CNRS researcher

Email: sonia.kefi (at) umontpellier.fr

Office phone: +33 4 67 14 40 81

I am a researcher at the CNRS based in the BioDICée team at the Institut des Sciences de l’Evolution de Montpellier (ISEM), France.

In an era of global change, my research aims at understanding how ecosystems persist and change under pressures from changing climate and land use. What makes ecosystems resilient to changes and what makes them fragile?

I combine mathematical modeling and data analysis to investigate the role of ecological interactions (in particular facilitation) in stabilizing and destabilizing ecosystems, but also to develop indicators of resilience that could warn us of approaching ecosystem shifts.

Research

In ecological communities, interactions between species form complex networks that mediate their response to perturbations. So far, ecological network studies have typically focused on one (or a few) interaction types at a time, but data and models of webs including different interaction types simultaneously have recently become available. How and when does the diversity of interactions matter for the dynamics and resilience of ecological systems? My recent research aims at analyzing ecological networks including different types of interactions. Moving beyond unidimensional analyses of ecological networks may contribute to improving our understanding and predictive capacity of the way ecological systems respond to disturbances.

Play with the Chilean web multiplex clusters (by V. Miele)

Learn more about the ANR project ECONET (2019-2022)

Some publications:
Miele et al. 2019. PLoS Computational Biology.
Pilosof, S. et al. 2017. Nature in Ecology and Evolution.
Kéfi, S., V. Miele et al. 2016. PLOS Biology.
Kéfi, S. et al. 2015. Ecology.
Kéfi, S. et al. 2012. Ecology Letters.

With the current global change, it is becoming increasingly important for us to be able to anticipate shifts in ecological communities. Shifts are often responsible for large, long-lasting changes and can result in dramatic ecological and economic consequences. Are there early warning signs that an ecosystem is loosing resilience?

Generic indicators, that can be quantified on the temporal and spatial dynamics of ecosystems, have been identified in the literature. In addition, for terrestrial ecosystems, it has been hypothesized that vegetation patchiness could be used as a signature of imminent transitions in ecosystems. Using both field data and modelling approaches, I investigate when and where these indicators can be quantified and when their predictions in terms of ecosystem degradation are reliable, with a current focus on arid ecosystems.

Arid and semi-arid ecosystems, which cover about 40% of the Earth’s terrestrial surface, are expected to be among the ecosystems most sensitive to environmental changes. There are growing concerns that climatic changes may lead to increased desertification, impacting approximately 25% of the world’s population. I am developing models of the vegetation dynamics in arid ecosystems aiming at better understanding the functioning of arid ecosystems and their response to changes in external conditions, such as grazing pressure or climate change.

Learn more about the European project CASCADE (2011-2017)

R-package on spatial early warning signals (by A. Génin)

See here for general information about early warning signals (with V. Dakos)

Some publications:
Génin, A. et al. 2020Biological Conservation
Génin, A. et al. 2018. Methods in Ecology and Evolution
Kéfi, S. and P. Couteron. 2018. Ecological indicators.
Berdugo, M. et al. 2017. Nature in Ecology and Evolution.
Schneider, F.D. and S. Kéfi. 2016. Theoretical Ecology.
Kéfi, S. et al. 2014. PLoS ONE.
Kéfi, S. et al. 2013. Oikos.
Kéfi, S. et al. 2011. Ecology Letters.
Kéfi, S. et al. 2007. Theoretical Population Biology.
Kéfi, S. et al. 2007. Nature.

In harsh environments, individuals can modify their habitat and make it more hospitable for themselves and/or others by relieving the environmental stress. Although evidence on the importance of such positive interactions is accumulating in a wide range of ecosystems, they are largely ignored by current models in ecology. Including positive interactions into ecological theory may be key to understanding population and community processes in physically stressful habitats. Studies already showed that positive interactions in the form of habitat amelioration can have profound effects on the spatial distribution of organisms, on their abundance, and on ecosystem resilience. I am interested in the role of positive interactions for the functioning of ecological communities.

