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Annual abundance of two lemming species estimated by snap-trapping (up to 2003) and live-trapping (after 2003) in the Qarlikturvik Valley of Bylot Island from 1993 to 2012. The inset shows the 3-year running mean abundance for brown lemmings over the same period. The regression line shows the temporal trend (1989 = year 0 in the regression equations).
