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Selection on flowering time in Mediterranean high-mountain plants under global warming

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Abstract

Under climate warming, plants will undergo novel selective pressures to adjust reproductive timing. Adjustment between reproductive phenology and environment is expected to be higher in arctic and alpine habitats because the growing season is considerably short. As early- and late-flowering species reproduce under very different environmental conditions, selective pressures on flowering phenology and potential effects of climate change are likely to differ between them. However, there is no agreement on the magnitude of the benefits and costs of early- vs. late-flowering species under a global warming scenario. In spite of its relevance, phenotypic selection on flowering phenology has rarely been explored in alpine plants and never in Mediterranean high mountain species, where selective pressures are very different due to the summer drought imposed over the short growth season. We hypothesized that late-flowering plants in Mediterranean mountains should present stronger selective pressures towards early onset of reproduction than early-flowering species, because less water is available in the soil as growing season progresses. We performed selection analyses on flowering onset and duration in two high mountain species of contrasting phenology. Since phenotypic selection can be highly context-dependent, we studied several populations of each species for 2 years, covering their local altitudinal ranges and their different microhabitats. Surrogates of biotic selective agents, like fruitset for pollinators and flower and fruit loss for flower and seed predators, were included in the analysis. Differences between the early- and the late-flowering species were less than expected. A consistent negative correlational selection of flowering onset and duration was found affecting plant fitness, i.e., plants that bloomed earlier flowered for longer periods improving plant fitness. Nevertheless, the late-flowering species may experience higher risks under climate warming because in extremely warm and dry years the earlier season does not bring about a longer flowering duration due to summer drought.

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Acknowledgments

The authors thank the staff of Parque Natural de las Cumbres, Circo y Lagunas de Peñalara for permission to work in the area and C. F. Aragón, A. L. Luzuriaga and M. J. Albert for helping with field work. The authors also thank D. Palacios for providing the digital images for snowmelt date estimation, K. Donohue and M. de la Cruz for providing SAS and R scripts, respectively, and L. De Hond for linguistic assistance. This work was supported by projects ISLAS (CGL2009-13190-C03-01), SIL-HAD (CGL2009-08755) and LIMITES (CGL2009-07229) funded by the Ministerio de Ciencia e Innovación (Spain) and REMEDINAL2 funded by the Comunidad de Madrid.

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Correspondence to Luis Giménez-Benavides.

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Giménez-Benavides, L., García-Camacho, R., Iriondo, J.M. et al. Selection on flowering time in Mediterranean high-mountain plants under global warming. Evol Ecol 25, 777–794 (2011). https://doi.org/10.1007/s10682-010-9440-z

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