2010

Assessment of the incubation period for each sex of Turkish semiwild Northern Bald Ibis (Geronticus eremita)

The semiwild population of Northern Bald Ibises (Geronticus eremita) at Birecik, Turkey, are the final representatives of theEastern population of the species in the Middle East, apart from a few captive birds in Turkish zoos. This study took place between 2012and 2015. Breeding is highly synchronized among the colony and incubation behavior was monitored for multiple nests throughoutthe day. Differences were found when incubation duty period was examined according to sex. In 2013, the incubation period variedsignificantly between males and females (F = 71.059, P < 0.001). The female incubated eggs for 178.42 min per day on average, while themale incubated for 233.69 min per day on average. A significant difference in incubation was determined between males and females (F= 91.260, P < 0.001) in 2014. Females sat on eggs for 188.06 min on average, while males sat on eggs for 244.13 min on average. In 2015the incubation period varied significantly by sex, similar to previous years (F = 79.871, P < 0.001). The female incubated for 159.66 minin average, while the male incubated for 223.07 min on average.

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