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The Effect of Intraspecific Competition on Growth, Reproduction, and Survival of the Halophyte Spergularia marina
Irwin A. Ungar
International Journal of Plant Sciences
Vol. 153, No. 3, Part 1 (Sep., 1992), pp. 421-424
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/2995683
Page Count: 4
You can always find the topics here!Topics: Plants, Population growth, Marinas, Mortality, Growing seasons, Plant density, Halophytes, Population density, Flowers, Intraspecific competition
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Field observations during the 1987 and 1988 growing seasons indicated that high mortality was occurring in natural populations of Spergularia marina (L.) Griseb. Plants grown in the laboratory at densities of 1, 10, 25, 50, and 75 per 7 cm diameter pot showed a significant density-dependent effect on survival. Leaf number and dry mass production were significantly negatively affected by increases in plant density. Both the percentage of plants flowering and the number of flowers produced per plant were also negatively affected by increases in plant density. These results indicated that intraspecific competition could play a significant role in determining the growth parameters, flower production, and survival of individuals in natural populations of this species.
International Journal of Plant Sciences © 1992 The University of Chicago Press