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Tag: Biodiversity

Trends in Arctic shorebird populations
Shorebirds are the most diverse group of Arctic breeding birds and one of the most abundant. From the Arctic, they migrate to their non-breeding grounds along well-defined flyways that circle the world. As a group, howe...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Distribution and current trend of polar bear subpopulations throughout the circumpolar Arctic
Polar bears occur in 19 relatively discrete subpopulations with an estimated worldwide abundance of 20,000– 25,000 animals. Our knowledge of the status and trend of each subpopulation varies due to availability, reliabil...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Murre sensitivity to changes in temperature
Annual rates of population change of individual murre colonies during 12 years after the 1977 climatic regime shift in the North Pacific and during 9 years after the 1989 shift, in relation to changes in sea surface temp...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Trends in Arctic murre populations
The two species of murres (known as guillemots in Europe), the thick-billed murre, Uria lomvia, and common murre, Uria aalge, both have circumpolar distributions, breeding in Arctic, sub-Arctic, and temperate seas from C...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Distribution of common eider, breeding and wintering ranges in the Arctic
The common eider, Somateria mollissima, has a circumpolar distribution breeding mainly on small islands in Arctic and boreal marine areas in Alaska (Bering Sea region), Canada, Greenland, Iceland, western Europe, and the...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic sea ice food web - schematic illustration
Sea ice represents a unique ecosystem in the Arctic, providing habitat to specialized iceassociated species that include microorganisms, fish, birds, and marine mammals. Individual species use sea ice in different ways d...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Ice coverage and primary production in the Arctic
Temperature changes may influence fish populations both directly, through shifts to areas with preferred temperature, and indirectly through the food supply and the occurrence of predators. The length of the ice-free per...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Protected Areas in the Arctic by IUCN category
Protected areas have long been viewed as a key element for maintaining and conserving Arctic biodiversity and the functioning landscapes upon which species depend. Arctic protected areas have been established in strategi...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Distribution and trends of wild Rangifer in the Arctic
Distribution and observed trends of wild Rangifer populations throughout the circumpolar Arctic (from The Circum Arctic Rangifer Monitoring and Assessment Network, CARMA). Note: Wild boreal forest reindeer have not been ...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic char species complex, distribution map
The Arctic char species complex, sensu stricto, represent a key component of the marine and freshwater ecosystems of the north. Chars are stressed by factors such as fisheries, climate change and pollutants. We are possi...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Location of datasets in the Arctic Species Trend Index (ASTI)
Dramatic changes, such as sea ice loss, are projected to occur in Arctic ecosystems over the next century. Understanding how the Arctic’s living resources, including its vertebrate species, are responding to these change...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Red Knot, distribution, breeding areas and migratory routes, by subspecies
The red knot, Calidris canutus, is an example of a longdistance migratory shorebird. It has been the subject of extensive research worldwide including studies on its breeding cycle, winter ecology, and stopover sites. It...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
The Arctic and the World - migration paths
The Arctic plays host to a vast array of biodiversity, including many globally significant populations. Included among these are more than half of the world´s shorebird species, 80% of the global goose populations, sever...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Arctic conservation area (CAFF), topographic map, ABA version (2010)
The Conservation of Arctic Flora and Fauna is a working group under the Arctic Council, for the countries of Russia, Denmark, USA, Canada, Sweden, Iceland, Norway and Finland and indigenous peoples. Monitoring, assessmen...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Advancement of phenological events in high-arctic Greenland
It is clear from lower latitudes that phenological trends are linked to temperature changes and experimental warming also results in earlier plant phenology. Yet, in Arctic and alpine ecosystems, the melting of the winte...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Reindeer herding - vegetation impacts (Norway and Finland)
A very high-resolution false color Ikonos-2 satellite image of Jauristunturit in the border zone shared by Norway and Finland. Image acquired 28 June 2001. The main vegetation type is lichen dominated tundra heath with d...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Wild food harvests in Alaska by area, 1990s
The harvest of natural resources is a key feature of traditional lifestyles and economies throughout the Arctic, and a continuing reliance on it as a mainstay of indigenous existence in the north is evident. In Alaska, w...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Disappearing Arctic lakes - examples in Siberian lakes, 1973 to 1997
The Arctic contains a variety of types of lakes but overall, it is thermokarst lakes and ponds that are the most abundant and productive aquatic ecosystems in the Arctic. They are found extensively in the lowland regions...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Murre colonies in the Arctic
The two species of murres (known as guillemots in Europe), the thick-billed murre, Uria lomvia, and common murre, Uria aalge, both have circumpolar distributions, breeding in Arctic, sub-Arctic, and temperate seas from C...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Trends in Arctic vegetation productivity 1982-2005 (Greening of the Arctic)
Arctic vegetation has undergone enormous change in the past, most notably in response to the glacial and interglacial periods of the Quaternary. Data from many sources and at several scales suggest that recent climate ch...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
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