INCUBATION SHARING OF NORTHERN BALD IBIS PARTNERS

Abstract

The study was carried out during the free-flying period. Pairs share the incubation between the two sexes. In observations made between 2013 and 2015 (n=79 in day). Females incubated for 177.08 minutes per day on average while males incubated for 240.99 minutes per day. This incubation period is statistically different (P< 0.0001) withmales staying 23-32% longer than females. Females and males stayed in incubation together for only a short time. According to observations made(n=79), couples stay together on nests for 20.52 minutes in average. During the observations made all day long it was realized that eggs are left alone only 0.40 minutes on average.Incubation periods did not vary according to years. According to the observations made in 2013 (n=100) period for staying in the nest were not different than observations of years 2014 and 2015 statistically (P>0.05). According to 2014 (n=128) and 2015 (n=88) results no statistical difference could be observed between incubation periods (P >0.05).The excess eggs during incubation are protected by northern bald ibises which does not have any nest (altruism). From time to time synchronized behaviors can be observed in the population.

Keywords

• female sitting time
• male sitting time
• breeding
• Geronticus eremita
• altruistic behavior

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