Functional Diversity as a Key to Local Adaptation to Climate Change in Oak Populations

Lizeth Melissa Naranjo Bravo Lizeth Melissa Naranjo Bravo and Hernando Rodríguez Correa

Published May 2026 in International Oaks No. 37: 79–88

Abstract

Oak trees are woody angiosperms that originated in high latitudes during the late Paleocene or early Eocene. During the Miocene glaciations, they migrated south, reaching Mexico and Colombia in the Americas. Their cultural, economic, and ecological importance has led to a close relationship with the development of humankind. In Mexico, the study of oaks increased in the 1990s, and it is in this country that they reach their greatest species diversity. At the end of 2023, a group of six taxonomists began a revision of the genus for Mexico and Central America, and found that there are 179 species of oak in Mexico, distributed in four sections: 86 in section Lobatae, 86 in section Quercus, 4 in section Protobalanus, and 3 in section Virentes. Sixty-five percent of these are endemic, distributed throughout the Mexican territory except for Quintana Roo and Yucatán, and at altitudes between 40 and 3,400 m.a.s.l. There are still many taxonomic problems to be solved in the genus Quercus, but collaborative work is required, as well as an increased awareness of the role of this generation of humans in the conservation of this precious legacy for future generations.

Keywords

Quercus, Fagaceae, taxonomy, specific richness, Mexico

References

Allen, C.D., D.D Breshears, and N.G. McDowell. 2015. On underestimation of global vulnerability to tree mortality and forest die-off from hotter drought in the Anthropocene. Ecosphere 6(8): 129. https://doi.org/10.1890/ES15-00203.1

Arnold, P.A., L.E.B. Kruuk, and A.B. Nicotra. 2019. How to analyse plant phenotypic plasticity in response to a changing climate. New Phytologist 222(3): 1235-1241. https://doi.org/10.1111/nph.15656

Barton, K.E., C. Jones, K.F. Edwards, A.B. Shiels, and T. Knight. 2020. Local adaptation constrains drought tolerance in a tropical foundation tree. Journal of Ecology 108(4): 1540-1552. https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2745.13354

Boonman, C.C.F., J.M. Serra-Diaz, S. Hoeks, W.-Y. Guo, B.J. Enquist, B. Maitner, ...and J.-C. Svenning. 2024. More than 17,000 tree species are at risk from rapid global change. Nature Communications 15(1): 166. https://doi.org/10.1038/s41467-023-44321-9

Boshier, D., L. Broadhurst, J. Cornelius, L. Gallo, J. Koskela, J. Loo, ...and B. St. Clair. 2015. Is local best? Examining the evidence for local adaptation in trees and its scale. Environmental Evidence 4(1): 20.

Brodribb, T.J., J. Powers, H. Cochard, and B. Choat. 2020. Hanging by a thread? Forests and drought. Science 368(6488): 261-266. https://doi.org/10.1126/science.aat7631

Bruijnzeel, L.A., F.N. Scatena, and L.S. Hamilton (Eds.). 2010. Tropical Montane Cloud Forests: Science for Conservation and Management. Cambridge University Press.

Bussotti, F., and M. Pollastrini. 2021. Revisiting the concept of stress in forest trees at the time of global change and issues for stress monitoring. Plant Stress 2: 100013. https://doi.org/10.1016/j.stress.2021.100013

Candido-Ribeiro, R., and S.N. Aitken. 2024. Weak local adaptation to drought in seedlings of a widespread conifer. New Phytologist 241(6): 2395-2409. https://doi.org/10.1111/nph.19543

Capblancq, T., S. Lachmuth, M.C. Fitzpatrick, and S.R. Keller. 2023. From common gardens to candidate genes: exploring local adaptation to climate in red spruce. New Phytologist 237(5): 1590-1605. https://doi.org/10.1111/nph.18465

Cavender-Bares, J. 2019. Diversification, adaptation, and community assembly of the American oaks (Quercus), a model clade for integrating ecology and evolution. New Phytologist 221(2): 669-692. https://doi.org/10.1111/nph.15450

Chen, Z., S. Li, S.Wan, and S. Liu,. 2022. Strategies of tree species to adapt to drought from leaf stomatal regulation and stem embolism resistance to root properties. Frontiers in Plant Science 13:926535. https://doi.org/10.3389/fpls.2022.926535

