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Life-history differentiation in Nymphoides coreana (Menyanthaceae) populations in aquatic habitats with different disturbance regimes in Japan

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Abstract

Different disturbance regimes in aquatic habitats may bring about life-history differentiation in aquatic plants. However, there is little information on this association. Adult longevity, seed size and mass, and seed-germination characteristics were surveyed for Nymphoides coreana populations, which grow in different types of aquatic habitats, to demonstrate life-history differentiation. Seed size and seed mass were significantly greater in paddy-field populations (disturbed habitats) than in irrigation-pond populations (stable habitats). Paddy-field populations were composed of annuals, whereas irrigation-pond populations contained perennials. Seed-germination characteristics were significantly different between paddy-field and irrigation-pond populations. The moist-chilling pretreatment period needed to release innate seeds from dormancy was significantly shorter in paddy-field populations than in irrigation-pond populations. The percentage of seeds that germinated was significantly higher under anaerobic conditions, irrespective of light, and under light aerobic conditions compared to dark aerobic conditions in paddy-field populations. Conversely, in irrigation-pond populations, the percentage of seeds that germinated was highest under light anaerobic conditions. These results show that the reaction norm of seed-germination characteristics was significantly broader in annual populations than in perennial populations. The occurrence of aquatic habitats with different disturbance regimes thus contributes to the maintenance of phenotypic diversity in N. coreana populations.

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Acknowledgments

I would like to thank Dr. Yasuro Kadono, who provided the opportunity for this study to be conducted. I am also grateful to Dr. Jun Nishihiro for valuable comments on the manuscript. Part of this study was supported by the Nippon Insurance Foundation.

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Authors and Affiliations

  1. Division of Life Science, Graduate School of Science and Technology, Kobe University, Nada, Kobe, 657-8501, Japan

    Yuki Shibayama

  2. Department of Pharmacology, Medical School, Kagawa University, 1750-1 Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan

    Yuki Shibayama

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  1. Yuki Shibayama
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Correspondence to Yuki Shibayama.

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Handling Editor: Takashi Asaeda.

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Shibayama, Y. Life-history differentiation in Nymphoides coreana (Menyanthaceae) populations in aquatic habitats with different disturbance regimes in Japan. Limnology 13, 199–205 (2012). https://doi.org/10.1007/s10201-011-0368-y

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  • DOI: https://doi.org/10.1007/s10201-011-0368-y

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