Time budgets and habitat use of White-naped Cranes Grus vipio in the Ulz river valley, north-eastern Mongolia during the breeding season

Sammanfattning

Habitat loss and degradation are critical threats for the globally threatened White-naped Crane Grus vipio. We estimated the size of the area used per day and the time budgets of parental and non-parental White-naped Crane pairs in north-eastern Mongolia during 2000 and 2001. Six parental crane pairs used an area Of 11-155 ha per day. The maximum distance of a focal parental crane from the roosting-site was 3,030 m. Habitat conservation measures for breeding White-naped Cranes need to be targeted to within at least 3 km of the roosting-site or nest-site. Parental cranes spent 79.6 +/- 4.8% of the daylight period foraging and had reduced preening and resting behaviour to 4.4 +/- 1.9%. Pairs without juveniles showed a pronounced period of resting and preening behaviour during midday, which was absent in parental cranes. This indicates that parental cranes may be time-stressed. We conclude that increases in feeding-related activities (e.g. caused, by a decrease in food availability) are likely to be at the expense of parental vigilance. Conversely, increases in vigilance (due to e.g. increased disturbance) may have a negative impact on feeding-related activities. Both increases can potentially negatively affect reproductive success in this Vulnerable species.

Publicerad i

Bird Conservation International
2007, Volym: 17, nummer: 3, sidor: 259-271 Utgivare: CAMBRIDGE UNIV PRESS

UKÄ forskningsämne

Ekologi


Publikationens identifierare

DOI: https://doi.org/10.1017/S0959270907000767

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/86579