A Randomized Trait Community Clustering approach to unveil consistent environmental thresholds in community assembly

The ISME Journal volume 13, pages2681–2689(2019)Cite this article

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Abstract

Similarities and differences of phenotypes within local co-occurring species hold the key to inferring the contribution of stochastic or deterministic processes in community assembly. Developing both phylogenetic-based and trait-based quantitative methods to unravel these processes is a major aim in community ecology. We developed a trait-based approach that: (i) assesses if a community trait clustering pattern is related to increasing environmental constraints along a gradient; and (ii) determines quantitative thresholds for an environmental variable along a gradient to interpret changes in prevailing community assembly drivers. We used a regional set of natural shallow saline ponds covering a wide salinity gradient (0.1–40% w/v). We identify a consistent discrete salinity threshold (ca. 5%) for microbial community assembly drivers. Above 5% salinity a strong environmental filtering prevailed as an assembly force, whereas a combination of biotic and abiotic factors dominated at lower salinities. This method provides a conceptual approach to identify consistent environmental thresholds in community assembly and enables quantitative predictions for the ecological impact of environmental changes.

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Acknowledgements

This work was funded by the Spanish "Ministerio de Economía y Competitividad" under the projects BRIDGES (CGL2015-69043-P, to EOC and DA), and the Ramón y Cajal Fellowship program (DA). Both VJO and MM-S have been supported by Ph.D. contracts funded by the Spanish "Ministerio de Economía y Competitividad" under the projects BRIDGES and SITES (CGL2015-69043-P, CGL2012-39964 to EOC and DA). We thank Joan Cáliz and Gerard Funosas for help in bioinformatic analyses and fruitful discussions and the facilities and warm and creative atmosphere provided by the "white room" in the Computational Biology Lab (CBL) of the Center for Advanced Studies of Blanes.

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Author notes

  1. These authors contributed equally: Xavier Triadó-Margarit, José A. Capitán

Affiliations

  1. Integrative Freshwater Ecology Group Centre for Advanced Studies of Blanes (CEAB-CSIC), Spanish Council for Scientific Research, Accés Cala St. Francesc 14, E-17300, Blanes, Spain

    Xavier Triadó-Margarit, Mateu Menéndez-Serra, Rüdiger Ortiz-Álvarez & Emilio O. Casamayor

  2. Departamento de Matemática Aplicada, Universidad Politécnica de Madrid, Av. Juan de Herrera, 6, E-28040, Madrid, Spain

    José A. Capitán

  3. Theoretical and Computational Ecology, Centre for Advanced Studies of Blanes (CEAB-CSIC), Spanish Council for Scientific Research, Accés Cala St. Francesc 14, E-17300, Blanes, Spain

    José A. Capitán, Mateu Menéndez-Serra, Vicente J. Ontiveros & David Alonso

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  1. Xavier Triadó-Margarit
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  2. José A. Capitán
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Contributions

EOC, JAC, and DA conceived the study. EOC and XT-M carried out the sampling and field work. JAC, VJO and DA designed the null models. RO-A, MM-S, and XT-M conducted bioinformatic analyses. MM-S, VJO, JAC, and XT-M contributed with scripts and analyses. JAC and XT-M led the analyses of the data. XT-M, JAC, and MM-S assembled and organized the supplementary materials. XT-M, JAC, and DA led the writing of the manuscript. All authors contributed to developing the concepts along several “Bridges” workshops, discussed and contributed critically to the drafts and gave final approval for publication.

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Correspondence to Emilio O. Casamayor or David Alonso.

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Triadó-Margarit, X., Capitán, J.A., Menéndez-Serra, M. et al. A Randomized Trait Community Clustering approach to unveil consistent environmental thresholds in community assembly. ISME J 13, 2681–2689 (2019). https://doi.org/10.1038/s41396-019-0454-4

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