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Tag: Species

Pasture land in the Caucausus ecoregion
Overgrazing and uncontrolled livestock grazing threatens steppe, subalpine and alpine ecosystems. A third of pasturelands in the region are subject to erosion. Sheep grazing in the winter ranges and the steppes and semi-...
29 Jan 2008 - by WWF-Caucasus, design Manana Kurtubadze
The economy of legal wildlife trade
The trade in wild species can contribute significantly to rural incomes, and the effect upon local economies can be substantial. The high value of wildlife products and derivatives can also provide positive economic inc...
12 May 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Money talks for turtles - conservation and economy
Marine turtles have been used for eggs, meat, shell, oil, leather or other products for 7000 years. Modern times have introduced another way for society to profit from these species - to generate economic income as a tou...
12 May 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Protected areas, Arctic and Antarctic
Protected areas are very important for conserving biodiversity. In these areas, human activities are managed to achieve specific conservation goals, for example, to protect a certain species or to conserve a representati...
31 Jul 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Coldwater coral reefs, distribution
Scientists are just beginning to learn about the many species in the remote, deep waters of the polar oceans. Corals, for example, are not limited to the warm, shallow waters of the tropics. They also exist in many cold,...
31 Jul 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
Projected impacts of climate change
Global climate change may impact food production across a range of pathways (Figure 17): 1) By changing overall growing conditions (general rainfall distribution, temperature regime and carbon); 2) By inducing more ex...
02 Feb 2009 - by Hugo Ahlenius, UNEP/GRID-Arendal
Possible individual ranges of yield and cropland area losses by 2050
Figure 24: Possible individual ranges of yield and cropland area losses by 2050 with climate change (A2 scenario), non-food crops incl. biofuels (six OECD scenarios), land degradation (on yield and area, respectively, s...
02 Feb 2009 - by Hugo Ahlenius, UNEP/GRID-Arendal
A photographic impression of the gradual changes in two ecosystem types
Globally, over 1,000 (87%) of a total of 1,226 threatened bird species are impacted by agriculture. More than 70 species are affected by agricultural pollution, 27 of them seriously. Europe’s farmland birds have decl...
02 Feb 2009 - by Hugo Ahlenius, UNEP/GRID-Arendal
The bushmeat chain reaction
As many of the parks and surrounding forests have lost 50–80% of their wildlife species, typically antelopes, zebras and other ungulates, the poachers are increasingly targeting primates including gorillas, bonobos and c...
01 Mar 2010 - by Riccardo Pravettoni
Invasive species response to climate change - Hydrilla spp, current and 2080 habitat suitability
As climate change alters Arctic ecosystems and enables greater human activity, biological invasions are likely to increase in the Arctic. To some extent, Arctic terrestrial ecosystems may be predisposed to invasion becau...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Trends in vegetation biomass, Ellsmere Island 1995-2007
Data from many sources and at several scales suggest that recent climate change is already affecting terrestrial Arctic ecosystems. Comparisons of historical and contemporary aerial photographs provide evidence that Arct...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Definition of the geographic areas covered in the Arctic Biodiversity Assessment
The Arctic Council study on trends in the polar ecosystems - the Arctic Biodiversity Assessment (ABA) focuses on the areas displayed in this map. The high- and low Arctic regions are defined from the bioclimatic zones in...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Disappearing lakes - Old Crow Basin, Canada (1951-2001)
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
Protected Areas in the Arctic
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
Wild rangifer population trends
Wild reindeer and caribou, Rangifer tarandus, are widely distributed around the circumpolar Arctic where they play a key role in the environment, culture, and economy of the region. One of the two major wild reindeer po...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
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
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