Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Habitat Environments and Spatiotemporal Distribution of Clithon retropictum at the Estuaries of Bonggang and Miryoung Streams in the Southern Coast of Korea

남해안 봉강천과 미룡천 하구에서 기수갈고둥의 분포 및 서식지 환경 특성

  • Jang, Keon Gang (Faculty of Marine Applied Biosciences, College of Ocean Science and Engineering, Kunsan National University) ;
  • Kim, Min-Seop (Department of Taxonomy and Systematics, National Marine Biodiversity Institute of Korea) ;
  • Jo, Soo-Gun (Faculty of Marine Applied Biosciences, College of Ocean Science and Engineering, Kunsan National University) ;
  • Yih, Wonho (Faculty of Marine Applied Biosciences, College of Ocean Science and Engineering, Kunsan National University) ;
  • Kim, Hyung Seop (Faculty of Marine Applied Biosciences, College of Ocean Science and Engineering, Kunsan National University)
  • 장건강 (군산대학교 해양과학대학 해양생명응용과학부) ;
  • 김민섭 (국립해양생물자원관 해양생물연구본부) ;
  • 조수근 (군산대학교 해양과학대학 해양생명응용과학부) ;
  • 이원호 (군산대학교 해양과학대학 해양생명응용과학부) ;
  • 김형섭 (군산대학교 해양과학대학 해양생명응용과학부)
  • Received : 2021.06.15
  • Accepted : 2021.07.12
  • Published : 2021.09.30
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Abstract

At the estuaries of Bonggang and Miryong streams in the Korean southern coast, the spatiotemporal distribution and habitat environment of a nerite snail, Clithon retropictum (Gastropoda: Neritidae), which has been assigned as a legally protected species of Korea, were explored. Physicochemical environmental factors such as water temperature, salinity, tidal level distribution as well as biotic environments (chlorophyll-a concentration and epilithic microalgae composition) were monitored every month. The relationships between the environmental factors and spatiotemporal distribution of the nerite snail population were analyzed. Water temperature, salinity, and water level varied by season and lunar tidal rhythm. The spatiotemporal distribution of the nerite snail was mostly related to water salinity. Among epilithic algae which were the priority prey of snails, blue-green algae and green algae dominated in summer and autumn, while diatoms predominated during winter and spring. Chlorophyll-a concentration was highly and positively correlated with the population density of the nerite snail. The correlation coefficients were different depending on the taxon (Family) of epilithic algae. The mean population density was 302.2 inds m-2 and 271.8 inds m-2 in Bonggang Stream and Miryong Stream, respectively. The egg capsules of the nerite snail in the two habitats were observed from March (in Bonggang Stream) or April (in Miryong Stream) to August, and newly hatched juveniles recruited in the habitats from August were assessed with regard to frequency distributions of shell width. The occurrence of large-sized snails in upper stream reaches of both Bonggang and Miryong indicated the movement of spats from the mouth to the upper reaches during the whole life cycle.

Keywords

Acknowledgement

본 연구는 해양수산부의 재원으로 해양생태계 서식처 기능 개선 및 복원사업(국립해양생물자원관, MABIK-2021E00400)과 한국해양과학기술진흥원 해양수산기술지역 특성화사업(전북씨그랜트 프로그램, KIMST-20170353)의 지원을 받아 수행된 연구입니다.

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