Newfoundland Northern Gannet colony survey and immature age composition 2023.xlsx

All Northern Gannets observed on photographs were categorized as either adults or immatures, with the latter being sub-categorized by type. Birds that were only partially visible and obscuring the wings or back were assumed to be adults, unless immature features could otherwise be seen. This approach underestimates the proportion of immatures present and therefore the estimated proportion of immatures present at the colonies should be viewed as a minimum.