Figure 2.

(A) Approximate predation rate of Macaroni Penguins per Giant Petrel based on the total number of Giant Petrels in the study areas (methods detailed in Appendix S2; penguins older than 1 yr, solid circles; fledglings, open squares). (B) The predation pressure index reflecting the productivity rate of northern and southern Giant Petrels at Bird Island, South Georgia. Observed values (i.e., number of chicks fledged from the study area) are shown as solid circles and imputed values are shown as solid triangles with 95% credible interval.