Figure 1 map of marine bird surveys at sea for NPPSD

Fig 1 map showing total sampling effort (strip transects) of marine bird surveys at sea in the North Pacific Pelagic Seabird Database (NPPSD). Strip survey transects (“samples”) in an area spanning the North Pacific from the Arctic to Hawaii, and from California to South Korea, an area that is about 50% larger than the continental United States. One of the maps displaying the spatial-temporal variability in the NPPSD 3.0 data.