Furthermore, despite their potential importance for community resilience, little is known about the role of positive interactions embedded in complex networks in stabilizing or destabilizing communities. The aim of a current project is to study the functional role of positive interactions in ecological networks. How do positive interactions affect the functioning of ecological communities, as well as the response of these communities to changing external conditions ?

Some publications:
Danet, A. et al. 2020. Theoretical Ecology
Danet, A. et al. 2018. Journal of vegetation science.
Zélé, F. et al. 2018. Nature communications.
Danet, A. et al. 2017. Ecology and Evolution.
Kéfi, S. et al. 2016. Functional Ecology.
Kéfi, S. et al. 2007. Theoretical Population Biology.

Current post-docs and Ph.D.s

Selected publications

Pilosof, S., Porter M.A., Pascual M., Kéfi S. 2017. The multilayer nature of ecological networks. Nature in Ecology and Evolution. 1: 0101.

Kéfi*, S., V. Miele*, E.A. Wieters, S.A. Navarrete, E.L. Berlow. 2016. How structured is the entangled bank? The surprisingly simple organization of multiplex ecological networks leads to increased persistence and resilience. PLOS Biology. DOI:10.1371/journal.pbio.100252 *These authors contributed equally to the study

Kéfi, S., E. Berlow, E. Wieters, S. Navarrete, O. Petchey, S. Wood, A. Boit, L. Joppa, K. Lafferty, R. Williams, N. Martinez, B. Menge, C. Blanchette, A. Iles, U. Brose. 2012. More than a meal… Integrating non-feeding interactions into food webs. Ecology Letters. 15(4): 291-300.

Kéfi, S., V. Guttal, W.A. Brock, S.R. Carpenter, A.M. Ellison, V. Livina, D.A. Seekell, M. Scheffer, E.H. van Nes, V. Dakos. 2014. Early Warning signals of ecological transitions: Methods for spatial patterns. PLoS ONE. 9(3): 2097.

Kéfi, S., M. Rietkerk, M. van Baalen, M. Loreau. 2007. Local facilitation, bistability and transitions in arid ecosystems. Theoretical Population Biology. 71(3): 267-400.

Kéfi, S., M. Rietkerk, C. L. Alados, Y. Pueyo, A. ElAich, V. Papanastasis, P. C. de Ruiter. 2007. Spatial vegetation patterns and imminent desertification in Mediterranean arid ecosystems. Nature. 449(7159):213-217.  Access the recommendation on F1000

All publications

Génin, A., T. Dutoit, A. Danet, A. le Priol, S. Kéfi.
Grazing and the vanishing complexity of plant association networks in grasslands.
Oikos. 130(4): 541-552.

Blog post on this paper

Danet, A., F.D. Schneider, F. Anthelme, S. Kéfi.
Indirect facilitation drives species composition and stability in drylands.
Theoretical Ecology. 14:189-203. https://doi.org/10.1007/s12080-020-00489-0

Thompson, P.L., S. Kéfi, Y.R. Zelnik, L.E. Dee, S. Wang, C. de Mazancourt, M. Loreau, A. Gonzalez.
Scaling up biodiversity–ecosystem functioning relationships: the role of environmental heterogeneity in space and time.
Proceedings of the Royal Society B. 288(1946). https://doi.org/10.1098/rspb.2020.2779. BioRxiv.

Maestre, F., B. Benito, M. Berdugo, L. Concostrina-Zubiri, M. Delgado-Baquerizo, D. Eldridge, E. Guirado, N. Gross, S. Kéfi, Y. Le Bagousse-Pinguet,  R. Ochoa Hueso, S. Soliveres.
Biogeography of global drylands.
New Phytologist. 231(2): 540-558. doi:10.1111/nph.17395.

