Figure 2. Correlation between inter-annual differences in penguin featherδ¹³C values and in sea-surface Chl a (corresponding years).

Values are mean ± SE. Numbers in parentheses indicate sample sizes (N = 70). Solid line represents the linear regression (y = 20.87x+0.20, r = 0.354 and p = 0.003). Abbreviations: AP, Adélie penguin; GP, gentoo penguin; KP, king penguin; MP, macaroni penguin; NRP and SRP, northern and southern rockhopper penguins, respectively.