Abstract
Key message
Species interactions should be considered during the design of restoration plans for tropical dry forests.
Abstract
Legume trees dominate old-growth and regenerating tropical dry forests with some pioneers becoming temporarily monodominant during secondary succession. Yet, the mechanisms promoting legume coexistence in this ecosystem are poorly understood but essential to develop restoration strategies for degraded forests. We studied plant–plant interactions in the regeneration niche of an early and a late successional legume tree species, increasingly co-occurring in northwestern Mexico due to persistent climatic and anthropogenic disturbance that is altering forest dynamics. Our experiment comprised two species (Acacia cochliacantha, typical early successional and monodominant, and Lysiloma watsonii, typical late successional) × two habitats (direct light and shade) × three plant interaction treatments (control, intraspecific and interspecific). Each of the 12 experimental units contained 20 pots, totaling 240 replicates. We examined germination, seedling survival, and growth dynamics and determined seedling dry mass (total and root: shoot) at the end of the experiment. Our results suggest that legume monodominance in regenerating tropical dry forests starts early during germination and may be temporarily maintained through the interplay between interspecific facilitation and intraspecific competition. In contrast, late successional species may avoid negative heterospecific interactions by recruiting later (benefiting from neighbors’ shade) and maintaining neutral associations with conspecifics since early ontogenetic stages. Therefore, a cautious selection of early and late successional species and their spatial arrangement should be considered during the planning stage of restoration programs for tropical dry forests. Advancing our understanding of plant interactions in tropical dry forests should lead us to develop better tools for restoring this highly degraded ecosystem.
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Data availability
The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We express our gratitude to Instituto de Geología UNAM (Hermosillo, Sonora) for allowing us to use their facilities during this experiment. We thank Dr. Alberto Búrquez and Dra. Enriquena Bustamante Ortega for logistical and technical support. We appreciate the assistance of David Parra, Michel Gómez, Gilberto Valenzuela, Diego Ramos and Sharon Hernández during plant measurements and harvesting.
Funding
This research was funded by PAPIIT-DGAPA, UNAM (#IN207315) to AMY, and CB-CONACYT (RETROSECE project #36971) and PROFAPI-ITSON (2024–009) to JCAY.
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E.L., R.E.F.B., and J.C.A.Y. conceived and design the experiment. E.L., R.E.F.B., and R.V. analyzed the data. R.V., A.B., B.L.B., and J.C.A.Y. wrote the initial draft of the manuscript. A.M.Y. and J.C.A.Y. obtained financial support. All authors contributed to data collection and provided editorial advice.
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Villegas, R., Larios, E., Félix-Burruel, R.E. et al. Applying plant–plant interaction theory to advance tropical dry forest restoration. Trees 38, 1023–1033 (2024). https://doi.org/10.1007/s00468-024-02532-7
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DOI: https://doi.org/10.1007/s00468-024-02532-7