Parental Behavior Controls Incubation Period and Asynchrony of Hatching in Magellanic Penguins

The condor

Ginger A. Rebstock¹ 

关键词: egg temperature;    incubation behavior;    incubation period;    onset of incubation;    Spheniscus magellanicus;   

DOI  :  10.1525/cond.2011.100162

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. In many species of birds, periods of incubation of eggs within a clutch depend on the order in which the eggs were laid and determine whether the eggs hatch asynchronously or on the same day. Magellanic Penguins (Spheniscus magellanicus) lay two eggs 4 days apart that hatch 2 days apart; first eggs take 41 days to hatch, and second eggs take 39 days. We tested whether temperatures of the two eggs differ and whether delayed onset of incubation caused this pattern. First eggs were cooler than second eggs during their first few days (P < 0.001). First eggs averaged 23.4 ± 0.3 °C in the first 24–48 hours after they were laid. Second eggs averaged 27.9 ± 0.3 °C, warm enough for development. Egg temperature did not stabilize (33.9 °C) until eggs were about 18 days old. We swapped first and second eggs of different nests to determine if parental behavior caused the differences in temperatures and incubation periods. First eggs treated as second eggs developed as fast as control second eggs, and second ...

【 授权许可】

CC BY