1970 - 2004 - Average Decline In High Arctic Species' Populations 26% - Mongabay

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Between 1970 and 2004 species populations in the high Arctic have declined by 26 percent, according to the first report by the Arctic Species Trend Index (ASTI). While this may be a natural cycle, scientists are concerned that environmental impacts such as climate change are worsening natural population fluctuations in the high Arctic. Declining species include lemmings, red knot, and caribou.

"Rapid changes to the Arctic’s ecosystems will have consequences for the Arctic that will be felt globally. The Arctic is host to abundant and diverse wildlife populations, many of which migrate annually from all regions of the globe. This region acts as a critical component in the Earth’s physical, chemical, and biological regulatory system," lead-author Louise McRae from the Zoological Society of London (ZSL) said in a press release.

Some migratory species are also on the decline, such as Arctic shorebirds. However, researchers are uncertain whether this is due to changes in the Arctic or to migration stops in the south. "Migratory Arctic species such as brent goose, dunlin and turnstone are regular visitors to the UK’s shores. We need to sit up and take notice of what’s happening in other parts of the world if we want to continue to experience a diversity of wildlife on our own doorstep," Louise McRae adds.

Loss of sea ice is also a concern for a number of high Arctic species, such as polar bears, narwhales, and ringed seals, all of employ sea ice in one way or another to survive. Studies have shown declines in polar bear populations in some areas. However, the news is not all gloomy. When all the Arctic biomes are included—high Arctic (most northerly), low Arctic (between high and sub), and sub Arctic (most southern)—species populations have actually risen by 16 percent in the past 34 years. Marine animals in the low Arctic, such as bowheads and sea otters, have rebounded after regulations have successfully protected them from overharvesting and overfishing. Marine fish biomass has also increased in the North Pacific, which researchers speculate is due to warming waters. However, in the sub Arctic species peaked in the 1980s and then began to decline.

EDIT

http://news.mongabay.com/2010/0318-hance_higharctic.html

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1. See also

http://www.democraticunderground.com/discuss/duboard.php?az=show_mesg&forum=115&topic_id=236887&mesg_id=236887