2015년 6월에 관측된 울릉 난수성 소용돌이 특징

울릉도, 독도 주변 해역의 상층 해양환경 변동 특성 연구 일환으로 울릉도 주변 해역의 중심으로 발달된 울릉 난수성 소용돌이의 특성을 조사하기 위해 2015년 6월 9일 - 10일에 걸쳐 동해연안에서 울릉도와 독도를 가로지르는 단면에 대하여 수심 약 500m 이내에서 수심별 수온, 염분, 용존산소, 클로로필 분포 등을 CTD 911plus를 사용하여 조사하였다. 현장조사를 통해 울릉도에 중심을 둔 직경 약 150km 규모의 울릉 난수성 소용돌이가 발달해 있으며, 소용돌이 중앙부에서 수온 10℃ 내외로 해수물성이 매우 일정한 thermostad 층은 50-250m 사이에서 발달해 있음을 확인할 수 있었다. 이 난수성 소용돌이는 2014년 12월에 발생이 보고된 이래 2015년 9월까지도 유지되고 있는 것으로 고려된다.내에서 수심별 수온, 염분, 용존산소, 클로로필 분포 등을 CTD 911plus를 사용하여 조사하였다. 현장조사를 통해 울릉도에 중심을 둔 직경 약 150km 규모의 울릉 난수성 소용돌이가 발달해 있으며, 소용돌이 중앙부에서 수온 10℃ 내외로 해수물성이 매우 일정한 thermostad 층은 50-250m 사이에서 발달해 있음을 확인할 수 있었다. 이 난수성 소용돌이는 2014년 12월에 발생이 보고된 이래 2015년 9월까지도 유지되고 있는 것으로 고려된다.2

Annual reproductive cycle of mussle, Mytilus coruscus (Gould, 1861) on the east coast of Ulleungdo Island in the East Sea of Korea

Gametogenesis of the mussle Mytilus coruscus (Gould, 1861) on the east coast of Ulleungdo Island, Korea was investigated monthly (May 2013 to May 2014). Gametogenesis in females and males in September when the water temperature reached 23.7°C. Ripe gametes were observed from December 2013 to May 2014 in both sexes. First spawning males and females were observed in March (10.2°C) and April (12.6°C) as the lowest surface water temperature during the sampling periods. Partially spawned mussles were evident from March to July and April to July in male and female, respectively, when the water temperature increasing period ranged 10.2-23.2°C. Most mussles collected in April and May exhibited partially empty follicles with large eggs, suggesting that these two months are the major spawning periods. From June to September, most of the mussles were in spent and resting stages. In contrast, all male and female mussles were in resting stage exhibiting no gametes in the follicles in August. Our data suggested that M. coruscus is a winter spawner, and their annual gametogenesis is closely associated with the seasonal variation in the surface water temperature. Resting phase of the male and female mussles from June to October and such prolonged period of resting could be, in part, explainable by poor food condition in the study site. The present study first provided fundamental information on life history of M. coruscus, which°C. Ripe gametes were observed from December 2013 to May 2014 in both sexes. First spawning males and females were observed in March (10.2°C) and April (12.6°C) as the lowest surface water temperature during the sampling periods. Partially spawned mussles were evident from March to July and April to July in male and female, respectively, when the water temperature increasing period ranged 10.2-23.2°C. Most mussles collected in April and May exhibited partially empty follicles with large eggs, suggesting that these two months are the major spawning periods. From June to September, most of the mussles were in spent and resting stages. In contrast, all male and female mussles were in resting stage exhibiting no gametes in the follicles in August. Our data suggested that M. coruscus is a winter spawner, and their annual gametogenesis is closely associated with the seasonal variation in the surface water temperature. Resting phase of the male and female mussles from June to October and such prolonged period of resting could be, in part, explainable by poor food condition in the study site. The present study first provided fundamental information on life history of M. coruscus, which1

대형해양동물 증식복원사업 기획연구

한국해양과학기술

Marine Ecosystem Responses to Climate Variability and Artificial disturbances in Ulleungdo

한국해양과학기술

Development of risk assessment for control technology to reduce transfer of ships'biofouling:In-water cleaning technique

한국해양과학기술

Development of risk assessment for control technology to reduce transfer of ship's biofouling: In-water cleaning technique

한국해양과학기술

중규모 해양 과정과 생태계 반응 연구: 남해역(남해 및 동중국해)[최종보고서]

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