Relationship between abundance and fecundity in the endangered grassland annual Euphrasia rostkoviana ssp.fennica
2007 (English)In: Annales Botanici Fennici, ISSN 0003-3847, Vol. 44, 194-203 p.Article in journal (Refereed) Published
We examined 18 populations of the endangered Euphrasia rostkoviana ssp. fennica situated in managed semi-natural grasslands or gravelled road verges in ten extant localities in south-eastern Sweden. The major threat to the subspecies is the steady decrease in habitat area and quality. In each population, abundance and fecundity of individuals were examined. Local factors (soil-pH, litter-layer depth and vascular species richness) and isolation were also measured. We specifically wanted to examine if there was a positive relationship between abundance (population size and density) and fecundity in the investigated taxon. L
Larger populations of E. rostkoviana ssp. fennica were found to be more dense. Population size and density were both significantly positively related to fecundity. A higher variability in seed production was also detected for individuals in sparse populations. An Allee effect, i.e. a reduced fecundity in small and sparse populations, could thus be demonstrated for the subspecies.
Place, publisher, year, edition, pages
2007. Vol. 44, 194-203 p.
Fecundity, Alle-effect, Habitat fragmentation, Semi-natural grassland
IdentifiersURN: urn:nbn:se:su:diva-16986ISI: 000248237600005OAI: oai:DiVA.org:su-16986DiVA: diva2:183506