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Small rainfall changes drive substantial changes in plant coexistence

Abstract

Although precipitation patterns have long been known to shape plant distributions1, the effect of changing climate on the interactions of species and therefore community composition is far less understood2,3. Here, we explored how changes in precipitation alter competitive dynamics via direct effects on individual species, as well as by the changing strength of competitive interactions between species, using an annual grassland community in California. We grew plants under ambient and reduced precipitation in the field to parameterize a competition model4 with which we quantified the stabilizing niche and fitness differences that determine species coexistence in each rainfall regime. We show that reduced precipitation had little direct effect on species grown alone, but it qualitatively shifted predicted competitive outcomes for 10 of 15 species pairs. In addition, species pairs that were functionally more similar were less likely to experience altered outcomes, indicating that functionally diverse communities may be most threatened by changing interactions. Our results highlight how important it is to account for changes to species interactions when predicting species and community response to global change.

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Fig. 1: Effects of water treatment on the stabilizing niche and fitness differences of competing pairs.
Fig. 2: Effects of water treatment on the fecundity of species when grown without competitors.
Fig. 3: Effect of water treatment on components of the invasion growth rates of species.
Fig. 4: Effect of differences in functional traits on pairwise competition outcomes within and between water treatments.

Data availability

Data are available on Zenodo (https://doi.org/10.5281/zenodo.7083314). Data were recorded in Microsoft Excel (v.16.63.1) and analysed in R (v.4.2.0).

Code availability

Codes are available on Zenodo (https://doi.org/10.5281/zenodo.7083314). Figures and tables were created in R (v.4.2.0).

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Acknowledgements

We acknowledge the Chumash peoples as the traditional land caretakers of the area where we planted our experiment, and the Gabrielino/Tongva peoples as the traditional land caretakers of Tovaangar (the Los Angeles basin and So. Channel Islands), where UCLA is located; G. Kandlikar, K. Hayashi and M. Vaz for helpful suggestions and stimulating discussions; A. Kleinhesselink and C. Johnson for help with analyses; H. Lindsay, M. Clarke, A. Dhaliwal, G. Kandlikar, K. Hayashi, A. Kleinhesselink, K. McCurdy, A. Hardy, L. Johnsen, M. Browne, J. Cooch, M. Cowen, S. Montague and F. Van Dyke for laboratory and field assistance. The work was funded by the La Kretz Center at Sedgwick Reserve, a UCLA Vavra fellowship and National Science Foundation grants DEB 164461 and 2022810 and 2022213.

Author information

Authors and Affiliations

Authors

Contributions

M.N.V.D. and N.J.B.K. conceived and led the project. M.N.V.D., J.M.L. and N.J.B.K. developed the methods. M.N.V.D. carried out the field experiment and collected the data. Data were analysed and visualized by M.N.V.D. The initial manuscript was written by M.N.V.D. and N.J.B.K., with substantial contributions from J.M.L.

Corresponding author

Correspondence to Mary N. Van Dyke.

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Extended data figures and tables

Extended Data Fig. 1 Effects of water treatment on each competing pairs’ stabilizing niche and fitness differences.

Each species pair shown separately with confidence intervals (+/− 1 SD) for stabilizing niche and fitness differences obtained from bootstrapping. Inside the grey shaded region indicates coexistence, outside indicates competitive exclusion.

Extended Data Fig. 2 Principal component analysis of functional traits from the focal plant community.

Principal component analysis with 23 species and eleven functional traits from previous work at the site10 (Methods). The six species from this study are filled in circles and labeled following Extended Data Table 1. The open circles represent other species in the community. See Extended Data Table 3 for trait descriptions.

Extended Data Table 1 Each species’ mean per capita seed production without competitors in the two treatments from the 0g/m2 background plots ± standard error
Extended Data Table 2 Stabilizing niche and fitness difference calculations for each species pair under two rainfall treatments
Extended Data Table 3 The eleven functional traits used to create the PCA in Extended Data Fig. 2 with their units and descriptions
Extended Data Table 4 Ω, a structural analog of stabilizing niche differences and θ, a structural analog of fitness differences35 for each species pair and their predicted competition outcome using the structural method under the two rainfall treatments
Extended Data Table 5 Ω, a structural analog of stabilizing niche differences and θ, a structural analog of fitness differences35 for each species triplet and their predicted competition outcome using the structural method under the two rainfall treatments
Extended Data Table 6 Ω, a structural analog of stabilizing niche differences and θ, a structural analog of fitness differences35 for each species quadruplet, quintuplet and sextuplet, and their predicted competition outcome using the structural method under the two rainfall treatments
Extended Data Table 7 Gravimetric water content (GWC) measured at three different times during the experiment

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Van Dyke, M.N., Levine, J.M. & Kraft, N.J.B. Small rainfall changes drive substantial changes in plant coexistence. Nature 611, 507–511 (2022). https://doi.org/10.1038/s41586-022-05391-9

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