Abstract
Indirect facilitation among exotic species may promote their establishment on ecosystems, causing biodiversity losses. However, few experimental studies have identified the mechanisms underlying the indirect facilitation among exotic species. In central-northern Chile, Mesembryanthemum crystallinum (Aizoaceae) is an exotic halophyte that increases soil salinity, while M. nodiflorum is another exotic halophyte –currently less dominant– that often co-occurs with M. crystallinum. In this study, we evaluated the indirect facilitation of M. nodiflorum by M. crystallinum which was mediated by the suppression of salt-susceptible native competitors via increased soil salinity. We further determined the relationship between salt-tolerance traits and the outcome of competitive interactions in saline soil. We included two native Asteraceae plants co-occurring with these Mesembryanthemum species: the –highly probable– salt-susceptible Helenium urmenetae and the salt-tolerant Amblyopappus pusillus. We combined field co-occurrence surveys with greenhouse germination and competition experiments. The Mesembryanthemum species tended to co-occur, which suggests facilitation. Further, the salinity level found under M. crystallinum significantly decreased germination and performance of H. urmenetae, but not of M. nodiflorum and A. pusillus. Accordingly, when in competition, the increased salinity counteracted the negative effect of H. urmenetae on M. nodiflorum biomass, giving M. nodiflorum a competitive advantage. These patterns were associated with decreased specific leaf area and crassulacean acid metabolism expression in M. nodiflorum. In contrast, A. pusillus and M. nodiflorum maintained a neutral interaction regardless of salinity. Overall, our results suggest that M. crystallinum, by increasing soil salinity, may reduce the performance of salt-susceptible competitors, indirectly facilitating the establishment of M. nodiflorum.
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Acknowledgements
This work was funded by FONDECYT grant 11181100 to CS-L.
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This work was funded by FONDECYT (Fondo Nacional de Desarrollo Científico y Tecnológico) grant 11181100 to CS-L.
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All authors contributed to the conception and design of the study. Material preparation, data collection and analysis were performed by HJ De La Cruz, C Salgado-Luarte and GC Stotz. The first draft of the manuscript was written by HJ De La Cruz and all authors contributed to the editing of subsequent drafts. All authors read and approved the final manuscript.
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De La Cruz, H.J., Salgado-Luarte, C., Stotz, G.C. et al. An exotic plant species indirectly facilitates a secondary exotic plant through increased soil salinity. Biol Invasions 25, 2599–2611 (2023). https://doi.org/10.1007/s10530-023-03061-z
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DOI: https://doi.org/10.1007/s10530-023-03061-z