환경생물 (Korean Journal of Environmental Biology)

  • 제20권2호
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  • Pages.180-188
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  • 2002
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  • 1226-9999(pISSN)
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  • 2287-7851(eISSN)
한국환경생물학회 (Korean Society of Environmental Biology)
권호 표지

구멍연잎성게, Astriclypeus manni(VERRIL 1867)의 먹이섭취, 서식밀도 및 이동속도에 관하여

Ecological Studies on the Sand Dollar, Astriclypeus manni (Verril 1867) - Feeding, Density and Locomotion

  • 강도형 (제주대학교 해양과학대학 해양생산과학부) ;
  • 최광식 (제주대학교 해양과학대학 해양생산과학부)
  • 발행 : 2002.06.01
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초록

부정형성게류인 구멍연잎성게는 제주도 연안에 널리 분포하고 있음에도 불구하고 생태학적 연구들이 미비한 실정이다. 이 연구는 구멍연잎성게의 행동학적 연구로서 먹이섭취, 서식밀도 및 이동에 대한 기초자료로서 시료는 제주도의 북동쪽에 위치한 함덕에서 SCUBA를 통하여 채집 및 현장에서 직접 관찰하였다. 장내용물 관찰 결과, 장내 퇴적물 입자의 평균 입도조성은 $77.6\pm{22.2}\mu{m}$였다. 장 내용물은 유공충, 저서성 요각류, 선충류, 규조류, 알, 해조류이 파편, 골편 등의 동식물 플랑크톤으로 구성되었다. 구멍연잎성게의 서식밀도는 $1m^2$ 당 0.4 개체이며, 분포패턴은 임의분포(random distribution)에 기초하는 것으로 판단되었다$(\chi^2=85.16,\;p>0.05)$. 구멍연잎성게의 이동거리는 여름철인 1998년 8월에 6.2-64.8cm $hr^{-1}(mean=25.0\pm{13.9)}$이었고, 5월에는 $2.0-43.0cm\;hr^{-1}(mean=17.7\pm{10.7)}$로 8월에 다소 높게 나타났다. 여름기간 중 관찰된 비교적 빠른 이동속도는 먹이 섭이 활동과 관련된 것으로 추정되었다.

Sand dollar, Astriclypeus manni (Echinodermata: Echinoidea) is widely distributed on subtidal sand flats all along the coast of Cheju Island. Limited information has been reported on their ecology despite their abundance. This study reports gut contents, density and locomotion of the sand dollars distributed on a subtidal sand flat on the north-east coast of Cheju Island. Microscopic examination of the gut contents indicated that A. manni feeds on inorganic and organic detritus as well as live organisms contained in the sediments. Inorganic particles included sand grains, sponge spicules and shells of benthic animals such as foraminifera, crustacean and molluscs. Mean diameter of sediment particles retained in the gut was $77.6\pm{22.2}\mu{m}$. Live organisms retained in the gut included foraminifera, harpacticoid copepods, nematodes, diatoms and unidentified egg. Spatial distribution pattern of the sand dollar was found to be random with a mean density of 0.4 individual $m^{-2}(\chi^2=85.16,\;p>0.05)$. Locomotion speed of the sand dollar measured in situ was 2.0 to 65.0 cm $hr^{-1}$. Locomotion speed and moving distance was somewhat higher in summer when food availability also higher.

키워드

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