Abstract
Among defenses against predation, chemical defenses are possibly the most studied. However, when addressing the effectiveness of those chemical defenses, previous studies did not include properties of the chemical substances themselves. Lipophilicity, for instance, may facilitate crossing membranes, and boiling point may define the duration of the substances in the air. Moreover, other variables may also be relevant: the predator taxon; the prey model chosen to conduct experiments; whether the prey is presented grouped or not in experiments; and whether the chemical defense is a mixture of many substances or only one. To understand how those factors influence chemical defenses’ effectiveness, we conducted a multilevel meta-analysis with 43 studies (127 effect sizes), accounting for different types of dependence. We used Akaike Information Criterion (AICc) to select the best model. The model with the lowest AICc value included only the boiling point, which defines how quickly a chemical substance volatilizes. This model indicated that the most effective chemical defenses had lower boiling point values, i.e., higher volatility. Moreover, we did not find chemicals with very low boiling points, suggesting there might be an optimum range of volatility. Other models, including the intercept-only model, were also recovered among the best models, therefore further studies are needed to confirm the relationship between volatility and chemical defenses’ effectiveness. Our results highlight the value of incorporating physicochemical properties in the ecological and evolutionary study of chemical defense.
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All data generated or analyzed during this study are included in its supplementary information files, and in the OSF platform: https://osf.io/v7u8q/.
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Acknowledgements
We are grateful to Vítor Marques that kindly contributed to the figures’ design, Renato Chaves de Macedo Rego, Pedro Gnaspini and Daniel Pessoa for their comments on an early draft of this paper.
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This work was supported by Coordenação de Aperfeicoamento de Pessoal de Nível Superior 88887.364513/2019-00; and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) 2021/02098-4 scholarships awarded to NGX; and by the Animal Behavior Society (ABS) Latin American Travel Award, which allowed NGX to present these results in the ABS in-person meeting. This study also benefited from FAPESP 2020/05158-5 and Conselho Nacional de Desenvolvimento Científico e Tecnológico 302879/2016-1 to RHW.
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All authors contributed to the study conception and design. Material preparation, and data collection were conducted by NGX and VSM. Statistical analyses were performed by NGX and reviewed by FMG. The first draft of the manuscript was written by NGX. RHW and FMG commented on versions of the manuscript. All authors read and approved the final manuscript.
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Nathalia, X., Vinicius, M., Danilo Brito, R. et al. The Influence of Substance Properties on Arthropod Chemical Defenses: A Meta-Analysis. J Chem Ecol 50, 42–51 (2024). https://doi.org/10.1007/s10886-023-01457-8
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DOI: https://doi.org/10.1007/s10886-023-01457-8