Re-Constructing Historical Adélie Penguin Abundance Estimates by Retrospectively Accounting for Detection Bias
Fig 4
Re-construction process and outcome for a historical count of chicks at Mackellar Islands, east Antarctica.
A: distribution of original count data; B: time series counts from time-lapse cameras, with date range of original count shaded in blue; C: distribution of adjustment factors for the date range of the count, standardised to the maximum number of occupied nests; and D: distribution of estimates of the maximum number of occupied nests. Although chicks are present at the breeding site from late December when they hatch to late February when they leave the site to begin foraging, time series counts in panel B were only made from mid to late January when chicks remain at or close to their nest site and are large enough to be highly detectable in camera images.