Battiston, F., E. Amico, A. Barrat, G. Bianconi, G. Ferraz de Arruda, B. Franceschiello, I. Iacopini, S. Kéfi, V. Latora, Y. Moreno, M. M. Murray, T. P. Peixoto, F. Vaccarino, G. Petri. 2021.
Higher-order interactions in complex networks: an opportunity for new physics.
Nature Physics. 17:1093.

Génin, A., S. Lee, E.L. Berlow, S. Ostoja, S. Kéfi.
Mapping hotspots of potential ecosystem fragility using commonly available spatial data.
Biological Conservation. 241: 108388.

Kéfi, S.
Ecological Networks: from structure to dynamics.
Chapter 10 in: Theoretical ecology: Concepts and applications. Oxford University Press.

Houngnandan, F., S. Kéfi, J. Deter.
Identifying key-conservation areas for Posidonia oceanica seagrass beds.
Biological Conservation. 246: 108546.

Gonzalez, A., R.M. Germain, D.S. Srivastava, E. Filotas, L.E. Dee, D. Gravel, M.I. O’Connor, P.L. Thompson, J. Cowles, F. Isbell, S. Wang, S. Kéfi, J. Montoya, Y. Zelnik, M Loreau.
Scaling-up biodiversity-ecosystem functioning research.
Ecology Letters. 23(4): 757-776.

Arnoldi, J.-F., S. Coq, S. Kéfi, S. Ibanez.
Positive plant-soil feedbacks trigger tannin evolution by niche construction: a spatial stoichiometric model.Journal of Ecology. 108(1): 378-391.

Lurgi, M., N. Galiana, B. Broitman, S. Kéfi, E. Wieters, S. Navarrete.
Geographical variation of multiplex ecological networks in marine intertidal communities.
Ecology. 101(11): e03165.
Related article in the Bulletin of the ESA

van den Elsen, E., L. Stringer, C. de Ita, R. Hessel, S. Kéfi, F.D. Schneider, S. Bautista, A. Garcia Mayor, M. Baudena, M. Rietkerk, A. Valdecantos, V. Ramon Vallejo, N. Geeson, J. Brandt, L. Fleskens, L. Hemerik, P. Panagos, S. Valente, J. Jacob Keizer, G. Schwilch, M. Jucker Riva, D. Sietz, M.A. Christoforou, D.G. Hadjimitsis, C. Papoutsa, G. Quaranta, R. Salvia, I. Tsanis, I.N. Daliakopoulos, H. Claringbould, P.C. De Ruiter.
Advances in understanding and managing catastrophic shifts in Mediterranean ecosystems.
Frontiers in Ecology and Evolution. https://doi.org/10.3389/fevo.2020.561101

Drake, J.M., S.M. O’Regan, V. Dakos, S. Kéfi, P. Rohani.
Alternative stable states, tipping points, and early warning signals of ecological transitions.
Chapter 15 in: Theoretical ecology: Concepts and applications. Oxford University Press.

Dominguez-Garcia, V., V. Dakos, S. Kéfi.
Unveiling dimensions of stability in complex ecological networks.
PNAS. 116(51): 25714-25720.

CNRS news [in French] Kéfi, S., V. Dominguez-Garcia, I. Donohue, C. Fontaine, E. Thébault, V. Dakos.
Advancing our understanding of ecological stability.
Ecology Letters. 22(9): 1349-1356.

Kéfi, S.
Multiple Stable States and Catastrophic Shifts in Ecosystems.
In: Oxford Bibliographies in Ecology. Ed. David Gibson. New York: Oxford University Press. DOI: 10.1093/obo/9780199830060-0219

Miele, V., C. Guill, R. Ramos-Jiliberto, S. Kéfi.
Non-trophic interactions strengthen the diversity-functioning relationship in an ecological bioenergetic network model.
PLoS Computational Biology. 15(8): e1007269. bioRxiv.

