Post-hatching testosterone concentration reflects nestling survival and pre-fledging offspring condition in the Tawny Owl Strix aluco

Författare

  • L. Sasvári
  • I. Nishiumi
  • P. Péczely
  • Z. Hegyi

Abstract

We examined parental condition, brood sex composition, hatching order and post-hatch-ing testosterone concentration in relation to nestling survival and pre-fledging offspring condition on Tawny Owls Strix aluco in Duna-Ipoly National Park, Hungary in 1996– 2007. In smaller broods, where parents of poor condition suffered nestling mortality, hatchlings showed a male-biased sex ratio, and between-sibling differences in testoster-one concentrations were high in the early nestling period. In broods where all nestlings were raised and parents were in good condition, hatchlings showed a female-biased sex ratio and between-sibling differences in testosterone concentrations were low. First-and second-hatched nestlings, with high post-hatching testosterone concentrations, survived after one or two siblings died and had better body condition before fledging than nestlings which fledged from the broods, where all were chicks raised.
Sektion
Research articles

Publicerad

2010-03-31

Referera så här

Sasvári, L., Nishiumi, I., Péczely, P., & Hegyi, Z. (2010). Post-hatching testosterone concentration reflects nestling survival and pre-fledging offspring condition in the Tawny Owl Strix aluco. Ornis Fennica, 87(1), 26–34. https://doi.org/10.51812/of.133739