Individual study: Effect of culling yellow-legged gulls Larus michahellis on Audouin's gulls Larus audouinii nesting on AlborÃ¡n Island, Andalucê, Spain
Paracuellos M. & Nevado J.C. (2010) Culling yellow-legged gulls Larus michahellis benefits Audouin's gulls Larus audouinii at a small and remote colony. Bird Study, 57, 26-30
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Control avian predators on islands
A before-and-after study on Alborán Island (7 ha), southern Spain (Paracuellos & Nevado 2010), found that the population of Audouin’s gulls Larus audouinii increased from an average of 181 pairs in 1997-2000 to 626 pairs in 2009, following the control of yellow-legged gulls Larus michahellis from 2000 to 2009. Reproductive success also increased, from 0.3 chicks/pair in 1997-2000 to 0.25-0.9 chicks/pair in 2000-9. On average 106 adult yellow-legged gulls were culled each year, approximately 25% of the breeding population. Combined with the destruction of all eggs found, this reduced the population of gulls from 320-440 pairs in 1997-2000 to approximately 100 pairs in 2009.