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http://dx.doi.org/10.11626/KJEB.2019.37.4.483

Comparison of the foraging efficiency between adult and immature Eurasian Oystercatchers (Haematopus ostralegus osculans) during the breeding season on Yubu Island  

Lee, Sang-Yeon (National Ecosystem Survey Team, National Institute of Ecology)
You, Young-Han (Department of Biological Sciences, Kongju National University)
Jeong, Gilsang (Long Term Ecological Research Team, National Institute of Ecology)
Choi, Yu-Seong (National Migratory Birds Center, National Institute of Biological Resources)
Joo, Sungbae (Evolutionary Ecology Research Team, National Institute of Ecology)
Publication Information
Korean Journal of Environmental Biology / v.37, no.4, 2019 , pp. 483-492 More about this Journal
Abstract
During the breeding season, both adults and immature Eurasian Oystercatchers (Haematopus ostralegus osculans) were observed to feed on prey, such as gastropods (Umbonium thomasi) and bivalves, at the tide water line around Yubu island in Korea. To determine differences in the foraging efficiency between the adult and immature birds, we recorded the feeding behavior using digiscoping with a telescope and a smartphone. We compared the pace, the prey search rate, the proportion of prey search techniques, the feeding success rate, the handling time, and the heads-up rate between the adult and immature birds. There were significant differences in the proportion of prey search techniques when gastropods were consumed and in the prey search rate and heads-up rate when bivalves were consumed but there were no significant differences in feeding success rates. Therefore, although the immature birds on Yubu Island were inferior to adults during the breeding season and they lacked the proficiency to locate prey, their overall foraging efficiency was similar to adults. This was considered to be due to the continuous eating of bivalves during the wintering season, which requires a high level of foraging efficiency.
Keywords
adult; breeding season; foraging efficiency; Haematopus ostralegus osculans; immature; Yubu Island;
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