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Vigilance responding to number of conspecifics among mixed groups of cranes in demilitarized zone

Animal Cells and Systems 2018년 22권 2호 p.118 ~ 123
Jablonski Piotr G., 이상돈, Ellwood Elizabeth,
소속 상세정보
 ( Jablonski Piotr G. ) - Seoul National University Department of Biological Sciences
이상돈 ( Lee Sang-Don ) - Ewha Womans University College of Engineering Department of Environmental Science and Engineering
 ( Ellwood Elizabeth ) - Natural History Museum of Los Angeles County La Brea Tar Pits and Museum

Abstract


Numerous studies have addressed antipredatory benefits of mixed-species flocks of foragers, but studies on individual's vigilance as a function of group size are limited. In the Cheolwon area of the Korean Demilitarized Zone, vigilance of the subordinate White-naped cranes (Grus vipio) in 11 groups composed of conspecifics and the dominant Red-crowned cranes (Grus japonensis) was examined. Vigilance correlated negatively with group size due to negative correlation with the number of conspecifics, but not the dominant heterospecifics. This is consistent with the hypothesis that a decrease in vigilance in larger groups is due to antipredatory benefits from increased predator detection in larger groups (associated with the presence of a larger number of conspecifics). This suggested that the mechanism leads to canceling out of the otherwise expected antipredatory benefits to the subordinate species from the increased predator detection by larger group size (associated with larger number of dominants). This is one of only a few behavioral studies of these endangered crane species in the relatively inaccessible wintering area of international importance in the areas of high conservation value.

키워드

DMZ; endangered species; group size; Grus japonensis; Grus vipio

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