Differences in individual flowering time change pollen limitation and seed set in three montane wildflowers
Differences in individual flowering time change pollen limitation and seed set in three montane wildflowers
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三种山地野花个体开花时间的差异改变了花粉限制和结籽情况
DOI：
10.1002/ajb2.16123
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发表时间：
2023
影响因子：
3
通讯作者：
Brosi, Berry J.
中科院分区：
文献类型：
--
作者：
Schiffer, Annie;Loy, Xingwen;Morozumi, Connor;Brosi, Berry J.
气候变化引起的开花时间变化可能会影响植物的繁殖力，但缺乏比较不同物候、共生物种个体水平反应的研究。我们评估了不同季节开花时间的三种山地植物的花物候变化对个体繁殖力的影响，包括通过融雪加速处理来增加物候的变异性。方法收集了三种山地植物(Mertensia fusiformis，Delphdium nuttalanum，Potentilla Pulcherrima)的花物候和结实率数据。为了研究结实的驱动因素，我们测量了同种花密度，并进行了花粉限制实验，以分离授粉功能。我们在受控的大规模融雪加速实验中推进了植物群落的物候。结果个体物候相对于其他种群的不同影响了我们重点物种的繁殖力，但影响是物种特有的。对于我们的早季物种来说，在种群高峰之前开花的个体增加了繁殖力，而对于我们的中季物种来说，仅仅在种群高峰之前或之后开花就会增加个体的繁殖力。对于我们的晚季物种来说，早于种群高峰开花增加了繁殖力。早季和中季物种是花粉受限的，而同种密度只影响我们早季物种的结实率。结论我们的研究表明，个体物候期的差异影响了3个物候学上不同的山地物种的繁殖力，并且花粉限制的影响可能比同种密度更大。我们的结果表明，个体水平的物候学变化对于理解植物繁殖成功是重要的。
PremiseChanges to flowering time caused by climate change could affects plant fecundity, but studies that compare the individual‐level responses of phenologically distinct, co‐occurring species are lacking. We assessed how variation in floral phenology affects the fecundity of individuals from three montane species with different seasonal flowering times, including in snowmelt acceleration treatments to increase variability in phenology.MethodsWe collected floral phenology and seed set data for individuals of three montane plant species (Mertensia fusiformis, Delphinium nuttallianum, Potentilla pulcherrima). To examine the drivers of seed set, we measured conspecific floral density and conducted pollen limitation experiments to isolate pollination function. We advanced the phenology of plant communities in a controlled large‐scale snowmelt acceleration experiment.ResultsDifferences in individual phenology relative to the rest of the population affected fecundity in our focal species, but effects were species‐specific. For our early‐season species, individuals that bloomed later than the population peak bloom had increased fecundity, while for our midseason species, simply blooming before or after the population peak increased individual fecundity. For our late‐season species, blooming earlier than the population peak increased fecundity. The early and midseason species were pollen‐limited, and conspecific density affected seed set only for our early‐season species.ConclusionsOur study shows that variation in individual phenology affects fecundity in three phenologically distinct montane species, and that pollen limitation may be more influential than conspecific density. Our results suggest that individual‐level changes in phenology are important to consider for understanding plant reproductive success.