果还表明，虽然物种丰富度通常被认为强烈影响生产力和抗性，特定物种的存在，不存在和相对丰富度可能对两者更有影响。在实验中同时操纵生物多样性的多个方面可能会导致更全面地了解生物多样性调节生态系统的各种方式。
Biodiversity describes the variety of life and may influence properties and processes of ecosystems, such as biomass production and resistance to disturbance. We investigated the effects of multiple facets of biodiversity - species richness and composition of the community, and intraspecific diversity in two key species - on both production and resistance of experimentally-assembled biological soil crusts (biocrusts). We found that productivity was most strongly influenced by community composition (variation in the presence and relative proportions of community members), and weakly positively influenced by species richness. Intraspecific diversity, encompassing both the richness and composition of clones, had a neutral effect on community productivity within one focal species (Syntrichia caninervis), but a moderately negative effect on productivity within the other focal species (S. ruralis). Resistance was also most strongly influenced by community composition, although different sets of species contributed most to resistance and production. Resistance was not affected by either species richness or intraspecific diversity in either focal species. Our findings supported our general expectation that community-level facets of biodiversity would be more influential than intraspecific diversity within a species because trait variability among species is usually greater than that within. These results also indicated that although species richness is often thought to strongly affect both productivity and resistance, the presence, absence and relative abundance of particular species may be more influential to both. Simultaneous manipulation of multiple facets of biodiversity in experiments may lead to a more complete understanding of the variety of ways in which biodiversity may regulate ecological systems.