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


ABSTRACT: The rise of Neogene C4 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.

SUBMITTER: Kergoat GJ 

PROVIDER: S-EPMC6269479 | biostudies-other | 2018 Nov

REPOSITORIES: biostudies-other

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

Kergoat Gael J GJ   Condamine Fabien L FL   Toussaint Emmanuel F A EFA   Capdevielle-Dulac Claire C   Clamens Anne-Laure AL   Barbut Jérôme J   Goldstein Paul Z PZ   Le Ru Bruno B  

Nature communications 20181130 1


The rise of Neogene C<sub>4</sub> 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 evoluti  ...[more]

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