Long-term demographic variation in range-margin populations of Gypsophila fastigiata
2000 (English)In: Folia Geobotanica, ISSN 1211-9520, E-ISSN 1874-9348, Vol. 35, 143-160 p.Article in journal (Refereed) Published
Disjunct populations of the perennial herb Gypsophilafastigiata L. (Caryophyllaceae) on the Balticisland of Oland were monitored during a thirteen-year study. The main objectives were to analyze the dynamicfeatures of G. fastigiata within and among sub-populations in shorter and longer time perspectives, and torelate this to habitat characteristics and patterns in local weather variation. The total number of individualsdecreased and the proportion of reproductive individuals increased throughout the study period. Recruitmentand mortality on a fine spatial scale (0.25 m 2) were negatively correlated to species richness and vegetationcover. Rapid changes in population sizes were observed during and after summers with low precipitation. Thehighest mortality rates were found in pre-reproductive stages whereas relatively many of the aduk plantssurvived the droughts. The long-term trend of population decline in G. fastigiata could be a result of changesin vegetation structure due to changing grazing regimes. It might also be an effect of more frequent dry summersduring the second half of the observation period or of an interaction between weather and changes in management.Another interpretation is that dynamic processes are taking place on a geographic scale not covered in thepresent study.
Place, publisher, year, edition, pages
2000. Vol. 35, 143-160 p.
IdentifiersURN: urn:nbn:se:uu:diva-42115OAI: oai:DiVA.org:uu-42115DiVA: diva2:70016