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Dispersal mitigates bacterial dominance over microalgal competitor in metacommunities.
Oecologia ( IF 2.7 ) Pub Date : 2020-07-09 , DOI: 10.1007/s00442-020-04707-8
Friederike G Engel 1, 2, 3 , Francisco Dini-Andreote 4, 5 , Britas Klemens Eriksson 2 , Joana Falcao Salles 2 , Maria Julia de Lima Brossi 2 , Birte Matthiessen 3
Affiliation  

Ecological theory suggests that a combination of local and regional factors regulate biodiversity and community functioning in metacommunities. The relative importance of different factors structuring communities likely changes over successional time, but to date this concept is scarcely documented. In addition, the few studies describing successional dynamics in metacommunity regulation have only focused on a single group of organisms. Here, we report results of an experimental study testing the effect size of initial local community composition and dispersal between local patches on community dynamics of benthic microalgae and their associated bacteria over community succession. Our results show that over time dispersal outweighed initial effects of community composition on microalgal evenness and biomass, microalgal β-diversity, and the ratio of bacteria to microalgae. At the end of the experiment (ca. 20 microalgae generations), dispersal significantly decreased microalgal evenness and β-diversity by promoting one regionally superior competitor. Dispersal also decreased the ratio of bacteria to microalgae, while it significantly increased microalgal biomass. These results suggest that the dispersal-mediated establishment of a dominant and superior microalgae species prevented bacteria from gaining competitive advantage over the autotrophs in these metacommunities, ultimately maintaining the provision of autotrophic biomass. Our study emphasizes the importance of time for dispersal to be a relevant community-structuring mechanism. Moreover, we highlight the need for considering multiple competitors in complex metacommunity systems to properly pinpoint the consequences of local change in dominance through dispersal for metacommunity function.



中文翻译:

分散减轻了超群落中细菌对微藻竞争者的控制。

生态学理论表明,地方和区域因素的结合调节了元社区的生物多样性和社区功能。构建社区的不同因素的相对重要性可能会随着时间的推移而发生变化,但迄今为止,这一概念鲜有记载。此外,很少有研究描述元社区调控中的演替动态,这些研究仅集中于一组生物。在这里,我们报告了一项实验研究的结果,该实验测试了初始局部群落组成的影响大小以及局部斑块之间对底栖微藻及其相关细菌在群落演替中的群落动态的分散作用。我们的结果表明,随着时间的流逝,散布的作用超过了群落组成对微藻均匀度和生物量,微藻β多样性,以及细菌与微藻的比例。在实验结束时(约20个微藻世代),通过促进一个区域优势竞争者,分散显着降低了微藻的均匀度和β多样性。分散还降低了细菌与微藻的比例,同时显着增加了微藻的生物量。这些结果表明,在优势和优势微藻物种的传播介导的建立中,细菌无法获得这些亚群落中自养生物的竞争优势,从而最终维持了自养生物质的提供。我们的研究强调了传播时间成为相关社区构建机制的重要性。此外,

更新日期:2020-07-09
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