|
|
van Bemmelen, R.S.A., Kolbeinsson, Y., Gilg, O., Alves, J.A., Smith, M., Schekkerman, H., Okill, J.D., Välimäki, K., Lehikoinen, A., Petersen, A., Thorstensen, S., Moe, B., Hanssen, S.A., González-Solís, J., van der Meer, T., Petersen, I.K., Klaassen, R.H.G., Ramos, R., Tulp, I. (2018). Contrasting migration and winter movement strategies of two distinct populations of Red-necked Phalarope breeding in the Western Palearctic. Annual International Wader Study Group conference, 28 Sept.-1 October 2018, Workum, The Netherlands.
|
|
|
|
Sokolova, N.A., Sokolov, A.A., Ehrich, D., Fufachev, I.?., Sabard, B., Gilg, O. (2018). Influence of predators on shorebirds’ breeding success during the low phase of a rodent cycle in Sabetta, high arctic Yamal (Russia), Arctic Biodiversity Congress, 9-11 October 2018, Rovaniemi, Finland. CAFF..
|
|
|
|
Gilg, O., Giroux, M.-A., Bêty, J., Lecomte, N., Schmidt, N.M. (2018).
|
|
|
|
. (2018). Bachelor's thesis, , .
|
|
|
|
Kolbeinsson, Y., Bemmelen, R.S.A.v., Gilg, O., Smith, M., Alves, J.A., Lehikoinen, A., Schekkerman, H., Ramos, R., Petersen, I.K., Þórisson, B., Sokolov, A.A., Välimäki, K., Meer, T.v.d., Okill, J.D., Bolton, M., Moe, B., Hanssen, S.A., Bollache, L., Petersen, A., Thorstensen, S., González-Solís, J., Tulp, I., Klaassen, R.H.G. (2019). Contrasting migration and wintering movement strategies of two distinct populations of Red-necked Phalarope breeding in the Western Palearctic. BOU annual conference – Tracking migration: drivers, challenges and consequences of seasonal movements, 26-28 March 2019, Warwick, UK.
|
|
|
|
Moreau, J., Bollache, L., Sittler, B., Gilg, O. (2019).
|
|
|
|
. (2019). Molar shape differentiation during range expansions of the collared lemming (Dicrostonyx torquatus) related to past climate changes (Vol. 221). Bachelor's thesis, , .
Abstract: The genus Dicrostonyx (the collared lemming) is undoubtedly the small mammal best adapted to the extreme conditions of the arctic environment. The Palearctic collared lemming has been described in numerous European Late Pleistocene localities up to south of France and Croatia. This species experienced climate-driven changes through time, changes mainly observed as repetitive pulses of pan-continental migration, and it thus became a typical indicator of glacial conditions. Using geometric morphometrics on molars, we evaluate the shape changes occurring during the last 100 ky over some dispersal events in Western Europe. The results point out that Dicrostonyx torquatus has a large intra-population variation with a homogenous morphology, regardless of the origin of the individuals. A temporal trend leading to a more complex tooth with a differentiated anterior loop on the first lower molar was observed. An additional effect of the distance from the core populations was also described with a more peculiar shape for the most western populations of France. These temporal and geographical trends might relate to the different migratory pulses documented from ancient DNA haplotypes.
Keywords: Climate Collared lemmings Geometric morphometrics Range expansion
Programme: 1036
|
|
|
|
. (2020). Are gastrointestinal parasites associated with the cyclic population dynamics of their arctic lemming hosts? (Vol. 10).
Abstract: Many rodents, including most populations of arctic lemmings (genus Dicrostonyx and Lemmus), have cyclic population dynamics. Among the numerous hypotheses which have been proposed and tested to explain this typical characteristic of some terrestrial vertebrate communities, trophic interactions have often been presented as the most likely drivers of these periodic fluctuations. The possible role of parasites has, however, only seldom been assessed. In this study, we genetically measured the prevalence of two endoparasite taxa, eimerians and cestodes, in 372 faecal samples from collared lemmings, over a five year period and across three distant sites in Northeast Greenland. Prevalence of cestodes was low (2.7% over all sites and years) and this taxon was only found at one site (although in 4 out of 5 years) in adult hosts. By contrast, we found high prevalence for eimerians (77.7% over all sites and years), which occurred at all sites, in every year, for both age classes (at the Hochstetter Forland site where both adult and juvenile faeces were collected) and regardless of reproductive and social status inferred from the characteristics of the lemming nests where the samples had been collected. Prevalence of eimerians significantly varied among years (not among sites) and was higher for juvenile than for adult lemmings at the Hochstetter Forland site. However, higher prevalence of eimerians (Pt) was only associated with lower lemming density (Nt) at one of the three sites and we found no delayed density dependence between Nt and Pt+1 to support the parasite hypothesis. Our results show that there is no clear relation between lemming density and eimerian faecal prevalence in Northeast Greenland and hence no evidence that eimerians could be driving the cyclic population dynamics of collared lemmings in this region.
Keywords: Cestodes Eimerians Faecal prevalence Greenland Population dynamics Rodent-parasites interactions
Programme: 1036
|
|
|
|
. (2020). Circumpolar status of Arctic ptarmigan: Population dynamics and trends (Vol. 49).
|
|
|
|
. (2020). Documenting lemming population change in the Arctic: Can we detect trends? (Vol. 49).
Abstract: Lemmings are a key component of tundra food webs and changes in their dynamics can affect the whole ecosystem. We present a comprehensive overview of lemming monitoring and research activities, and assess recent trends in lemming abundance across the circumpolar Arctic. Since 2000, lemmings have been monitored at 49 sites of which 38 are still active. The sites were not evenly distributed with notably Russia and high Arctic Canada underrepresented. Abundance was monitored at all sites, but methods and levels of precision varied greatly. Other important attributes such as health, genetic diversity and potential drivers of population change, were often not monitored. There was no evidence that lemming populations were decreasing in general, although a negative trend was detected for low arctic populations sympatric with voles. To keep the pace of arctic change, we recommend maintaining long-term programmes while harmonizing methods, improving spatial coverage and integrating an ecosystem perspective.
Programme: 1036
|
|
