Summary of relative density (seabirds/km2) and the number of cell-days occupied by each species.

Relative density summaries were calculated only for cell-days where the species was present. As cell-days were filtered for co-occurrence (> 1 species), multiple species occurred within each cell-day. Species are listed in decreasing order of mean relative density. “Breeding origin” is a generalization of the breeding range for each species and reflects where most individuals observed in the nGoM are assumed to breed based on geographical ranges and migratory patterns. Cell-day = a single 10 x 10 km cell with seabird observations in a given day.