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Relationship between abundance and fecundity in the endangered grassland annual Euphrasia rostkoviana ssp.fennica
Stockholm University, Faculty of Science, Department of Botany. Stockholm University, Faculty of Science, Department of Botany. Växtekologi. (Boreal forest bryophyte)
Stockholm University, Faculty of Science, Department of Botany. Stockholm University, Faculty of Science, Department of Botany. Växtekologi.
2007 (English)In: Annales Botanici Fennici, ISSN 0003-3847, Vol. 44, 194-203 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Fecundity, Alle-effect, Habitat fragmentation, Semi-natural grassland
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-16986ISI: 000248237600005OAI: oai:DiVA.org:su-16986DiVA: diva2:183506
Available from: 2007-10-10 Created: 2007-10-10 Last updated: 2011-01-11Bibliographically approved

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