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The choice of breeding site is a key reproductive decision for long-lived seabirds. Individuals pioneering new sites face unknown risks (e.g., unfavourable predator regimes, climate), but potential breeders may derive information about reproductive opportunities from the presence of conspecifics, just as local enhancement is used to derive information about local feeding conditions. We suggest here the information barrier hypothesis: the presence of nesting birds may furnish cues about local breeding conditions (e.g., abundant food, safe places to nest); this information advantage may deter dispersal to new habitat, even though good breeding sites may be available elsewhere. By settling at an established site, individuals gain confidence that local conditions are favourable for breeding, whereas individuals pioneering new sites receive no such promise. This information barrier may entice individuals to remain at colony sites even when breeding vacancies are few, and new recruits must queue for openings.
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