Les co-occurrence au sein des communautés de diatomées révèlent moins de ségrégation que prédit par un modèle de niche

Bottin, M.; Soininen, J.; Alard, D.; Tison-Rosebery, Juliette

Diatom Cooccurrence Shows Less Segregation than Predicted from Niche Modeling | Les co-occurrence au sein des communautés de diatomées révèlent moins de ségrégation que prédit par un modèle de niche

2016

Bottin, M. | Soininen, J. | Alard, D. | Tison-Rosebery, Juliette

Species co-occurrence patterns give significant insights into the processes shaping communities. While biotic interactions have been widely studied using co-occurrence analyses in animals and larger plants, studies about co-occurrences among micro-organisms are quite rare. We examined stream diatom co-occurrences and nestedness in France, and tested the significance of the patterns with a set of random and environmentally constrained null models. Real communities showed a higher segregation than the most conservative random null models, but a general aggregation of co-occurrences when compared to environmentally constrained null models. We did not find any evidence of limiting similarity between co-occurring species. Aggregations of species co-occurrences were associated with the high levels of nestedness. Altogether, these results suggested that biotic interactions were not structuring co-occurrences of diatom species at our study scale. Instead, the patterns were more likely to be related with colonization patterns, mass-effect, and local dynamics of diatom biofilms. We further highlight that the association of random and environmentally constrained null models may give realistic insights into the co-occurrence patterns of microbial communities data.

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