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Use constraints
Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports. For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Hugo Ahlenius, UNEP/GRID-Arendal)
Source(s)
Borgstrøm, R. and Museth, J. (2005). Accumulated snow and summer temperature – critical factors for recruitment to high mountain populations of brown trout Salmo trutta L.. Ecology of Freshwater Fish, 14, 375–384
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Uploaded on Tuesday 21 Feb 2012
by GRID-Arendal
Variations in snow depth and ice cover, alpine lake at Hardangervidda plateau, Norway
Year:
2007
Author:
Hugo Ahlenius, UNEP/GRID-Arendal
Description:
Climate warming means that lowland lakes typically are experiencing longer ice-free periods, promoting greater biological productivity. However, despite this warming trend, biological productivity may be reduced, at least temporarily, in alpine areas with increased winter precipitation. During years with high winter precipitation in alpine areas of western Norway, in spite of higher temperatures, fish growth and recruitment were lower than in low-snowfall years. Annual fish growth rates were negatively correlated with spring snow depth – the greater the snow depth, the less the fish grew. During the years 1992 to 1995, a period with mean spring snow depth of 275 cm, fish growth was reduced by 50% compared to years with much less spring snow accumulation (1991 and 1996). A further increase in winter snowfall in these regions, as projected by climatic scenarios, would be expected to result in further reductions in biological production.
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