Geographic coverage of the North Pacific Pelagic Seabird Database (NPPSD) in the Version 1.0 release (Black points; see Drew and Piatt 2005 [PDF 6 MB]for details on Ver. 1.0) and new samples added in the Version 2.0 release (Red points). Click on image for a larger view.
Distribution of cumulative sampling effort in the North Pacific Pelagic Seabird Database (NPPSD) Ver. 2.0, over the time period 1973-2012. Samples were binned into 50 x 50 kilometer cells and summed over all years. Click on image for a larger view.
Maps showing sum of area sampled during four time periods (A) 1973–1982, (B) 1983–1992, (C) 1993–2002, and (D) 2003–2012. Cells are 50 × 50 km. Click on images for a larger view.