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Tritrophic interaction diversity in gallery forests: A biologically rich and understudied component of the Brazilian cerrado

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Abstract

Creating robust datasets of plant–insect interactions is important for understanding ecosystem dynamics, and data on species interactions can be used to evaluate conservation interventions. In the present work, we collected plant–herbivore–parasitoid data on an understudied but critical ecosystem—gallery forests in the Brazilian cerrado. We collected caterpillars on shrubs of Piper (Piperaceae) over the course of a year in seven gallery forests of varying sizes in order to compare seasonal changes in α- and β- diversity and tritrophic interaction networks as well as the role of fragment size in determining species and interaction diversity. Caterpillars were more abundant and diverse in the wet season and also increased with resource availability—the more Piper individuals present, the greater the abundance and richness of herbivores. The number of unique interactions between (i) plants and herbivores and (ii) herbivores and parasitoids did not change across seasons, but there was a high degree of turnover in the herbivore fauna between sites and seasons. Specialization was greatest in the dry-rainy season transition, when new leaves typically flush. Consistent with records of parasitism rates in the cerrado sensu stricto, parasitism in the gallery forests was greatest in the dry-rainy seasons. Forest size was not related to caterpillar richness. Overall, this work demonstrates the conservation value of gallery forests in supporting plant species that span the Amazon and the Atlantic Rainforest as well as diverse and highly seasonal trophic interactions.

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Data will be shared upon request and will be made available on Dryad (datadryad.org) upon acceptance of the manuscript.

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Acknowledgements

We thank Vanessa Morais, Neuza A. P. Silva and Priscila M. C. da Luz for field and laboratory support and Vitor Becker for help in identifying the lepidopteran species.

Funding

RSR was supported by a master’s scholarship from CAPES; LAD and EJT were supported by NSF grant DEB-1442103 and DEB-1442075, respectively. IRD received financial support from CNPq and FAPDF, and CL was supported by a post-doctoral scholarship from CNPq.

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Contributions

RSR designed the study, collected data, identified Lepidoptera, and helped write the manuscript; LAD designed the study, analyzed data, and wrote and edited the manuscript; CL collected data, identified Lepidoptera and edited the manuscript; TPS, PAR, and TBT collected data; IRD designed the study, identified Lepidoptera, and edited the manuscript; ARN identified parasitoids; DMS analyzed data and helped write and edit the manuscript; EJP identified Piper and edited the manuscript; TJM analyzed data and wrote and edited the manuscript.

Corresponding author

Correspondence to Tara Joy Massad.

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Handling Editors: Miriama Malcicka and Heikki Hokkanen.

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Rabelo, R.S., Dyer, L.A., Lepesqueur, C. et al. Tritrophic interaction diversity in gallery forests: A biologically rich and understudied component of the Brazilian cerrado. Arthropod-Plant Interactions 15, 773–785 (2021). https://doi.org/10.1007/s11829-021-09856-y

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  • DOI: https://doi.org/10.1007/s11829-021-09856-y

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