NaultGagnon1993

Référence

Nault, A. and Gagnon, D. (1993) Ramet demography of Allium tricoccum, a spring ephemeral, perennial forest herb. Journal of Ecology, 81(1):101-119.

Résumé

A dense population was studied for 5 yr in S Quebec by measuring all ramets to estimate annual mortality, recruitment, growth, sexual and asexual reproduction rates. All vital rates estimated were closely size-dependent, and differed greatly between sterile and flowering ramets. The bimodal population structure was dominated by large sterile ramets showing high survival rates and maintained through vegetative recruitment. Seedlings emerged every year, but largely failed to establish. Most flower scapes died before setting seed. Flowering in consecutive years was rare. Flowering ramets showed high rates of asexual reproduction. At the population level, reproductive patterns were clearly biennial; resource availability (critical size and reproductive cost) and the regulating effect of season length, appear to determine reproductive synchrony. Temporal variability was significant for all demographic variables, but especially for seedling emergence and reproductive behaviour. Population growth rates (?) estimated were close to the equilibrium value of 1.00. Elasticity values associated with sexual reproduction usually contributed to <1.5% of ?. Thus, germination rate had essentially no effect on population growth rate. Clonal development of already-established ramets was the most important pathway to population growth. Simulated harvesting rates of only 5-15% were sufficient to bring the population growth rates below the equilibrium value, predicting a population decline. -from Authors

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@ARTICLE { NaultGagnon1993,
    AUTHOR = { Nault, A. and Gagnon, D. },
    TITLE = { Ramet demography of Allium tricoccum, a spring ephemeral, perennial forest herb },
    JOURNAL = { Journal of Ecology },
    YEAR = { 1993 },
    VOLUME = { 81 },
    PAGES = { 101-119 },
    NUMBER = { 1 },
    NOTE = { 00220477 (ISSN) Cited By (since 1996): 51 Export Date: 25 April 2007 Source: Scopus Language of Original Document: English },
    ABSTRACT = { A dense population was studied for 5 yr in S Quebec by measuring all ramets to estimate annual mortality, recruitment, growth, sexual and asexual reproduction rates. All vital rates estimated were closely size-dependent, and differed greatly between sterile and flowering ramets. The bimodal population structure was dominated by large sterile ramets showing high survival rates and maintained through vegetative recruitment. Seedlings emerged every year, but largely failed to establish. Most flower scapes died before setting seed. Flowering in consecutive years was rare. Flowering ramets showed high rates of asexual reproduction. At the population level, reproductive patterns were clearly biennial; resource availability (critical size and reproductive cost) and the regulating effect of season length, appear to determine reproductive synchrony. Temporal variability was significant for all demographic variables, but especially for seedling emergence and reproductive behaviour. Population growth rates (?) estimated were close to the equilibrium value of 1.00. Elasticity values associated with sexual reproduction usually contributed to <1.5% of ?. Thus, germination rate had essentially no effect on population growth rate. Clonal development of already-established ramets was the most important pathway to population growth. Simulated harvesting rates of only 5-15% were sufficient to bring the population growth rates below the equilibrium value, predicting a population decline. -from Authors },
    KEYWORDS = { clonal plant demography ramet Canada, Quebec Allium tricoccum },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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