Seasonal change mediates the shift between resource and
pollen limitation in Hedysarum scoparium (Fabaceae) |
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| Authors: | ChengChen Pan Qi Feng HaLin Zhao XueYong Zhao LinDe Liu JiLiang Liu Li Zhang and Jin Li |
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| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,
Gansu 730000, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,
Gansu 730000, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,
Gansu 730000, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,
Gansu 730000, China;School of Life Sciences, Ludong University, Yantai, Shandong 264025, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,
Gansu 730000, China;School of Life Sciences, Ludong University, Yantai, Shandong 264025, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,
Gansu 730000, China |
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| Abstract: | Theory suggests that with sufficient environmental variation, pollen limitation might be observed at some places or times,
and resource limitation at others, but there are no empirical data about the effect of seasonal change on the variation of
pollen limitation and resource limitation within a flowering season. In this study, we examined pollen and resource limitation
by comparing fruit set and seed production in natural- and hand-pollinated Hedysarum scoparium flowers in the
middle reaches of the Hexi Corridor region, China, in 2010. We also described a role for the first substantial autumn
rainfall in mediating a shift between pollen and resource limitation in H. scoparium, but did not analyze this experimentally.
Our results indicated that H. scoparium was resource limited at peak flowering during the summer, and was pollen limited
at peak flowering during the autumn. The seasonal change (summer to autumn) mediated the shift between pollen and
resource limitations in H. scoparium. The shift timing depended on the date of the first autumn rainfall in 2010. Changes in
the first substantial rainfall in autumn may affect fruiting of H. scoparium, thus affecting population persistence of this
species and development/structure of the local ecosystem if such conditions persist. |
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| Keywords: | plant reproductive ecology fruit set seed production Hedysarum scoparium |
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