Warming reduces tall fescue abundance but stimulates toxic alkaloid concentrations in transition zone pastures of the U.S.

Although added precipitation increased soil moisture in the +heat+precip treatment over that of the +heat alone (by 11.2% over the course of the study), especially in summer, only a marginally significant interactive treatment effect ( p = 0.0546 for heat × precip) on tall fescue abundance was identified (Table 2 ).

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