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The North Slope Eider Survey has been conducted for 10 consecutive years, 1992 to 2001. Survey techniques have remained constant, except that since1997 observations have been dictated directly into computers that were connected to an onboard GPS, giving precise coordinates for all observations. The survey pilot was the same person for all years, while the(More)
We used data from aerial surveys (1992-2010) of >100,000 km(2) and ground surveys (1998-2004) of >150 km(2) to estimate the density and abundance of birds on the North Slope of Alaska (U.S.A.). In the ground surveys, we used double sampling to estimate detection ratios. We used the aerial survey data to compare densities of birds and Arctic fox (Vulpes(More)
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