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Article in Journal

Functional diversity underlies demographic responses to environmental variation in European forests (Forthcoming/Available Online)

Ruiz-Benito P, Ratcliffe S, Jump A, Gomez-Aparicio L, Madrigal-Gonzalez J, Wirth C, Kändler G, Lehtonen A, Dahlgren J, Kattge J & Zavala MA (2016) Functional diversity underlies demographic responses to environmental variation in European forests (Forthcoming/Available Online), Global Ecology and Biogeography.


Biodiversity loss and climate-driven ecosystem modification are leading to substantial changes in forest structure and function. However, the effects of diversity on demographic responses to the environment are poorly understood. We tested the diversity hypothesis (measured through functional diversity) and the mass ratio hypothesis (measured through functional identity) in relation to tree growth, tree mortality and sapling abundance. We sought to determine whether functional diversity underlies demographic responses to environmental variation in European forests. 
Europe (Spain, Germany, Wallonia, Finland and Sweden). 
We used data from five European national forest inventories from boreal to Mediterranean biomes (c. 700,000 trees in 54,000 plots and 143 tree species) and the main forest types across Europe (i.e. from needle-leaved evergreen forests to broad-leaved deciduous forests). For each forest type, we applied maximum likelihood techniques to quantify the relative importance of stand structure, climate and diversity (i.e. functional diversity and functional identity) as determinants of growth, mortality and sapling abundance. We also tested whether demographic responses to environmental conditions (including stand density, evapotranspiration and temperature anomalies) varied with functional diversity. 
Our results suggest that functional diversity has a positive effect on sapling abundance and growth rates in forests across Europe, while no effect was observed on tree mortality. Functional identity has a strong effect on mortality and sapling abundance, with greater mortality rates in forests dominated by needle-leaved individuals and a greater abundance of saplings in forests dominated by broad-leaved individuals. Furthermore, we observed that functional diversity modified the effects of stand density on demographic responses in Mediterranean forests and the influence of evapotranspiration and temperature anomalies in forests widely distributed across Europe. 
Main conclusion 
Our results suggest that functional diversity may play a key role in forest dynamics through complementarity mechanisms, as well as by modulating demographic responses to environmental variation.

Boreal biome; climate warming; forest succession; FunDivEUROPE; growth; Mediterranean biome; mortality; plant functional traits; recruitment; temperate biome

StatusIn press
AuthorsRuiz-Benito Paloma, Ratcliffe Sophia, Jump Alistair, Gomez-Aparicio Lorena, Madrigal-Gonzalez Jaime, Wirth Christian, Kändler Gerald, Lehtonen Aleksi, Dahlgren Jonas, Kattge Jens, Zavala Miguel A
Publication date online05/09/2016
Date accepted by journal22/07/2016
ISSN 1466-822X

Global Ecology and Biogeography

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