| Titre : | Breeding behaviour of the European Roller Coracias garrulus observed from inside of a nest-box in Southern France (2016) |
| Auteurs : | Jerome Guillaumot, Auteur |
| Type de document : | Article |
| Dans : | Alauda (84(1) 2016) |
| Article en page(s) : | 1-22 |
| Résumé : | The continuous survey of a nesting pair of European Roller recorded from inside of a nest-box by a photo and video monitoring allowed to collect data about the reproduction of this species. This study showed that the incubation period has been markedly longer than usually known for this species (27 days as compared to 20 days). The monitoring revealed that the 10-day gap between the first and the last egg laid has mainly been catched-up during the rearing period, the youngest nestling fledged only 3 days after the eldest one. The discontinuous incubation during the days following the laying of the first egg, the special care for the last hatched young by the female and the absence of any aggressiveness among the nestlings may explain this catch-up. There is a specialization in the role played by the male and the female during the 10 first days of rearing period: the male was in charge of most of prey hunting while the female delivered preys to the young after the prey has been transferred to her by the male. Later on, roles are less differentiated. Young hatched blind and bared. Eyelids started to open from day 5. Sheaths opened and feathers appeared from day 13 (day 17 in other studies). Finally, 6 young fledged after 26 days, ranking them in the 5% most productive clutches recorded. The study also showed that the use of a nest-box may secure the breeding success of a threatened species like the European Roller in an area where preys are abundant but natural cavities are rare. It was also a good test for the harmlessness of the used monitoring method during this study. |
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