Are complementarity effects of species richness on productivity the strongest in species-rich communities?

0554300 - BÚ 2022 RIV GB eng J - Článek v odborném periodiku
Michalet, R. - Delerue, F. - Liancourt, Pierre - Pugnaire, F.I.
Are complementarity effects of species richness on productivity the strongest in species-rich communities?
Journal of Ecology. Roč. 109, č. 5 (2021), s. 2038-2046. ISSN 0022-0477. E-ISSN 1365-2745
Institucionální podpora: RVO:67985939
Klíčová slova: biomass * competition * diversity
Obor OECD: Ecology
Impakt faktor: 6.381, rok: 2021
Způsob publikování: Omezený přístup

How the relationship between species richness and productivity changes along environmental gradients remains poorly understood. We examined the context dependency of complementarity processes under-pinning this relationship (biotic feedbacks, resource partitioning and facilitation) using the framework of Grime's (1973) humped- back model. We considered sev-eral scenarios of variation in competition and facilitation along environmental gra-dients, either monotonic with the most common or intense facilitation at the most abiotically severe end of gradients or nonlinear with the strongest facilitation at intermediate positions along gradients. How competition shifts to facilitation along environmental gradients is a key for determining where the effect of species richness on productivity occurs. Based on the literature, the original Stress Gradient Hypothesis would likely predict that complementarity effects should be the greatest, or the most important, in the most abiotically stressful environments. Alternatively, both the ‘collapse of facili-tation’ and the ‘shift back to competition’ scenarios predict that the highest overall complementary effects on productivity, not biomass, would most likely occur at intermediate positions along environmental stress gradients, but this might vary depending on the source of stress. This latter prediction is consistent with a great deal of literature on natural gradients of productivity and species richness.
Trvalý link: http://hdl.handle.net/11104/0328934