Figure 2. The guillemot survey sections and modelled air pressure on the cliffs of Skomer. a) The distribution of breeding guillemots. Areas classified as both densest and largest are indicated in red (n = 7 sections). Areas that were identified as either among the largest (n = 3) or densest (n = 4) are indicated in orange respectively. Residual occupied areas are indicated in yellow. b) Modelled air pressure at 2 m normal to the surface around Skomer for the SW wind direction (indicated with a black arrow). High pressure regimes are a feature of exposed cliffs, while pressure is lower in sheltered areas and over the main island.