Choat, B., T.J. Brodribb, C.R. Brodersen, R.A. Duursma, R. López, and B.E. Medlyn. 2018. Triggers of tree mortality under drought. Nature 558(7711): 531-539. https://doi.org/10.1038/s41586-018-0240-x

de Villemereuil, P., O.E. Gaggiotti, and J. Goudet. 2022. Common garden experiments to study local adaptation need to account for population structure. Journal of Ecology 110(5): 1005-1009. https://doi.org/10.1111/1365-2745.13528

Delzon, S. 2015. New insight into leaf drought tolerance. Functional Ecology 29(10): 1247-1249. https://doi.org/10.1111/1365-2435.12500

Estravis-Barcala, M., M.G. Mattera, C. Soliani, N. Bellora, L. Opgenoorth, K. Heer, and M.V. Arana. 2020. Molecular bases of responses to abiotic stress in trees. Journal of Experimental Botany 71(13): 3765-3779. https://doi.org/10.1093/jxb/erz532

Fontes, C.G., J. Pinto-Ledezma, A.L. Jacobsen, R.B. Pratt, and J. Cavender-Bares. 2022. Adaptive variation among oaks in wood anatomical properties is shaped by climate of origin and shows limited plasticity across environments. Functional Ecology 36(2): 326-340. https://doi.org/10.1111/1365-2435.13964

García-de la Cruz, Y., J. Becerra-Zavaleta, A. Quintanar-Isaías, J.M. Ramos-Prado, and A.M. Hernández-Ramírez. 2014. La bellota de Quercus insignis Martens & Galeotti, 1843, la más grande del mundo. Cuadernos de biodiversidad 46:1-8. https://doi. org/10.14198/cdbio.2014.46.01

Garnier, E., M.-L. Navas, and K. Grigulis. 2015. A functional approach to biological diversity. In Plant Functional Diversity: Organism traits, community structure, and ecosystem properties, edited by E. Garnier, M.-L. Navas, and K. Grigulis. Oxford University Press.

Helmer, E.H., E.A. Gerson, L.S. Baggett, B.J. Bird, T.S. Ruzycki, and S.M. Voggesser. 2019. Neotropical cloud forests and páramo to contract and dry from declines in cloud immersion and frost. PLOS ONE 14(4): e0213155. https://doi.org/10.1371/journal. pone.0213155

Intergovernmental Panel on Climate Change (IPCC). 2023. Weather and Climate Extreme Events in a Changing Climate. In Climate Change 2021 – The Physical Science Basis: Working Group I Contribution to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 1513-1766). Cambridge University Press.

Kaproth, M.A., B.W. Fredericksen, A. González-Rodríguez, A.L. Hipp, and J. Cavender-Bares. 2023. Drought response strategies are coupled with leaf habit in 35 evergreen and deciduous oak (Quercus) species across a climatic gradient in the Americas. New Phytologist 239(3): 888-904. https://doi.org/10.1111/nph.19019

Kelleher, C.T. 2018. Evolution and Conservation of Trees – A Review of Salient Issues. In Annual Plant Reviews online, edited by

J.A. Roberts, pp. 355-380. John Wiley & Sons, Ltd. https://doi.org/10.1002/9781119312994.apr0621

Li, X., C.J. Blackman, J.M.R. Peters, B. Choat, P.D. Rymer, B.E. Medlyn, and D.T. Tissue. 2019. More than iso/anisohydry: Hydroscapes integrate plant water use and drought tolerance traits in 10 eucalypt species from contrasting climates. Functional Ecology 33(6): 1035-1049. https://doi.org/10.1111/1365-2435.13320

Matías, L., I.M. Pérez-Ramos, and L. Gómez-Aparicio. 2019. Are northern-edge populations of cork oak more sensitive to drought than those of the southern edge? Environmental and Experimental Botany 163: 78-85. https://doi.org/10.1016/j. envexpbot.2019.04.011

Morillas, L., M.J. Leiva, J. Gandullo, I.M. Pérez-Ramos, J. Cambrollé, and L. Matías. 2024. Consistent geographical gradient of water use efficiency evidences local adaptations to drought across the complete latitudinal distribution of Quercus suber. Plant Stress 12: 100432. https://doi.org/10.1016/j.stress.2024.100432

Naranjo-Bravo, L.M., S. Zorrilla-Azcué, A. Denvir, S. Álvarez-Clare, K. Oyama, and H. Rodríguez-Correa. 2025. Preserving an emblematic oak: Threats to the conservation of Quercus insignis (Fagaceae) due to climate change. Journal for Nature Conservation 86: 126961. https://doi.org/10.1016/j.jnc.2025.126961

