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Opposite macroevolutionary responses to environmental changes in grasses and insects during the Neogene grassland expansion

Article scientifique 2018 Anglais

Résumé

grasslands is one of the most drastic changes recently experienced by the biosphere. A central - and widely debated - hypothesis posits that Neogene grasslands acted as a major adaptive zone for herbivore lineages. We test this hypothesis with a novel model system, the Sesamiina stemborer moths and their associated host-grasses. Using a comparative phylogenetic framework integrating paleoenvironmental proxies we recover a negative correlation between the evolutionary trajectories of insects and plants. Our results show that paleoenvironmental changes generated opposing macroevolutionary dynamics in this insect-plant system and call into question the role of grasslands as a universal adaptive cradle. This study illustrates the importance of implementing environmental proxies in diversification analyses to disentangle the relative impacts of biotic and abiotic drivers of macroevolutionary dynamics.

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Kergoat, G., Condamine, F., Toussaint, E., Capdevielle‐Dulac, C., Clamens, A., Barbut, J., Goldstein, P., Rü, B. (2018). Opposite macroevolutionary responses to environmental changes in grasses and insects during the Neogene grassland expansion. https://doi.org/10.1038/s41467-018-07537-8

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Auteur(s)

Gaël J. Kergoat Fabien L. Condamine Emmanuel F. A. Toussaint Claire Capdevielle‐Dulac Anne‐Laure Clamens Jérôme Barbut Paul Z. Goldstein Bruno Le Rü

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