Open AccessThe age distribution of a Cirsium palustre population in a spring area in Jutland, Denmark
Author(s) -
Ballegaard T. K.,
Warncke E.
Publication year - 1985
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/j.1600-0587.1985.tb01153.x
Subject(s) - population , spring (device) , growing season , biology , ecology , geography , demography , mechanical engineering , sociology , engineering
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 Kate 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.