Publications

serosurvey for toxoplasma gondii in arctic foxes and possible sources of infection in the high arctic of svalbard.	samples (blood or tissue fluid) from 594 arctic foxes (alopex lagopus), 390 svalbard reindeer (rangifer tarandus platyrhynchus), 361 sibling voles (microtus rossiaemeridionalis), 17 walruses (odobenus rosmarus), 149 barnacle geese (branta leucopsis), 58 kittiwakes (rissa tridactyla), and 27 glaucous gulls (larus hyperboreus) from svalbard and nearby waters were assayed for antibodies against toxoplasma gondii using a direct agglutination test. the proportion of seropositive animals was 43% in ar ...	2007	17950534
aphid-willow interactions in a high arctic ecosystem: responses to raised temperature and goose disturbance.	recently, there have been several studies using open top chambers (otcs) or cloches to examine the response of arctic plant communities to artificially elevated temperatures. few, however, have investigated multitrophic systems, or the effects of both temperature and vertebrate grazing treatments on invertebrates. this study investigated trophic interactions between an herbivorous insect (sitobion calvulum, aphididae), a woody perennial host plant (salix polaris) and a selective vertebrate graze ...	2013	23749580
genetic consequences of breaking migratory traditions in barnacle geese branta leucopsis.	cultural transmission of migratory traditions enables species to deal with their environment based on experiences from earlier generations. also, it allows a more adequate and rapid response to rapidly changing environments. when individuals break with their migratory traditions, new population structures can emerge that may affect gene flow. recently, the migratory traditions of the barnacle goose branta leucopsis changed, and new populations differing in migratory distance emerged. here, we in ...	2013	24118391
indices of stress and immune function in arctic barnacle goslings (branta leucopsis) were impacted by social isolation but not a contaminated grazing environment.	in many areas around the arctic remains and spoil heaps of old mines can be found, which have been abandoned after their heydays. runoff from tailings of these abandoned mines can directly contaminate the local environment with elevated concentrations of trace metals. few studies have investigated the possible negative effects of contaminants on arctic terrestrial animals that use these areas. trace metals can accumulate in animals and this accumulation has been linked to negative effects on fit ...	2017	28550726