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Reproductive Effort of Some Mosses with Different Life Strategies Growing Epiphytically in Salix Forest in the Biesbosch, the Netherlands

J. M. González-Mancebo and H. J. During
Lindbergia
Vol. 22, No. 1 (1997), pp. 36-42
Published by: Oikos Editorial Office
Stable URL: http://www.jstor.org/stable/20149937
Page Count: 7
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Abstract

Biomass of sporophytes as a proportion of total biomass per unit area ($\text{RE}_{\text{c}}$) was determined for nine epiphytes in a Dutch willow forest, three perennial pleurocarps and six shorter-lived acrocarpic species. Contrary to expectations, $\text{RE}_{\text{c}}$ did not significantly differ between the two groups. In the six acrocarpic species, proportional investment of biomass in sporophytes per sporophyte-bearing shoot ($\text{RE}_{\text{s}}$) was generally rather low in comparison to studies in other habitats. The two measures of reproductive effort, $\text{RE}_{\text{c}}$ and $\text{RE}_{\text{s}}$, yielded different results and apparently reflect different trade-offs. In some species sporophytes tend to be smaller with increasing plant size, in another species the opposite was found. This difference seems to be related to 'size at first reproduction', which is reflected to some extent in the y-intercepts of the regression lines of reproductive vs vegetative mass per shoot.

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