On the perspectives of populations of the rare plant species Phyteuma nigrum.

In this thesis effects of habitat characteristics and population size on the perspectives of populations of the rare perennial and self-incompatible plant species Phyteuma nigrum F.W. Schmidt (Campanuleacea) were studied. Two approaches were applied: the declining population approach and the small population approach. Phyteuma nigrum has been rare for a long time in the Netherlands. The last decades, however, the number of populations in the Netherlands, as well as the number and sizes of populations in the Drentse Aa area, where the largest Dutch population is situated, have declined. First, the possible causes of the rarity and decline of this species in this area, at the northwestern limit of the species geographic range, were investigated. The next step consisted of the assessment of the consequences of population size and (changes in) environmental conditions on population perspectives by comparing populations of different sizes for several fitness components. ....

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