Abstract

A total of 460 adult and immature Sooty terns (Sterna fuscata) taken throughout their breeding season on Johnston Atoll, Central Pacific Ocean, was examined for Rhinonyssidae. Incidence of rhinonyssids in adult terns increased (possibly due to courtship billing and feeding) during the egg-laying period and decreased (possibly due to feeding of young) after the eggs had hatched. Incidence in young Sooty terns was low (2%) during their first 4 months, suggesting that transference is not very efficient. During the fifth month however, the incidence rose to 29%, suggesting that the rhinonyssids are elsewhere in the host and that they require time to travel to the nasal cavity.

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