Université de Fribourg

Status of the endangered ivory gull, Pagophila eburnea, in Greenland

Gilg, Olivier ; Boertmann, David ; Merkel, Flemming ; Aebischer, Adrian ; Sabard, Brigitte

In: Polar Biology, 2009, vol. 32, no. 9, p. 1275-1286

The ivory gull, a rare high-Arctic species whose main habitat throughout the year is sea ice, is currently listed in Greenland as ‘Vulnerable’, and as ‘Endangered’ in Canada, where the population declined by 80% in 20 years. Despite this great concern, the status of the species in Greenland has been largely unknown as it breeds in remote areas and in colonies for which population data has...

Université de Fribourg

Habitat differentiation in the threatened aquatic plant genus Baldellia (L.) Parl. (Alismataceae): Implications for conservation

Kozlowski, Gregor ; Matthies, Diethart

In: Aquatic Botany, 2009, vol. 90, no. 2, p. 110-118

A comparative analysis of the habitats of Baldellia ranunculoides (subsp. ranunculoides and subsp. repens) and Baldellia alpestris (Alismataceae) was carried out across central and western Europe. Soil samples from 43 populations were analyzed and the composition of accompanying vegetation was analyzed by canonical correspondence and indicator species analysis....