We determined how the presence of heterospecific individuals in the vicinity of a focal individual affects the behavior of two critically endangered species of cranes on their wintering grounds at Cheolwon in the Korean Demilitarized Zone. The red-crowned crane, Grus japonensis, is larger than the white-naped crane, Grus vipio, and it dominates the white-naped crane in aggressive interactions. We showed that the dominant species increases foraging activity in the presence of the subordinate species presumably because of scrounging of food from the subordinate. Because interspecific interactions may affect avian endangerments these behavioral findings should be taken into account when managing winter refuges for the two endangered crane species.
Bibliographical noteFunding Information:
Acknowledgements This study was funded by the following organizations: the Crowder Messersmith Conservation Fund (2005), the KOSEF International Program (2005–2006; research fellowship), and the JSPS (fellowship 2006) and KRF-2005-003-C00162.
- Demilitarized Zone
- Endangered species
- Group size
- Grus japonensis
- Grus vipio