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Arctic terrestrial species trends 1970-2005 (ASTI)

Arctic terrestrial species trends 1970-2005 (ASTI)

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Uploaded 21 Feb 2012 by GRID-Arendal
Year: 2010 Author: Hugo Ahlenius, GRID-Arendal & CAFF
Description:
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 changes is essential in order to develop effective conservation and adaptation strategies. Arctic species that are adapted to these extreme environments are expected to be displaced, in part, by the encroachment of more southerly species and ecosystems. A total of 965 populations of 306 species (representing 35% of all known Arctic vertebrate species) were used to generate the Arctic Species Trend Index (ASTI). Presented in this figure is the terrestrial component of the ASTI. The moderate decline in the terrestrial index (–10%) is largely a reflection of declines (–28%) in terrestrial high Arctic populations (mostly herbivores, such as caribou, Rangifer tarandus, lemmings, and the High Arctic brent goose, Branta bernicla). Terrestrial low Arctic population increases (+7% ...
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