Habitat filtering determines the functional niche occupancy of plant communities worldwide

Yuanzhi Li 1, 2 Bill Shipley 3 Jodi N. Price 4, 5 Vinícius de L. Dantas 6 Riin Tamme 7, 8 Mark Westoby 9 Andrew Siefert 10 Marie Schamp 11 Marko J. Spasojevic 12 Vincent Jung 13 Daniel C. Laughlin 14 Sarah J. Richardson 15 Yoann Le Bagousse-Pinguet 16, 17 Christian Schöb 18 Antonio Gazol 19 Honor C. Prentice 20 Nicolas Gross 21, 17, 22 Jake Overton 23 Marcus V. Cianciaruso 24 Frédérique Louault 25 Chiho Kamiyama 26 Tohru Nakashizuka 27 Kouki Hikosaka 27 Takehiro Sasaki 28 Masatoshi Katabuchi 29 Cédric Frenette Dussault 1 Stéphanie Gaucherand 30 Ning Chen 31 Marie Vandewalle 32 Marco Antônio Batalha 33
Abstract : How the patterns of niche occupancy vary from species-poor to species-rich communities is a fundamental question in ecology that has a central bearing on the processes that drive patterns of biodiversity. As species richness increases, habitat filtering should constrain the expansion of total niche volume, while limiting similarity should restrict the degree of niche overlap between species. Here, by explicitly incorporating intraspecific trait variability, we investigate the relationship between functional niche occupancy and species richness at the global scale. 2.We assembled 21 datasets worldwide, spanning tropical to temperate biomes and consisting of 313 plant communities representing different growth forms. We quantified three key niche occupancy components (the total functional volume, the functional overlap between species and the average functional volume per species) for each community, related each component to species richness, and compared each component to the null expectations. 3.As species richness increased, communities were more functionally diverse (an increase in total functional volume), and species overlapped more within the community (an increase in functional overlap) but did not more finely divide the functional space (no decline in average functional volume). Null model analyses provided evidence for habitat filtering (smaller total functional volume than expectation), but not for limiting similarity (larger functional overlap and larger average functional volume than expectation) as a process driving the pattern of functional niche occupancy. 4.Synthesis. Habitat filtering is a widespread process driving the pattern of functional niche occupancy across plant communities and coexisting species tend to be more functionally similar rather than more functionally specialized. Our results indicate that including intraspecific trait variability will contribute to a better understanding of the processes driving patterns of functional niche occupancy
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Yuanzhi Li, Bill Shipley, Jodi N. Price, Vinícius de L. Dantas, Riin Tamme, et al.. Habitat filtering determines the functional niche occupancy of plant communities worldwide. Journal of Ecology, Wiley, 2018, 106 (3), pp.1001-1009. ⟨10.1111/1365-2745.12802⟩. ⟨hal-01598274⟩

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