Fleurot Emilie, Keurinck Léa, Boulanger Vincent, Debias François, Delpierre Nicolas, Delzon Sylvain, Lobry Jean R, Mermet-Bouvier Camille, Bel-Venner Marie-Claude, Venner Samuel
Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, Villeurbanne, France.
Department DISAFA, University of Torino (IT), Torino, Italy.
Ecol Lett. 2024 Nov;27(11):e70009. doi: 10.1111/ele.70009.
Pollen limitation has a considerable influence on forest masting, the highly variable and synchronised seed production, on which forest regeneration and ecosystem dynamics largely rely. Depending on the various mechanisms possibly involved in pollen limitation, the consequences of climate change on masting could be very different. These mechanisms were investigated in 10 oak populations along a climatic gradient using surveys of airborne pollen and fruiting rate as a proxy of pollen limitation. We found no support for the widely accepted hypothesis of the intra-annual synchrony of flower phenology when considered in isolation. Instead, the fruiting rate was largely explained by a combination of intra-annual flower phenology synchrony, annual investment in flowering and the effects of weather on pollen maturation and diffusion. These findings highlight the need for a cohesive theoretical framework for pollen limitation to accurately predict the impact of climate change on oak-dominated ecosystems.
花粉限制对森林结实有着相当大的影响，森林结实是高度可变且同步的种子生产过程，而森林更新和生态系统动态在很大程度上依赖于此。根据花粉限制可能涉及的各种机制，气候变化对结实的影响可能会大不相同。利用空气中花粉的调查和结果率作为花粉限制的指标，沿着气候梯度在10个栎树种群中对这些机制进行了研究。当单独考虑时，我们没有找到对广泛接受的花期物候年内同步假说的支持。相反，结果率在很大程度上是由年内花期物候同步、开花的年度投入以及天气对花粉成熟和扩散的影响共同作用来解释的。这些发现凸显了需要一个统一的花粉限制理论框架，以准确预测气候变化对以栎树为主的生态系统的影响。
