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Multi-year stigmatic pollen-load sampling reveals temporal stability in interspecific pollination of flowers in a subalpine meadow

文献类型： 外文期刊

作者： Fang, Qiang 1 ; Gao, Jie 3 ; Armbruster, W. Scott 4 ; Huang, Shuang-Quan 1 ;

作者机构： 1.Cent China Normal Univ, Sch Life Sci, Inst Evolut & Ecol, CN-430079 Wuhan, Hubei, Peoples R China

2.Henan Univ Sci & Technol, Coll Agr, Luoyang, Peoples R China

3.Henan Acad Agr Sci, Inst Hort, Zhengzhou, Henan, Peoples R China

4.Univ Portsmouth, Sch Biol Sci, Portsmouth, Hants, England

5.Univ Alaska, Inst Arctic Biol, Fairbanks, AK USA

关键词： avoidance and tolerance; co-flowering species; conspecific pollen; heterospecific pollen; interspecific pollination; pollen deposition; species coexistence; temporal dynamics

期刊名称：OIKOS （ 2020影响因子：3.903； 五年影响因子：4.34 ）

ISSN： 0030-1299

年卷期： 2019 年 128 卷 12 期

页码：

收录情况： SCI

摘要： Co-flowering plants may commonly experience interspecific pollination. It remains unknown, however, whether interspecific pollination is a largely stochastic process or consistent enough over years to exert selection for traits that can reduce interspecific pollination or ameliorate its deleterious effects on reproduction. To assess the likelihood of this precondition being met, stigmatic pollen loads on 17-34 insect-pollinated plant species over three consecutive years were scored in a subalpine meadow in southwestern China. Plant species varied significantly in the amount and proportion of heterospecific pollen (HP) on stigmas. Both the number of HP species and the proportion of the pollen load that was HP for each recipient species correlated positively between years (reflected in pairwise correlations for all year-by-year combinations). Although inter-annual variation was smaller for conspecific pollen (CP) than for HP loads, species tended to experience either consistently high or consistently low HP proportions across years. We found that species with higher stigmatic HP proportions generally experienced lower proportional variation in stigmatic HP, an unexpected result if high HP loads are the result of rare stochastic events. The novel finding of between-year consistency in stigmatic loads of heterospecific pollen suggests that adaption to stigmatic loads of HP is possible, and two divergent strategies may have evolved: HP avoidance and HP tolerance. The observation of temporally consistent differences among species in levels of HP supports the idea that natural selection may be operating either to increase tolerance or to minimize arrival of heterospecific pollen on stigmas in co-flowering plants. Such adaptations may be important for the maintenance of high levels of local plant diversity in biodiversity hotspots such as our study area.

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