Mayor, A.G., S. Bautista, F. Rodriguez, S. Kéfi.
Connectivity-mediated ecohydrological feedbacks and regime shifts in drylands.
Ecosystems. 22(7): 1497-1511.

Gaüzere, P., G. Doulcier, V. Devictor, S. Kéfi.
A framework for estimating species-specific contributions to community indicators.
Ecological Indicators. 99: 74-82.

Berdugo, M., F.T. Maestre, S. Kéfi, N. Gross, Y. Le Bagousse-Pinguet, S. Soliveres.
Aridity preferences alter the relative importance of abiotic and biotic drivers on plant species abundance in global drylands.
Journal of Ecology. 107(1): 190-202.

Berdugo, M., S. Soliveres, S. Kéfi, F.T. Maestre.
The interplay between facilitation and habitat type drives spatial vegetation patterns in global drylands.
Ecography. 42(4): 755-767. bioRxiv.

Rebolledo, R., S.A. Navarrete, S. Kéfi, S. Rojas, P.A. Marquet.
An Open-System Approach to Complex Biological Networks.
SIAM Journal on Applied Mathematics. 79(2): 619-640.

Hutchinson, M.C., B. Bramon Mora, S. Pilosof, A.K. Barner, S. Kéfi, E. Thébault, P. Jordano, D.B. Stouffer.
Seeing the forest for the trees: Putting multilayer networks to work for community ecology.
Functional Ecology. 3(2): 206-2017.

Brose, U., P. Archambault, A.D. Barnes, L.-F. Bersier, T. Boy, J. Canning-Clode, et al.
Predator traits determine food-web architecture across ecosystems.
Nature in Ecology and Evolution. 3: 919-927.

Kéfi, S., P. Couteron.
Spatiotemporal patterns as early warnings of possible catastrophic shifts in stressed ecological systems.
Ecological Indicators. 94(1): 491-493.

Génin, A., S. Majumder, S. Sankaran, A. Danet, V. Guttal, F.D. Schneider, S. Kéfi.
Monitoring ecosystem degradation using spatial data and the R package spatialwarnings.
Methods in Ecology and Evolution. 9(10): 2067-2075.

spatialwarnings R package
github repositoty

Danet, A., F. Anthelme, N. Gross, S. Kéfi.
Effects of indirect facilitation on functional diversity, dominance and niche differentiation in tropical alpine communities.
Journal of vegetation science. 29(5): 835-846.

Génin, A., S. Majumder, S. Sankaran, F.D. Schneider, A. Danet, M. Berdugo, V. Guttal, S. Kéfi.
Spatially heterogeneous stressors can alter the performance of indicators of regime shifts.
Ecological Indicators. 94(1): 520-533.

Zélé, F., S. Magalhães, S. Kéfi, A.B. Duncan.
Ecology and evolution of facilitation among symbionts: causes and consequences.
Nature communications. 9 (1): 4869.

Sankaran, S., S. Majumder, S.Kéfi, V. Guttal.
Implications of being discrete and spatial for detecting early warning signals of regime shifts.
Ecological Indicators. 94(1): 503-511.

Kadowaki⁠, K., S. Nishijima⁠, S. Kéfi⁠, K.O. Kameda⁠, T. Sasaki⁠.
Merging community assembly into the regime-shift approach for informing ecological restoration.
Ecological Indicators. 85: 991-998.

Maris, V., P. Huneman, A. Coreau, S. Kéfi, R. Pradel, V. Devictor.
Prediction in ecology: promises, obstacles and clarifications.
Oikos,127(2): 171-183.

