초록

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이 연구는 제주도 함덕연안에 분포하는 구멍연잎성게의 생태 및 번식생활사에 관한 연구보고서이다. 시료는 북제주군 함덕에서 SCUBA를 통하여 채집하였으며, 실험실로 옮긴 뒤, 크기 및 생식소에 대한 분석을 수행하였다. 구멍연잎성게의 크기는 각장 80$\~$200mm 이었으며, 각장 140$\~$170mm 의 개체가 주를 이루었다 (N=129). 구멍연잎성게는 세립질 또는 미립질 ($125\~250\mu$m ($2\~3\phi$))의 사질에 주로 분포하였으며, 퇴적물내의 유기물을 섭취하는 퇴적물식자로 확인되었다. 성숙한 암컷의 생식소는 보라색을 띠며, 수컷은 짙은 노란색을 띤다. 암, 수 모두 11$\~$3월 사이 휴지기를 거쳐 6월경에 성숙하며, 주 방란 방정은 7$\~$10월 사이에 이루어진 것으로 추정된다. 암컷의 경우 성숙한 난은 그 직경이 평균 381$\mu$m이었다.

Abstract ▼ AI-Helper

The sand dollar, Astriclypeus manni is commonly encountered on a subtidal sand bottom along the coast of Cheju Island. limited information has been reported on their ecology despite their natural abundance. This study reports ecology and an annual reproductive cycle of the sand dollars present at Ha...

The sand dollar, Astriclypeus manni is commonly encountered on a subtidal sand bottom along the coast of Cheju Island. limited information has been reported on their ecology despite their natural abundance. This study reports ecology and an annual reproductive cycle of the sand dollars present at Hamdock, northern coast of Cheju Island. A. manni collected from Hamdock revealed that they are 80 to 200 mm in test diameter. Sediment Brain size analysis indicated that A. manni mostly occurs on medium (particle diameter of 500 $\mu$m) to very find sand (particle diameter of 125 $\mu$m), particularly on fine sand (particle diameter of 250 $\mu$m). Internal morphology and in situ observations on their feeding habit indicated that A. manni is a deposit feeder, feeding on organic debris contained in the sediment around its habitat. A. manni were more frequently observed near Zostrea marina bed where content of organic matter in the sediment is considered to be higher. Gonadal tissues of the male were yellow in color while female gonads appeared to be purple. Fully mature eggs, with a mean diameter of 381 $\mu$m, and sperm were observed from the histological slides of the sand dollars collected in late July to August, suggesting that A. manni spawn during July to August when water temperature reaches 20 to $25^{\circ}C$.

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