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Revisiting the role of mean annual precipitation in shaping functional trait distributions at a continental scale

I. Towers,P. Vesk,E. Wenk,R. Gallagher,Saras M. Windecker,Ian J. Wright,D. Falster

Published 2023 in bioRxiv

ABSTRACT

Mean annual precipitation (MAP) plays an undisputed role in determining the spatial distribution of the vegetative ecosystems on Earth. Nevertheless, the relationship between MAP and plant functional traits remains unclear. Here, we test the relationship between eight key functional traits and MAP. Our analysis reveals a strong, coordinated response of several plant traits including leaf mass per area, leaf nitrogen, the leaf carbon isotope ratio and plant height from resource-conservative to resource-acquisitive values as MAP increased. These results establish an important role for MAP in driving trait selection across space and, therefore, a need for these effects to be included in future theoretical frameworks.

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