CNRS news [in French]

2017

Pilosof, S., Porter M.A., Pascual M., Kéfi S. The multilayer nature of ecological networks. Nature in Ecology and Evolution. 1: 0101.
Kéfi, S., E. Thébault, A. Eklöf, M. Lurgi, A.J. Davis, M. Kondoh and J. A. Krumins. Toward multiplex ecological networks. Accounting for multiple interaction types to understand community structure and dynamics. In: Adaptive food webs: stability and transitions of real and model ecosystems. Eds: John C. Moore, Peter C. de Ruiter, Kevin S. McCann and Volkmar Wolters. Cambridge University Press.
Berdugo, M., Kéfi S., Soliveres S., Maestre F.T. Plant spatial patterns identify alternative ecosystem multifunctionality states in global drylands. Nature in Ecology and Evolution. 1: 0003.
Associated News and views by J.B. Grace.
Danet, A., S. Kéfi, R.I. Meneses, F. Anthelme. Nurse species and indirect facilitation through grazing drive plant community functional traits in tropical alpine peatlands. Ecology and Evolution. 7(24): 11265-11276.
Donohue, I., O.L. Petchey, S. Kéfi, A. Génin, A.L. Jackson, Q. Yang, N.E. O’Connor. Loss of predator species, not intermediate consumers, triggers rapid and dramatic extinction cascades. Global Change Biology. 23(8): 2962-2972.
van Belzen, J., van de Koppel J., Kirwan M.L., van der Wal D., Herman P.M.J., Dakos V., Kéfi S., Scheffer M., Guntenspergen G.R., Bouma T.J. Vegetation recovery in tidal marshes reveals critical slowing down under increased inundation. Nature Communications. 8: 15811.
van Belzen, J., van de Koppel J., van der Wal D., Herman P.M.J, Dakos V., Kéfi S., Scheffer M., Bouma T.J. Timing recovery of ecosystems in sequential remotely sensed and simulated data. Protocol Exchange. doi:10.1038/protex.2017.038.
Massol, F., M. Dubart, V. Calcagno, K. Cazelles, C. Jacquet, S. Kéfi, D. Gravel. Island Biogeography of Food Webs. Advances in Ecological Research. 56: 183–262.

2016

Kéfi*, S., V. Miele*, E.A. Wieters, S.A. Navarrete, E.L. Berlow. How structured is the entangled bank? The surprisingly simple organization of multiplex ecological networks leads to increased persistence and resilience. PLOS Biology. DOI:10.1371/journal.pbio.100252
*These authors contributed equally to the study
CNRS news [in French]
Kéfi, S., M. Holmgren, M. Scheffer. When can positive interactions cause alternative stable states in ecosystems? Functional Ecology. 30: 88-97.
Schneider, F.D., S. Kéfi. Spatially heterogeneous pressure raises risk of catastrophic shifts. Theoretical Ecology. 9(2): 207-217.  Access the recommendation on F1000
Poisot, T., D.B. Stouffer, S.Kéfi. Describe, understand and predict: why do we need networks in ecology? Functional Ecology. 30: 1878-1882.
Gounand, I., S. Kéfi, N. Mouquet, D. Gravel. Trait selection during food web assembly: the roles of interactions and temperature. Theoretical Ecology. 9(4): 417-429.
Maestre, F. T., D. J. Eldridge, S. Soliveres, S. Kéfi, M. Delgado-Baquerizo, M. A. Bowker, P. García-Palacios, J. Gaitán, A. Gallardo, R. Lázaro, M. Berdugo. Structure and Functioning of Dryland Ecosystems in a Changing World. Annual Review of Ecology, Evolution and Systematic. 47: 215-237.
Pueyo, Y., D. Moret-Fernández, A. I. Arroyo, A. de Frutos, S. Kéfi, H. Saiz, R. Charte, M. L. Giner, and C. L. Alados. Plant nurse effects rely on combined hydrological and ecological components in a semiarid ecosystem. Ecosphere. 7(10):e01514.10.1002/ecs2.1514.

