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. Prolactin  levels  rapidly ,drop ,after  breeding failure in several terrestrial bird species, but in penguins prolactin  secretion  can  be  maintained ,well  after failure.  We  measured ,prolactin  secretion  in  relation to reproductive failure in a tropical seabird, the Red-footed Booby  (Sula  sula).  Incubation  failure  was  recorded in  7 nests (2 accidental losses, 5 desertions). Prolactin titers  significantly  decreased  after  incubation  failure. In  birds  that  accidentally  lost  their  egg,  prolactin titers declined but measurements,12 to 24 hr after failure  were ,still  above ,basal  levels.  Birds  naturally deserting  their  egg  exhibited  prolactin  titers  typical of basal levels 6-24 hr after abandonment. Two birds showed lower prolactin concentration as early as 4-8 days  before  nest  desertion,  suggesting  that  a  decline in prolactin levels may precede egg desertion. This study  shows  that  in  this  tropical  seabird,  incubation failure  results  in  a ,rapid  cessation  of  prolactin secretion, as it does for terrestrial birds. Key words: incubation failure, prolactin, Red-foot-

PATTERNS OF PROLACTIN SECRETION IN RELATION TO INCUBATION FAILURE IN A TROPICAL SEABIRD, THE RED-FOOTED BOOBY