During the breeding season, some Eurasian Oystercatchers (Haematopus ostralegus osculans) in Yubu Island foraged in the open mudflat area nearby the breeding ground, instead of the tide water line area, main feeding site throughout the year. We found significant differences in foraging behavior and prey species diversity between the two different feeding site types. Even though the birds took more steps for most probably searching preys, their feeding success was much lower in the open mudflat area than the tide water line area. The multiple peck and boring methods were more frequently adopted to catch polychaetes on the open mudflat area, whereas the single peck method was dominant and gastropods and bivalves were main preys in the tide water line area. This study suggests that the bird shows flexible foraging strategy of shifting feeding site, foraging behavior and preys for better reproductive success.
A total of 12 genera, 37 species in the subfamily Eumeninae was recognized from the insect collection of several universities and institute in Korea (Seoul National University, Kangwon National University, National institute of Agricultural Science & Tech.).
In 2007, 13 species in 9 genera were collected throughout the country by sweeping net and bamboo nest traps. Among them, Anterhynchium flavomarginatum koreanum (86 specimens), Discoelius zonalis (29 specimens), and Euodynerus dantici (20 specimens) were most dominant. One species (Stenodynerus sp.) was confirmed as new to science.
Using the bamboo nest traps, 7 species of Eumenid wasps were collected and the larvae of Gelechids and Pyralids were confirmed as the prey of Discoelius zonalis and Anterhynchium flavomarginatum koreanum, respectively.
27 항온조건(60-70% RH, 16L : 8D)에서 꽃노랑총채벌레(Frankliniella occidentalis) 2령유충, 목화진딧물(Aphis gossypii) 1-2령 약충, 점박이응애(Tetranychus urticae) 난을 먹이충으로 공급하였을 때, 애꽃노린재의 발육, 생존율, 성충수명과 산란수를 조사하였다. 암/수별 약충의 발육기간은 각각 12.2/12.8, 13.0/13.2, 17.9/17.8일로, 꽃노랑총채벌레 2령 유충을 먹이로 공급하였을 경우 가장 짧았다. 애꽃노린재 약충 기간동안 생존율은 각각 96.4, 78.4, 73.8%3-꽃노랑총채벌레 2령 유충을 먹이로 공급하였을 경우 가장 높았다. 암/수의 성충수명은 각각 55.9/51.0, 30.2/30.8, 25.8/ 25.1일로 꽃노랑총채벌레의 2령을 먹이로 공급하였을 경우 가장 길었으며, 암컷 성충의 일일산란 수는 각각 5.6, 4.1및 1.9개였다. 꽃노랑총채벌레를 먹이로 공급하였을 때 애꽃노린재는 우화 후 3-4일 경부터 산란을 시작하여 20-40일 사이에 가장 많이 산란하였고, 일일평균 최대산란수는 7-8 개였다.