Standard CCAMLR (CEMP) monitoring methods were implemented in 1996. Prior to this date, counting methods and timing of counts may have varied, which should be considered when comparing counts and calculating inter-annual trends from previous seasons.

For some seasons, only information on specific parameters was possible to obtain (when the base would open late/shut early). In some years, certain data pertaining to chick counts was not possible to obtain. For NA values in the column titled ''Total number of nests without eggs", which is carried out mid-season, some, if not all failed nests are abandoned by the time of the survey. Their stones are then stolen by other nesting birds, and the nests are no longer visible to field assistants. Abnormalities or the lack of data collected for other reasons is explained in the comments alongside that season''s data.

More details on the counts can be provided upon request to the Polar Data Centre.

For this publication on annual gentoo penguin population monitoring, individual colony counts across the island were combined into totals per season. For additional details as to colony counts within Signy Island, please contact the Polar Data Centre.