노란잔산잠자리(멸종위기야생생물 II급) 약충은 내성천 일대 서식하는 것으로 알려져 있다. 2019년 3월 서식이 확인된 37개 지점의 하상 0.2㎡ 면적에서 채취한 퇴적물 입도 분석 및 개체수와의 상관관계를 분석하였다. 입도 분석 결과 ‘조립사’(500 ~ 1,000 ㎛) 52.5%, ‘극조립 사’(1,000 ~ 2,000 ㎛) 25.6%, ‘중립사’ (250 ~ 500 ㎛) 17.2%, ‘세립사’(125 ~ 250 ㎛) 3.1%, ‘극세립사’(63 ~ 125 ㎛) 1.0%, ‘실트’(63 ㎛미 만) 0.7% 순으로 나타났다. 노란잔산잠자리 약충의 개체수는 ‘극세립사’(63 ~ 125 ㎛), ‘세립사’(125 ~ 250 ㎛)와는 양의 상관관계를, ‘조립사’ (500 ~ 1.000 ㎛)와는 음의 상관관계를 나타내었다. 본 연구 결과를 통해 노란잔산잠자리 약충이 고운 모래를 서식처로 활용하고 있는 것을 확인 하였으며, 이러한 연구결과는 이후 내성천 일대 하상 환경변화 모니터링에 활용 할 수 있을 것이다.

The oedemerid species Oedemera sexualis Marseul, 1877 is reported for the first time from Korea. The genus Oedemera Olivier, 1789, within subfamily Oedemerinae and family Oedemeridae, is one of the common oedemerid beetles being widely distributed throughout the world. The world-widespread genus Oedemera is presented 3 subgenera and 104 species in Palaearctic region. Until now, 8 species and subspecies were recorded in Korea. O. sexualis was found in Is. Yongcho and Is. Bijin in Tongyeong-si, Gyeongsangnamdo of Korea, bringing the number of Korean Oedemera species to 9 species. In this study, we report the taxonomic key to the genus Oedemera of Korea, and morphological description of O. sexualis.

We studied the inhabited environment of aquatic lampylid species, Luciola lateralis, in Andong-si (rice paddy type), Bonghwa-gun (rice paddy type) and Cheongsong-gun (stream type) from 2010 to 2012. Totally, 5 species (Gabbia misella, Semisulcospira libertina, Radix auricularia, Physa acuta, and Hippeutis cantori) in rice paddy habitats, and 4 species (S. libertina, S. forticosta, R. auricularia, and H. cantori) in stream habitats can be edible by larval L. lateralis. We selected 2 species, S. libertina and P. acuta which can be the main food resources for larval L. lateralis in paddy and stream habitats, and individually reared the L. lateralis larvae with each other edible species. After the individual rearing, we analyzed the head sizes of each larval exuviae. There is no significant difference in the 1st instar larval size (P>0.05) between the kind of provided feed (S. libertina and P. acuta). In case of 2nd instar larvae, the head size was bigger when P. acuta was provided as the feed (P<0.05). In case of 3rd and 4th instar larvae, the head size was bigger when S. libertina was provided as the feed (P<0.05). In the analysis of size of L. larteralis adult according to inhabited environment, the adult size was found to be bigger at stream type environment than rice paddy type (P<0.01).