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Wings are not perfect: increased wing asymmetry in a tropical butterfly as a response to forest fragmentation

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Abstract

Habitat fragmentation and ecosystem changes have the potential to affect animal populations in different ways. To effectively monitor these changes, biomonitoring tools have been developed and applied to detect changes in population structure and/or individual traits that reflect such changes. Fluctuating asymmetry (FA) represents random deviations from perfect symmetry in bilateral traits from perfect symmetry in response to genetic and/or environmental stresses. In this study, we evaluated the use of FA as a tool to monitor stress caused by forest fragmentation and edge formation, using the tropical butterfly M. helenor (Nymphalidae) as a model species. We collected adult butterflies from three fragments of Atlantic Forest in Brazil encompassing both edge and interior habitats. Four wing traits (wing length, wing width, ocelli area, and ocelli diameter) were evaluated. Butterflies captured at edge sites exhibited higher FA values for wing length and wing width compared to those captured at interior sites, whereas traits related to ocelli did not show differences between the two habitat types. Our results suggest that the differences in abiotic and biotic conditions between forest interior and edges can act as a source of stress, impacting the symmetry of flight-related traits. On the other hand, as ocelli are crucial for butterfly camouflage and counter-predator strategies, our results indicate that this trait may be more conserved. By employing FA, we identified trait-specific responses to habitat fragmentation, thus suggesting its potential as a biomarker for environmental stress that can be used in butterflies to monitor habitat quality and change.

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The data of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to thank UFMG, ECMVS, CSEC, and UFSJ for support. We gratefully acknowledge the staff of the Instituto Estadual de Florestas (IEF – MG) and Estação Ecológica Estadual Mata do Cedro (ESEC) for allowing us to work in the Station. We want to thank Carla Daniele Guimarães for the collection of the individuals and Letícia Peroli for assistance with illustrations. TP thanks for the research scholarship from Conselho Nacional de Desenvolvimento Científico de Tecnológico (CNPq -142032/2020-4).

Funding

This study was financed in part by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG - APQ371-18), CNPq (307210/2016-2; 313007/2020-9), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/Brazil - Finance Code 001).

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Correspondence to Thaís Pignataro.

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Communicated by: Matthias Waltert

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Pignataro, T., Lourenço, G.M., Beirão, M. et al. Wings are not perfect: increased wing asymmetry in a tropical butterfly as a response to forest fragmentation. Sci Nat 110, 28 (2023). https://doi.org/10.1007/s00114-023-01856-7

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  • DOI: https://doi.org/10.1007/s00114-023-01856-7

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