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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
Stable URL: http://www.jstor.org/stable/2995683
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Effect of Intraspecific Competition on Growth, Reproduction, and Survival of the Halophyte Spergularia marina
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Abstract

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.

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