Fig. 5 Foraging circle refinement on the Great Barrier Reef, Australia.
Panel a) shows foraging circles and refined foraging circles (over more
suitable predicted habitat), mapped for each species using their GBR
breeding sites. Panel b) plots increasing simulated foraging circle
refinement at each GBR breeding site, and where the thresholds used for
refined foraging circles mapped in a) lie in relation to the trade-off
between size and refinement confidence. If GBR colonies have local
tracking data then colony foraging circles are refined using GBR
colony-specific models (yellow); otherwise global foraging circles are
refined using multi-colony models (blue). Unrefined foraging circles are
mapped and their areas shown at habitat suitability percentiles of 0.
Refined foraging circles from transferability-supported refinement are
shown in green. Refined foraging circles from area-limited refinement
are shown in red for colonies that need further refinement to get below
a 100,000 km2 limit (purple dotted line). Greater
foraging circle refinement reduces the confidence that refined foraging
areas include known foraging areas, as demonstrated for a red-footed
booby (RFBO) colony (see supporting information for breakdown of
predicted known foraging area inclusion at all GBR breeding sites).
Table 5 Summary of foraging area of the Great Barrier Reef breeding
seabird community. Total foraging area is estimated from unrefined
global foraging circles and refined foraging circles from
transferability-supported refinement and area-limited refinement
(<100,000km2). The foraging areas generated
by both refinement methods are supported by associated refinement
confidence (predicted probability that refined foraging circles contain
known foraging areas). All species totals represent total foraging area
of all colonies, with overlapping areas dissolved. For a breakdown of
results per colony see supporting information.