Intrinsic and extrinsic controls on foraging effort in an iconic Benguela seabird

Seabirds are upper trophic level predators and as such reflect bottom-up changes in the conditions of their prey species through behavioural or demographic changes. This is especially useful in fisheries management where seabirds can act as biomonitors of commercially-important prey species, potentially providing an attractive, albeit coarse, supplementation to expensive and labour-intensive conventional stock surveys. The Cape gannet Morus...