Nosenko, T., H. Schroeder, I. Zimmer, F. Buegger, F. Orgel, I. Burau, ...and J.-P. Schnitzler. 2025. Patterns of Adaptation to Drought in Quercus robur Populations in Central European Temperate Forests. Global Change Biology 31(4): e70168. https://doi.org/10.1111/gcb.70168

Pérez-Harguindeguy, N., S. Díaz, E. Garnier, S. Lavorel, H. Poorter, P. Jaureguiberry, …and J.H.C. Cornelissen. 2013. New handbook for standardised measurement of plant functional traits worldwide. Australian Journal of Botany 61(3): 167-234. https://doi.org/10.1071/BT12225

Ramírez-Valiente, J.A., N.J. Deacon, J. Etterson, A. Center, J.P. Sparks, K.L. Sparks, T. Longwell, G. Pilz, and J. Cavender-Bares. 2018. Natural selection and neutral evolutionary processes contribute to genetic divergence in leaf traits across a precipitation gradient in the tropical oak Quercus oleoides. Molecular Ecology 27(9) 2176-2192. https://doi.org/10.1111/mec.14566

Savolainen, O., T. Pyhäjärvi, and T. Knürr. 2007. Gene Flow and Local Adaptation in Trees. Annual Review of Ecology, Evolution, and Systematics 38: 595-619. https://doi.org/10.1146/annurev.ecolsys.38.091206.095646

Savolainen, O., M. Lascoux, and J. Merilä. 2013. Ecological genomics of local adaptation. Nature Reviews Genetics 14(11): 807–820. https://doi.org/10.1038/nrg3522

Seleiman, M.F., N. Al-Suhaibani, N. Ali, M. Akmal, M. Alotaibi, Y. Refay, ...and M.L. Battaglia. 2021. Drought Stress Impacts on Plants and Different Approaches to Alleviate Its Adverse Effects. Plants 10(2): 259. https://doi.org/10.3390/plants10020259

Shavrukov, Y., A. Kurishbayev, S. Jatayev, V. Shvidchenko, L. Zotova, F. Koekemoer, S. de Groot, K. Soole, and P. Langridge. 2017. Early Flowering as a Drought Escape Mechanism in Plants: How Can It Aid Wheat Production? Frontiers in Plant Science 8. https://doi.org/10.3389/fpls.2017.01950

Silvestro, R., C. Mura, D. Alano Bonacini, G. de Lafontaine, P. Faubert, M. Mencuccini, and S. Rossi. 2023. Local adaptation shapes functional traits and resource allocation in black spruce. Scientific Reports 13(1): 21257. https://doi.org/10.1038/s41598-023-48530-6

Skelton, R.P., L.D.L. Anderegg, P. Papper, E. Reich, T.E. Dawson, M. Kling, ...and D.D. Ackerly. 2019. No local adaptation in leaf or stem xylem vulnerability to embolism, but consistent vulnerability segmentation in a North American oak. New Phytologist 223(3): 1296-1306. https://doi.org/10.1111/nph.15886

Solé-Medina, A., J.J. Robledo-Arnuncio, and J.A. Ramírez-Valiente. 2022. Multi-trait genetic variation in resource-use strategies and phenotypic plasticity correlates with local climate across the range of a Mediterranean oak (Quercus faginea). New Phytologist 234(2): 462-478. https://doi.org/10.1111/nph.17968

Taccoen, A., C. Piedallu, I. Seynave, A. Gégout-Petit, and J.-C. Gégout. 2022. Climate change-induced background tree mortality is exacerbated towards the warm limits of the species ranges. Annals of Forest Science 79(1): 23. https://doi.org/10.1186/s13595-022-01142-y

VanWallendael, A., D.B. Lowry, and J.A. Hamilton. 2022. One hundred years into the study of ecotypes, new advances are being made through large-scale field experiments in perennial plant systems. Current Opinion in Plant Biology 66: 102152. https://doi. org/10.1016/j.pbi.2021.102152

Violle, C., M.L. Navas, D. Vile, E. Kazakou, C. Fortunel, I. Hummel, and E. Garnier. 2007. Let the concept of trait be functional! Oikos 116(5): 882-892. https://doi.org/10.1111/j.0030-1299.2007.15559.x

Wadgymar, S.M., M.-L. DeMarche, E.B. Josephs, S.N. Sheth, and J.T. Anderson. 2022. Local Adaptation: Causal Agents of Selection and Adaptive Trait Divergence. Annual Review of Ecology, Evolution, and Systematics 53: 87-111. https://doi.org/10.1146/ annurev-ecolsys-012722-035231