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Loss of biodiversity and shifts in aboveground biomass drivers in tropical rainforests with different disturbance histories

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Abstract

Tropical forests account for more than half of the global carbon forest stock and much of the biological diversity on Earth. However, disturbances such as deforestation and forest degradation threaten the maintenance of these ecosystem services. This study aimed to understand how different disturbance histories affect the forest stand biomass, as well as species and functional diversity, and to what extent these differences can change the relationships between biomass and their drivers. We used data from forests with clear-cut and selectively logged disturbance histories, and from old-growth forests, situated in the Brazilian Atlantic forest. Forests with logging disturbances showed significant losses in their aboveground biomass compared to those of old-growth forests (50% loss in selectively logged forests and 80% loss in clear-cut forests). Interestingly, only clear-cut secondary forests showed differences in species and functional diversity, and were dominated by species with acquisitive trait values, commonly found early in succession. Shifts in stand biomass drivers were observed in selectively logged forests. The mass-ratio hypothesis (mainly through the functional trait of maximum height) was the most important biomass driver in clear-cut secondary and old-growth forests, whereas the importance of the niche complementarity hypothesis (through functional richness and dispersion) was higher in selectively logged forests. Our study highlights that disturbance histories can affect forest aboveground biomass and its drivers. Moreover, our results reinforce the need for conservation of intact forests but highlight the importance of including degraded forests in conservation mechanisms based in carbon stocks, as these forests retain high values of species and functional diversities that are crucial to biomass and consequently carbon stock acquisition.

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Acknowledgements

We thank Chong Kwek Yan and two anonymous reviewers for comments that greatly improved the article. We also thank Érica R. Borges for assistance in map creation, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Project Numbers 446698/2014-8 and 307591/2016-6) and FAPEMIG (APQ-01309-16, and PPM-00584-16) for grants. JAAMN holds a productivity fellowship of CNPq. JAPJ was funded by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and CNPq (Project Number 441225/2016-0).

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Correspondence to Marcela V. Pyles or João A. A. Meira-Neto.

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Communicated by David Hawksworth.

This article belongs to the Topical Collection: Forest and plantation biodiversity

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Pyles, M.V., Prado-Junior, J.A., Magnago, L.F.S. et al. Loss of biodiversity and shifts in aboveground biomass drivers in tropical rainforests with different disturbance histories. Biodivers Conserv 27, 3215–3231 (2018). https://doi.org/10.1007/s10531-018-1598-7

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  • DOI: https://doi.org/10.1007/s10531-018-1598-7

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