Translator Disclaimer
1 June 2011 Altitudinal Variation in Parental Provisioning of Nestling Varied Tits (Poecile varius)
Jong Koo Lee, Ok-Sik Chung, Woo-Shin Lee
Author Affiliations +
Abstract

We recorded parental provisioning rates of Varied Tits (Poecile various) at different altitudes (n  =  17, 7, and 11 nest boxes at 300, 900, and 1,400 m, respectively) to examine if males and females cooperate in response to increased provisioning pressure due to nutritional demands of nestlings. Females provisioned nestlings more than males irrespective of altitude. Provisioning rates of males and females tended to increase with elevation, but the increase was greater for males. Provisioning was low early in the nestling period, and gradually increased reaching a peak between 9 and 10 days after hatching. The provisioning rate of females at the peak provisioning period (8–10 days) did not increase markedly at any altitude. Provisioning by males during the peak period increased and they contributed more during this period than at other times. The provisioning rate of males increased linearly with elevation. The provisioning rate of female Varied Tits also increased with elevation, but the increment ratio was lower than that of males. Changes in provisioning rates with elevation may be due to the need to invest more in parental care under unfavorable environmental conditions. Parents at high altitudes experience more difficulty provisioning, not only because of nestling growth, but also because provisioning is required more often. Thus, increased provisioning by males, which have a lower provisioning frequency relative to females, may be an investment to reduce foraging pressure on females and to ensure survival of nestlings.

Jong Koo Lee, Ok-Sik Chung, and Woo-Shin Lee "Altitudinal Variation in Parental Provisioning of Nestling Varied Tits (Poecile varius)," The Wilson Journal of Ornithology 123(2), 283-288, (1 June 2011). https://doi.org/10.1676/10-106.1
Received: 30 June 2010; Accepted: 1 December 2010; Published: 1 June 2011
JOURNAL ARTICLE
6 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top