Abstract
The turnover of community composition across space, β-diversity, is influenced by different assembly mechanisms, which place varying weight on local habitat factors, such as environmental conditions and species interactions, and regional factors such as dispersal and history. Several assembly mechanisms may function simultaneously; however, little is known about how their importance changes over time and why. Here, we implemented a field survey where we sampled a bacterial metacommunity consisting of 17 rock pools located at the Swedish Baltic Sea coast at 11 occasions during 1 year. We determined to which extent communities were structured by different assembly mechanisms using variation partitioning and studied changes in β-diversity across environmental gradients over time. β-Diversity was highest at times of high overall productivity and environmental heterogeneity in the metacommunity, at least partly due to species sorting, that is, selection of taxa by the prevailing environmental conditions. In contrast, dispersal-driven assembly mechanisms were primarily detected at times when β-diversity was relatively low. There were no indications for strong and persistent differences in community composition or β-diversity between permanent and temporary pools, indicating that the physical disturbance regime is of relatively minor importance. In summary, our study clearly suggests that there are temporal differences in the relative importance of different assembly mechanisms related to abiotic factors and shows that the temporal variability of those factors is important for a more complete understanding of bacterial metacommunity dynamics.
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Acknowledgements
We thank Xin-Mei Feng, Johan Olofsson and Jennie Zie for help during fieldwork and analyses of samples, and Eva Lindström and three anonymous reviewers for comments on the manuscript. This work was financed by the Swedish Research Council Formas and a Marie Curie Reintegration grant to SL.
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Langenheder, S., Berga, M., Östman, Ö. et al. Temporal variation of β-diversity and assembly mechanisms in a bacterial metacommunity. ISME J 6, 1107–1114 (2012). https://doi.org/10.1038/ismej.2011.177
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DOI: https://doi.org/10.1038/ismej.2011.177
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