Multi-year stigmatic pollen-load sampling reveals temporal stability in interspecific pollination of flowers in a subalpine meadow
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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.
|Early online date||6 Jul 2019|
|Publication status||Early online - 6 Jul 2019|
Rights statement: This is the peer reviewed version of the following article: Fang, Q. , Gao, J. , Armbruster, W. S. and Huang, S. (2019), Multi‐year stigmatic pollen‐load sampling reveals temporal stability in interspecific pollination of flowers in a subalpine meadow. Oikos. Accepted Author Manuscript., which has been published in final form at doi: 10.1111/oik.06447. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Accepted author manuscript (Post-print), 451 KB, PDF-document
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