2015

Kéfi, S., E.L. Berlow, E.A. Wieters, L.N. Joppa, S.A. Wood, U. Brose, S.A. Navarrete. Network structure beyond food webs: mapping non-trophic and trophic interactions on Chilean rocky shores. Ecology. 96(1): 291–303.
Poisot, T., S. Kéfi, S. Morand, M. Stanko, P. Marquet, M.E. Hochberg. A continuum of specialists and generalists in empirical communities. PLOS One. 10(5): e0114674.
Petchey, O.L., M. Pontarp, T.M. Massie, S. Kéfi, A. Ozgul, M. Weilenmann, G.M. Palamara, F. Altermatt, B. Matthews, J.M. Levine, D.Z. Childs, B.J. McGill, M.E. Schaepman, B. Schmid, P. Spaak, A.P. Beckerman, F. Pennekamp, I.S. Pearse. The ecological forecast horizon, and examples of its uses and determinants. Ecology Letters. 18(7): 587-611.
Xu, C., E.H. Van Nes, M. Holmgren, S. Kéfi, and M. Scheffer. Local facilitation may cause tipping points on a landscape level preceded by early warning indicators. American Naturalist. 186(4): E81-E90.
Xu, C., M. Holmgren, E.H. Van Nes, F.T. Maestre, S. Soliveres, M. Berdugo, S. Kéfi, P.A. Marquet, S. Abades, M. Scheffer. Can we infer plant facilitation from remote sensing? A test across global drylands. Ecological Applications. 25(6): 1456-1462.
Poisot, T., B. Baiser, J.A. Dunne, S. Kéfi, F. Massol, N. Mouquet, T.N. Romanuk, D.B. Stouffer, S.A. Wood, D. Gravel.mangal – making complex ecological network analysis simpler. Ecography. 39(4): 384-390. Website.
Mouquet, N., Y. Lagadeuc, V. Devictor, L. Doyen, A. Duputié, D. Eveillard, D. Faure, E. Garnier, O. Gimenez, P. Huneman, F. Jabot, P. Jarne, D. Joly, R. Julliard, S. Kéfi, G.J. Kergoat, S. Lavorel, L. Le Gall, L. Meslin, S. Morand, X. Morin, H. Morlon, G. Pinay, R. Pradel, F.M. Schurr, W. Thuilller, M. Loreau. Predictive ecology in a changing world. Journal of Applied Ecology. 52(5): 1293-1310.

2014

Kéfi, S., V. Guttal, W.A. Brock, S.R. Carpenter, A.M. Ellison, V. Livina, D.A. Seekell, M. Scheffer, E.H. van Nes, V. Dakos. Early Warning signals of ecological transitions: Methods for spatial patterns. PLoS ONE. 9(3): 2097.
Morlon, H., S. Kéfi, N.D. Martinez. Effects of trophic similarity on community composition. Ecology Letters. 17(2): 1495-1506.

2013

Kéfi, S., V. Dakos, M. Scheffer, E. H. Van Nes, M. Rietkerk. Early warning signals also precede non-catastrophic transitions. Oikos. 122: 641-648.
Mayor A.G., Kéfi S., Bautista S., Rodríguez F., Cartení F., Rietkerk M. Feedbacks between vegetation pattern and resource loss dramatically decrease ecosystem resilience and restoration potential in a simple dryland model. Landscape Ecology. 28: 931-942.
Komac B., S. Kéfi, P.Nuche, J.Escós, C.L. Alados. Modeling shrub encroachment in subalpine grasslands under different environmental and management scenarios. Journal of Environmental Management. 121: 160-169.
Tomimatsu, H., T. Sasaki, H. Kurokawa, J.R. Bridle, C. Fontaine, J. Kitano, D.B. Stouffer, M. Vellend, T.M. Bezemer, T. Fukami, E.A. Hadly, M.G.A. van der Heijden, M. Kawata, S. Kéfi, N.J.B. Kraft, K.S. McCann, P.J. Mumby, T. Nakashizuka, O.L. Petchey, T.N. Romanuk, K.N. Suding, G. Takimoto, J. Urabe, S. Yachi. Sustaining ecosystem functions in a changing world: a call for an integrated approach. Journal of Applied Ecology. 50: 1124–1130.

