Global evidence of positive biodiversity effects on spatial ecosystem stability in natural grasslands

Yongfan Wang (1) , Marc W Cadotte (2, 3) , Yuxin Chen (1) , Lauchlan H Fraser (4) , Yuhua Zhang (1, 5) , Fengmin Huang (1) , Shan Luo (1) , Nayun Shi (1) , Michel Loreau (6)

1 SYSU - Sun Yat-sen University [Guangzhou]
2 University of Toronto at Scarborough
3 EEB - Department of Ecology and Evolutionary Biology [University of Toronto]
4 TRU - Thompson Rivers University
5 GDUE - Guangdong University of Education
6 SETE - Station d'écologie théorique et expérimentale

The effect of biodiversity on primary productivity has been a hot topic in ecology for over 20 years. Biodiversity-productivity relationships in natural ecosystems are highly variable, although positive relationships are most common. Understanding the conditions under which different relationships emerge is still a major challenge. Here, by analyzing HerbDivNet data, a global survey of natural grasslands, we show that biodiversity stabilizes rather than increases plant productivity in natural grasslands at the global scale. Our results suggest that the effect of species richness on productivity shifts from strongly positive in low-productivity communities to strongly negative in high-productivity communities. Thus, plant richness maintains community productivity at intermediate levels. As a result, it stabilizes plant productivity against environmental heterogeneity across space. Unifying biodiversity-productivity and biodiversity-spatial stability relationships at the global scale provides a new perspective on the functioning of natural ecosystems.

Mots clés: Biodiversity; Grassland ecology

Domaines: Biodiversité et Ecologie; Ecosystèmes

Yongfan Wang, Marc W Cadotte, Yuxin Chen, Lauchlan H Fraser, Yuhua Zhang, et al.. Global evidence of positive biodiversity effects on spatial ecosystem stability in natural grasslands. Nature Communications, 2019, 10, pp.3207. ⟨10.1038/s41467-019-11191-z⟩. ⟨hal-02350636⟩