Phylogeography of Arctic lemmings
Arctic biota underwent dramatic changes during Quaternary glacial-interglacial periods, and these historical processes are reflected in the genes and ...
Vascular plant diversity patterns in the Canadian Arctic
The present project addresses the question: What regulates the number of species in an ecological context? This issue has two aspects: The question of the number of ...
Chromosomal evolution in Nearctic collared lemmings
The ultimate aim is to compare the geographical pattern of mtDNA variation and the distribution of chromosome races in the collared ...
How have small soil dwelling insects successfully colonized the Arctic?
... groups in the Arctic, as well as in the world, is a small soil dwelling insect called the springtail (Collembola in latin). It is one of the oldest insects with a fossil record dating back 400 million years. It has been successful in ...
Ecology, phylogeography and genetic diversity of an Arctic Daphnia species complex
... complex – An Arctic, circumpolar survey” (Hobæk 1995; Hobæk and Weider 1999). Our programme is based on collaborative efforts by researchers in Canada, Germany/USA and Norway. The general objective is to map clonal diversity, genetic ...
Biodiversity in the seed bank – could the vegetation of the Arctic change rapidly in the near future?
The biodiversity of any ecosystem includes all the species present in the standing crop (i.e. the juvenile and adult population) and the pool of species stored in dormant stages (e.g. seed banks, cysts or long-lived larval stages in insects). ...
Lichens in an Arctic environment
Lichens are an important part of Arctic vegetation as they are less affected by the coldness of these areas compared to many other organisms. In dry areas especially, ...
Genetic diversity within and between populations of Alaskan wheatgrass
The aim of this investigation of the circumpolar arctic-alpine elymus alaskanus complex is to analyse the genetic variation over the total ...
Expedition summary: Tundra Northwest – biodiversity in the Arctic tundra
... different organisms ranging from microbes, such as bacteria, algae and fungi, to higher plants and animals. The fact that these organisms live together and share a harsh Arctic environment implies that there are questions we may ask ourselves ...
Bird migration at polar latitudes: radar studies of routes, orientation, process and pattern
Study area with sited where radar observations were carried out during the Tundra northwest 1999 expedition. Many Arctic birds are renowned for their magnificent ...
Genetic variation and migration patterns of breeding Arctic waders
Many waders breeding in the Arctic tundra regions perform spectacular annual migrations to wintering areas in temperate, subtropical and tropical areas all over the world. In some species, the number of ...
Ecological energetics of Arctic breeding shorebirds
... of the Arctic bird fauna are the shorebirds. Breeding, which is an energetically costly activity irrespective of climate (Drent and Daan 1980), is especially so in the High Arctic. This is mainly due to low temperatures and high wind speeds ...
Adaptation in Arctic moths and butterflies (Lepidoptera)
The aim of this project is to investigate how some insects, particularly moths and butterflies (order Lepidoptera), have become equipped for survival and ...
Migratory orientation of savannah and white-crowned sparrows in autumn: cage experiments in Inuvik, north-western Canada
Nocturnal passerine migrants possess at least two different compass systems for orientation based on the geomagnetic field and celestial cues (stars, sun and ...
Displaced songbirds reveal the navigation system used by migrants in the High Arctic
Migratory birds have the capacity to migrate very long distances between High Arctic breeding areas and more favourable ...
Expedition summary: Tundra Northwest – migratory birds in the Arctic environment
... an extreme environment for many organisms. The primary objective of Theme C has been to make a comprehensive investigation and analysis of bird migration ecology in High Arctic North America. The approach is interdisciplinary and based on ...
Bacterioplankton and organic matter in Arctic lakes and ponds
Despite the sparseness and the exceedingly slow growth rate of its vegetation, the Arctic terrestrial ecosystem is known to be a site of net accumulation of organic matter within ...
The Arctic char; Distribution, biodiversity, and ecology across the Canadian Arctic: methods, species- and size distribution
... of the mechanisms influencing the distribution and abundance of animals and plants, how these organisms change at their species border, and how they cope with interspecific interactions and/or adapt to new environmental conditions are ...
Grazing, pigmentation and food-web composition in Arctic freshwater ecosystems
... component of the landscape. They are also vital for many terrestrial organisms, such as birds and mammals, which are attracted to water bodies for breeding and drinking. The majority of Arctic freshwater systems are shallow ponds and the ...
Interactions between zooplankton community structure and food quality in Arctic lakes
Our project aims at a better understanding of Arctic lake and pond ecosystems, in particular the role of food quality for the zooplankton ...