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Variation in demographic and fine-scale genetic structure with population-history stage of Hemerocallis taeanensis (Liliaceae) across the landscape

  • Original Article
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Ecological Research

Abstract

Fine-scale genetic structure (FSGS) in plant populations is expected to be influenced by variation in demographic processes across space and over time. I chose Hemerocallis taeanensis (Liliaceae), a perennial herb with a rapid population turnover, to quantify how demographic structure and FSGS change with a population’s history (i.e., density). Nonaccumulative O-ring statistic and spatial autocorrelation analysis (kinship coefficient, F ij ) were used to quantify spatial patterns of individuals and FSGS in four populations belonging to two population stages (expansion and maturation) in west-central Korea. The O-ring function revealed that significant aggregation of individuals occurs at short spatial scales during the earlier stage of population expansion, which reflects restricted seed dispersal around maternal individuals. However, this pattern disappears as the population density increases during population maturation, probably due to a high population density. Significant evidence of FSGS was found in two populations at the stage of population expansion (Sp, a statistic which describes the rate of decrease of pairwise kinship with distance, was 0.018 and 0.029). The results show that most seeds fall around maternal plants when initially established colonists proliferate at suitable microhabitats. In contrast to this, much lower Sp values (−0.003 and 0.004) were estimated for two populations at the stage of population maturation, which may result from the overlapping of seed shadows due to high adult density. All of these results demonstrate considerable variation in within-population demographic and genetic structures of H. taeanensis with respect to population temporal stage across the landscape.

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Acknowledgments

The author thanks J. López-Pujol and E. Myers for making helpful suggestions, and M. G. Chung and J. D. Nason for discussion of the Sp statistic and many valuable suggestions for statistical analyses. This work was supported in part by a grant from ‘Eco-Technopia 21 Project (2004–2008), the Korean government’s R & D Program (#05002-0028-0) on environmental technology development’ through Y. Suh (Seoul National University, Republic of Korea) to M.G.C (Gyeongsang National University, Republic of Korea).

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  1. Department of Biology, Gyeongsang National University, Jinju, 660-701, Republic of Korea

    Mi Yoon Chung

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Correspondence to Mi Yoon Chung.

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Chung, M.Y. Variation in demographic and fine-scale genetic structure with population-history stage of Hemerocallis taeanensis (Liliaceae) across the landscape. Ecol Res 23, 83–90 (2008). https://doi.org/10.1007/s11284-007-0341-8

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  • DOI: https://doi.org/10.1007/s11284-007-0341-8

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