Abstract
Biodiversity and ecosystem functioning (BEF) research advocates that biodiversity loss has a drastic alteration on ecosystem functioning. However, studies have barely investigated how the evolutionary dependence of species traits affects EF. Here, we developed an integrated approach combining functional (FD) and phylogenetic diversity (PD) into a single space to disentangle the effects of diversity on leaf decomposition. We conducted an experiment manipulating plant leaves into litterbags containing four species (from a pool of 27) combined in four different treatments represented by low or high FD and PD; these treatments present different scenarios of trait evolution and, therefore, a treatment with high FD and low PD, for instance, mimics a community assembled by divergent trait evolution of close relatives. We found that leaf decomposition was 30% slower in pools with high FD and PD. We show species pool with higher FD and PD have non-additive effects on decomposition, which means there is a negative effect of mixtures combining species with great functional and evolutionary differences. In addition, interactive effects of PD and FD were more important to leaf decomposition than their isolated effects. Our results suggest that PD and FD have interactive effects on decomposition and represent different axes of ecosystem variation, indicating we should avoid using phylogenies as a proxy for functional diversity. We argue that future BEF experiments may alter their design by considering a multifaceted scenario investigating community effects on ecosystem functioning, and idiosyncratic effects of key traits which may determine community assembly and ecosystem processes.
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Acknowledgements
We would like to thank Msc. Manuela Bandeira for plant species and abundance data; Dr. Nathan Kraft (UCLA) for essential assistance in several stages of this research; Drs. André Dias (UERJ) and Antoine Tardif (Université de Sherbrooke) for advice and discussion about leaf sampling and storage; Drs. Jarcilene Cortez (UFPE), Inara Leal (UFPE) and Marcus Cianciaruso (UFG) for experimental design insights; Dr. Gustavo Souza (UFPE) for assistance in molecular phylogeny; Dr. Caroline Biondi (UFRPE) for assistance in leaf chemical analysis; Dr. Cláudio Cristino (UFRPE) for computational assistance in combination selection; Drs. Mauro de Mello (UFRPE), Paula Omena (UNICAMP), Bráulio Santos (UFPB) and André Dias (UERJ) for manuscript proof reading and language adjustments. PHAS had scholarship by Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES), and ACBLS is financed by the Brazilian Ministry of Education (MEC) as a Tutor at the Tutorial Education Program (PET) in Ecology at Universidade Federal Rural de Pernambuco. This study was partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/MCTIC), Biodiversity Research Program, Brazilian Rainforest Network (PPBio-MA, Research Grant 457483/2012-1).
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PHAS and TG-S conceived the study with further contribution of ACB-L-S. PHAS collected data. ACB-L-S provided field and laboratorial infrastructure and TG-S performed data analysis pre- and post-experiment. PHAS wrote the first draft; other authors provided editorial advice.
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Communicated by Brian J. Wilsey.
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Sena, P.H.A., Lins-e-Silva, A.C.B. & Gonçalves-Souza, T. Integrating trait and evolutionary differences untangles how biodiversity affects ecosystem functioning. Oecologia 188, 1121–1132 (2018). https://doi.org/10.1007/s00442-018-4269-1
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DOI: https://doi.org/10.1007/s00442-018-4269-1