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Article Dans Une Revue General and Comparative Endocrinology Année : 2020

Prolactin is related to incubation constancy and egg temperature following a disturbance in a precocial bird

Résumé

To maximize fitness, parents may trade-off time and energy between parental care and self-maintenance. In vertebrates, prolactin and corticosterone are two important hormones that regulate parental investment because they stimulate parental care and mobilize energy, respectively. Further, concentrations of both hormones change in response to disturbances. One of the most important parental care behaviors in birds is incubation, since small changes in egg temperature have large effects on offspring. We investigated how prolactin and corticosterone may mediate parental incubation constancy (i.e., the daily amount of time spent incubating eggs) and regulation of egg temperature. We collected blood samples from female wood ducks (Aix sponsa) near the start and end of the incubation period to measure baseline and stress-induced (30 min after capture and restraint) hormone concentrations. We also quantified incubation constancy and egg temperature using artificial egg temperature loggers. As expected, prolactin decreased and corticosterone increased after 30 min of capture and restraint. Corticosterone concentrations (baseline and stress-induced) were negatively related to body mass, but were not related to incubation constancy. In contrast, prolactin concentrations (baseline and stress-induced) were higher at the end than the start of the incubation period, and stress-induced prolactin concentrations were positively related to incubation constancy following a nest disturbance (i.e., capture). Further, prolactin (baseline and stress-induced) concentrations were positively related to egg temperatures, but only after the disturbance. These results suggest that prolactin may be associated with the regulation of parental incubation constancy and resulting heat-transfer after a disturbance, which may ultimately affect offspring development.

Dates et versions

hal-02542134 , version 1 (14-04-2020)

Identifiants

Citer

Sydney Hope, Sarah Durant, Frédéric Angelier, John Hallagan, Ignacio Moore, et al.. Prolactin is related to incubation constancy and egg temperature following a disturbance in a precocial bird. General and Comparative Endocrinology, 2020, 295, pp.113489. ⟨10.1016/j.ygcen.2020.113489⟩. ⟨hal-02542134⟩
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