2012

Kéfi, S., E. Berlow, E. Wieters, S. Navarrete, O. Petchey, S. Wood, A. Boit, L. Joppa, K. Lafferty, R. Williams, N. Martinez, B. Menge, C. Blanchette, A. Iles, U. Brose. More than a meal… Integrating non-feeding interactions into food webs. Ecology Letters. 15(4): 291-300.
Dakos V., S.R. Carpenter, W.A. Brock, A.M. Ellison, V. Guttal, A.R. Ives, S. Kéfi, V. Livina, D.A. Seekell, E.H. van Nes, M. Scheffer. Methods for Detecting Early Warnings of Critical Transitions in Time Series Illustrated Using Simulated Ecological Data. PLoS ONE. 7(7):  e41010.
Weerman, E.J., J. Van Belzen, M. Rietkerk, S. Temmerman, S. Kéfi, P.M.J. Herman, J. Van de Koppel. Changes in diatom patch-size distribution and degradation in spatially self-organized intertidal mudflat ecosystem. Ecology. 93: 608–618.

2011

Kéfi, S., M. Rietkerk, M. Roy, A. Franc, P.C. de Ruiter & M. Pascual. Robust scaling in ecosystems and the meltdown of patch size distributions before extinction. Ecology Letters. 14: 29-35.
Dakos, V, S. Kéfi, M. Rietkerk, E. H. van Nes & M. Scheffer. Slowing down in spatially patterned ecosystems at the brink of collapse. The American Naturalist. 177(6): E153-E166.
Fontaine, C., P.R. Guimaraes, S. Kéfi, N. Loeuille, J. Memmott, W. van der Putten, F. van Veen & E. Thebault. The ecological and evolutionary implications of merging different types of networks. Ecology Letters. 14(11): 1170-1181.

2010

Kéfi, S., C.L. Alados, R.C.G. Chaves, Y. Pueyo & M. Rietkerk. Is the patch size distribution of vegetation a suitable indicator of desertification processes?: Comment. Ecology. 91(12): 3739-3742.
Kéfi, S., M. B. Eppinga, P. C. de Ruiter & M. Rietkerk. Bistability and regular spatial patterns in arid ecosystems.  Theoretical Ecology. 3(4): 257-269.
Pueyo, Y., S. Kéfi, R. Diaz-Sierra, C.L. Alados & M. Rietkerk. The role of reproductive plant traits and biotic interactions in the dynamics of semi-arid plant communities. Theoretical Population Biology. 78: 289-297.

2009CoverRestoEco09 low

Pueyo, Y., C. L. Alados, B. Garcia-Avila, S. Kéfi, M. Maestro & M. Rietkerk. Comparing direct abiotic amelioration and facilitation as tools for restoration of semi-arid grasslands. Restoration Ecology. 17(6): 908-916.

2008

Kéfi, S., M. van Baalen, M. Rietkerk & M. Loreau. Evolution of local facilitation in arid ecosystems. The American Naturalist. 172(1): E1-E17.
Kéfi, S., M. Rietkerk & G. Katul. Vegetation pattern shift as a result of rising atmospheric CO2 in arid ecosystems. Theoretical Population Biology. 74: 332-344.
Pueyo, Y., S. Kéfi, C. L. Alados & M. Rietkerk. Dispersal strategies of plants of arid ecosystems with plant-water feedbacks. Oikos. 117(10): 1522-1532.

