Decay of similarity across tropical forest communities: integrating spatial distance with soil nutrients
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Le résumé fourni par la source
Abstract Understanding the mechanisms that drive the change of biotic assemblages over space and time is the main quest of community ecology. Assessing the relative importance of dispersal and environmental species selection in a range of organismic sizes and motilities has been a fruitful strategy. A consensus for whether spatial and environmental distances operate similarly across spatial scales and taxa, however, has yet to emerge. We used censuses of four major groups of organisms (soil bacteria, fungi, ground insects, and trees) at two observation scales (1‐m 2 sampling point vs. 2,500‐m 2 plots) in a topographically standardized sampling design replicated in two tropical rainforests with contrasting relationships between spatial distance and nutrient availability. We modeled the decay of assemblage similarity for each taxon set and site to assess the relative contributions of spatial distance and nutrient availability distance. Then, we evaluated the potentially structuring effect of tree composition over all other taxa. The similarity of nutrient content in the litter and topsoil had a stronger and more consistent selective effect than did dispersal limitation, particularly for bacteria, fungi, and trees at the plot level. Ground insects, the only group assessed with the capacity of active dispersal, had the highest species turnover and the flattest nonsignificant distance−decay relationship, suggesting that neither dispersal limitation nor nutrient availability were fundamental drivers of their community assembly at this scale of analysis. Only the fungal communities at one of our study sites were clearly coordinated with tree composition. The spatial distance at the smallest scale was more important than nutrient selection for the bacteria, fungi, and insects. The lower initial similarity and the moderate variation in composition identified by these distance‐decay models, however, suggested that the effects of stochastic sampling were important at this smaller spatial scale. Our results highlight the importance of nutrients as one of the main environmental drivers of rainforest communities irrespective of organismic or propagule size and how the overriding effect of the analytical scale influences the interpretation, leading to the perception of greater importance of dispersal limitation and ecological drift over selection associated with environmental niches at decreasing observation scales.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Decay of similarity across tropical forest communities: integrating spatial distance with soil nutrients
- Date Crossref
- 28/12/2021
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Universitat Autònoma de Barcelona pays non établi dans la noticeUniversité ou école supérieure
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Centre for Research on Ecology and Forestry Applications pays non établi dans la noticeStructure de recherche
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Global Ecology Unit CREAF-CSIC-UAB pays non établi dans la noticeStructure de recherche
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University of Antwerp Department of Biology pays non établi dans la noticeUniversité ou école supérieure
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Centre National de la Recherche Scientifique pays non établi dans la noticeOrganisme public
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Université Toulouse III - Paul Sabatier pays non établi dans la noticeUniversité ou école supérieure
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Université Fédérale de Toulouse Midi-Pyrénées pays non établi dans la noticeUniversité ou école supérieure
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Evolution et Diversité Biologique pays non établi dans la noticeStructure de recherche
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Institut de Recherche pour le Développement pays non établi dans la noticeOrganisme public
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Inserm pays non établi dans la noticeOrganisme public
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Université Paris Sciences et Lettres pays non établi dans la noticeUniversité ou école supérieure
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Institut de Biologie de l'École Normale Supérieure pays non établi dans la noticeStructure de recherche
Universitat Autònoma de Barcelona, Centre for Research on Ecology and Forestry Applications et Global Ecology Unit CREAF-CSIC-UAB, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.