壱岐水道の小二神島で発見されたカンムリウミスズメ集団繁殖地の規模

抄録

The Japanese Murrelet Synthliboramphus wumizusume is a vulnerable seabird species that breeds only along the coastal regions of Japan and South Korea. Some breeding islets have been identified off the coast of northern Kyushu, but many others remain uninvestigated. In this study, we conducted nocturnal spotlight surveys around Kofutagamijima Island in the Ikisuido Strait, Nagasaki, Japan, where a fledgling, eggshells and cranial bones of the Japanese Murrelet had been recently found. We observed 134 individuals and heard 103 calls during the surveys, indicating the likely presence of a breeding colony at Kofutagamijima Island. The colony size was estimated to be greater than any other colonies in northern Kyushu.