Plant physical defenses contribute to a latitudinal gradient in resistance to insect herbivory within a widespread perennial grass.

Abstract excerpt

PREMISE: Herbivore pressure can vary across the range of a species, resulting in different defensive strategies. If herbivory is greater at lower latitudes, plants may be better defended there, potentially driving a latitudinal gradient in defense. However, relationships that manifest across the entire range of a species may be confounded by differences within genetic subpopulations, which may obscure the drivers...

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