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Soil resource availability, plant defense, and herbivory along a successional gradient in a tropical dry forest

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Abstract

Tropical dry forests (TDFs) usually occur as mosaics at different stages of natural regeneration, along which variations in soil attributes (fertility and texture) can affect plant growth and leaf traits and, consequently, leaf herbivory. In the present study, we used a chronosequence approach to determine the variations in plant growth, leaf defense, and insect herbivory in different successional species groups, following the predictions of the resource availability hypothesis: plants at early successional stages would grow faster, have lower specific leaf mass (SLM), and suffer higher herbivore damage than late successional plants. For this purpose, we measured plant diameter and collected leaves at the end of the rainy season (April) during three consecutive years in three different successional stages (early, intermediate, and late). In total, we sampled 38 plant species, from which 31 species were exclusive to a single successional stage (10 early, 13 intermediate, and eight late species). Our results did not conform to the resource availability hypothesis, as plants growing in early successional stages had higher growth rates and SLM, and lower leaf damage by herbivores. Soil fertility and texture did not affect plant growth or SLM, but leaf damage was negatively affected by SLM. Apart from being a defensive trait, SLM is also involved in the conservation of water and nutrients and photoprotection, and its variation along successional gradients in TDFs conforms to a continuum from conservative traits in hot and dry, early successional stages, to acquisitive traits in more humid late stages. Although other plant defenses must be considered, our three-year study indicates that the resource availability hypothesis, which was formulated for wet forests, should be adapted to deciduous TDFs where water availability is the main environmental filter along succession.

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Acknowledgements

We are very grateful to LF Machado, HF Soares, and ACF Pereira for field assistance. We also thank the logistical support provided by the Instituto Estadual de Florestas (IEF) and the funding by Fundação de Amparo à Pesquisa de Minas Gerais (FAPEMIG), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and the Inter-American Institute for Global Change Research (IAI-CRN II-021). We gratefully acknowledge the scholarships from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) to Mário M. Espírito-Santo and Jhonathan O. Silva (Financing Code 001).

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JOS, MMES, and HSS proposed the sampling design of the study. JOS and HSS contributed to the sampling and estimates of total leaf area, herbivory, and specific leaf mass. MMES provided information of the soil data of the study plots. JOS performed the statistical analysis. JOS, HSS, PMSR, and MMES wrote the manuscript. MMES, PMSR, and PCR helped discuss the manuscript. All authors participated in the review of the manuscript.

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Correspondence to Jhonathan O. Silva.

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The authors mentioned above declare that there is no conflict of interest associated with this manuscript. The work represents an original research carried out by the authors. All authors agree with the contents of the manuscript and its submission to the journal.

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Communicated by Norris Z. Muth.

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Silva, J.O., Souza-Silva, H., Rodrigues, P.M.S. et al. Soil resource availability, plant defense, and herbivory along a successional gradient in a tropical dry forest. Plant Ecol 222, 625–637 (2021). https://doi.org/10.1007/s11258-021-01131-7

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  • DOI: https://doi.org/10.1007/s11258-021-01131-7

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