2007

Kéfi, S., M. Rietkerk, M. van Baalen & M. Loreau. Local facilitation, bistability and transitions in arid ecosystems. Theoretical Population Biology. 71(3): 267-400.
Kéfi, S., M. Rietkerk, C. L. Alados, Y. Pueyo, A. ElAich, V. Papanastasis, P. C. de Ruiter. Spatial vegetation patterns and imminent desertification in Mediterranean arid ecosystems. Nature. 449(7159): 213-217.  Access the recommendation on F1000

Associated News and views by R. Solé.

Kéfi, S., M. Rietkerk, C. L. Alados, Y. Pueyo, A. ElAich, V. Papanastasis, P. C. de Ruiter. Investigating patchiness of spatially organized systems using field and simulated data. Nature protocols. DOI: 10.1038/nprot.2007.387.
Kéfi, S., O. Bonnet & E. Danchin. Accumulated gain in a prisoner’s dilemma: which game is performed by the players? Animal behavior. 74: e1-e6.

Others

Kéfi, S. 2020.
Chapter 10: Ecological Networks: from structure to dynamics
In: Theoretical ecology: Concepts and applications. Oxford University Press.

Drake, J.M., S.M. O’Regan, V. Dakos, S. Kéfi, P. Rohani. 2020.
Chapter 15: Alternative stable states, tipping points, and early warning signals of ecological transitions
In: Theoretical ecology: Concepts and applications. Oxford University Press.

Kéfi, S. 2019.
Multiple Stable States and Catastrophic Shifts in Ecosystems.
In: Oxford Bibliographies in Ecology. Ed. David Gibson. New York: Oxford University Press.
S. Kéfi. Feb 2019.
Catastrophic shifts in ecosystems.
Les dossier d’Agropolis international N°23 « Complex systems – from biology to landscapes« . p. 41. Expertise of the scientific communitee in the Occitanie area (France). (80 pages). Scientific coordination: Nicolas Arnaud (CNRS), Bertrand Jouve (CNRS), Jean-Pierre Müller (Cirad).
S. Kéfi, C. Violle. Feb 2019.
Ecological community dynamics: from fundamental research to agroecosystem applications.
Les dossier d’Agropolis international N°23 « Complex systems – from biology to landscapes« . p. 42. Expertise of the scientific communitee in the Occitanie area (France). (80 pages). Scientific coordination: Nicolas Arnaud (CNRS), Bertrand Jouve (CNRS), Jean-Pierre Müller (Cirad).
S. Kéfi. Juin 2018.
Ecosystèmes et transitions catastrophiques.
Les dossiers d’Agropolis  N°23 « Systèmes complexes de la biologie aux territoires ». p. 41. Compétences de la communauté scientifique en Occitanie. (80 pages). Coordination scientifique : Nicolas Arnaud (CNRS), Bertrand Jouve (CNRS), Jean-Pierre Müller (Cirad).
S. Kéfi, C. Violle. Juin 2018.
Dynamique des communautés écologiques : de la recherche fondamentale aux applications pour les agroécosystèmes.
Les dossiers d’Agropolis  N°23 « Systèmes complexes de la biologie aux territoires ». p. 42. Compétences de la communauté scientifique en Occitanie. (80 pages). Coordination scientifique : Nicolas Arnaud (CNRS), Bertrand Jouve (CNRS), Jean-Pierre Müller (Cirad).
Kéfi, S., E. Thébault, A. Eklöf, M. Lurgi, A.J. Davis, M. Kondoh and J. A. Krumins. 2017.
Toward multiplex ecological networks. Accounting for multiple interaction types to understand community structure and dynamics.
In: Adaptive food webs: stability and transitions of real and model ecosystems. Eds: John C. Moore, Peter C. de Ruiter, Kevin S. McCann and Volkmar Wolters. Cambridge University Press.
Kéfi S. Octobre 2012.
Regards et débats sur la biodiversité, SFE, Regard n°37.

Ph.D. thesis

Kéfi, S. 2008. Reading the signs. Spatial vegetation patterns, arid ecosystems and desertification. PhD thesis. ISBN: 978 9 07 138249 9.