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Studies on the Population Biology of the Genus Viola: III. The Demography of Viola Blanda and Viola Pallens

Sandra J. Newell, Otto T. Solbrig and Dwight T. Kincaid
Journal of Ecology
Vol. 69, No. 3 (Nov., 1981), pp. 997-1016
DOI: 10.2307/2259650
Stable URL: http://www.jstor.org/stable/2259650
Page Count: 20
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Studies on the Population Biology of the Genus Viola: III. The Demography of Viola Blanda and Viola Pallens
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Abstract

(1) All ramets one-year or older of Viola blanda and V. pallens were enumerated at regular intervals for up to 4 yr in two New England forest sites. Each seedling was similarly enumerated, and each leaf and reproductive structure in twenty plants was marked and their fate recorded at weekly intervals. (2) Calculations were made of population flux, age distribution, survival, and life expectancy for ramets one-year or older and for seedlings. (3) At one site, fluctuation in population size was small compared with the large number of individual ramets gained and lost but at the other site the population declined and eventually disappeared. (4) On average individual ramets lived for 41/2 years. (5) The rate of seed production and the probability that a ramet will survive is a function of ramet size.

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