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The Age Distribution of a Cirsium palustre Population in a Spring Area in Jutland, Denmark

T. K. Ballegaard and E. Warncke
Holarctic Ecology
Vol. 8, No. 1 (Mar., 1985), pp. 59-62
Published by: Wiley on behalf of Nordic Society Oikos
Stable URL: http://www.jstor.org/stable/3682613
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 Age Distribution of a Cirsium palustre Population in a Spring Area in Jutland, Denmark
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Abstract

In European floras Cirsium palustre (L.) Scop. usually is classified as a biennial and monocarpic species. The value of this classification was examined in a population growing in a spring area in Jutland, Denmark. It was possible to describe five ontogenetic states, i.e. life-states, in the population, the seed state excluded. Each state normally lasted for one growing season. Therefore the flowering state was generally not reached until in the fifth growing season. Observation on mortality revealed that seedlings were exposed to an extremely high death risk. However, in the other vegetative life states the death risk was rather low and constant.

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