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Effect of density on individual size and fertility in two species of weeds : Galinsoga ciliata Blake and Galinsoga parviflora Cav.

Dostatny D.

Polish Journal of Ecology

1999

Vol. 47, no 3

353-357

Fertility (=seed production) in Galinsoga species depends on the size of the individual. An individual produces many seeds in conditions of low density. If the population density of G. ciliata and G. parviflora increases, the production of seed by one individual decreases. In high density the size of individuals diminished. The population density of the stands in the vicinity of farms is high. Due to the high density, these stands are characterised by high seed production per square metre. The greater is the distance from the farms, the lower is the density and seed production per square metre.