韓国産鳥類の育雛期の食習性(III)

抄録

Observations and analysis of nestling foods of the following seven species were made May to July 1968: permanent residents: Dendrocopos major hondoensis, Parus major wladiwostokensis, Streptopelis orientalis orientalis, Emberiza elegans elegans, and summer residents: Eurystomus orientalis abundus, Zoothera dauma toratugumi, Ninox scutulata scutulata.
Food samples were collected by placing the collar on nestlings, except for Brown Hawk -Owl which nested in a tree hollow. The results of food analysis were as follows:
Dendrocopos major hondoensis: Preferred foods were Noctuidae indet. 37.4% and Cimbicidae indet. 12.5%. The food included, insect larvae 78%, adult insects 9.36%, spiders 3.12%, Mollusca 3.12% and some amount of vegetable matter.
Parus major wladiwostokensis: Pine caterpillar, Dendrolimus 84.6% were the most important foods. They consumed insect larvae 97.94%, Lepidoptera 96.96%, Mollasca 1.18% and spider 1.18%.
Streptopelia orientalis orientalis: The foods supplied during the nesting period appeared to be vegetable matters only: red pepper seeds 85%, Soybean 11.25 and some grains.
Emberiza elegans elegans: Foods of Lepidoptera, Noctuidae indet., Gometridae indet. and Pachyligia dolosa.
Eurystomus orientalis abundus: They consumed adult insects only: Potosia aerata 30%, Oxycetonia jucunda 13.9%, Anomala viridana 11%, Dieranocephala adamsi 8.3%, and Platypeura kaempferi 11%. The most common food items were Coleoptera 75%, Potosia aerata 30%.
Zoothera dauma toratugumui: They consumed insect larvae 17%, adult insects 33% and and earthworms 50%.
Ninox scutulata scutulata: The owls forage mainly at night not far from the nest. The food samples found in their nest were only the Line-backed Field Mice, Apodemus agrarius, and Cicadas, Platypleura kaempferi. Both Mice and Cicadas appeared to be the most important foods.