The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Distribution of the Seagrass, Zostera spp. in Ulleungdo

울릉도 연안의 거머리말속 잘피 분포

  • 박정임 (해양생태기술연구소 기업부설연구소) ;
  • 김재훈 (해양생태기술연구소) ;
  • 송휘준 (부산대학교 생명과학과) ;
  • 김구연 (경남대학교 과학교육과)
  • Received : 2020.07.17
  • Accepted : 2020.09.23
  • Published : 2020.11.30
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Abstract

To examine distribution of the Zostera species growing naturally in Ulleungdo, scuba diving surveys using ships were conducted along the coast and inside the harbors of the island at the end of September 2019. In areas of seagrass occurrence, environmental factors such as nutrient concentrations in water column and sediment pore water, salinity, and sediment organic content were also analyzed. Zostera caulescens meadows appeared in the relatively deep waters (14-24 m MSL) of Cheonbu-ri, Jeodong-ri, Sadong-ri, and Namyang-ri in Ulleungdo, and the total seagrass coverage was approximately 4.9 ha. Approximately 0.9 ha of Zostera marina meadow was found at the depths of 3-5 m MSL within Hyeonpo-hang in Hyeonpo-ri. The average shoot density and biomass of Z. caulescens were 121.9±9.7 shoot m-2 and 99.0±13.2 gDW m-2, respectively, with no significant differences by location. The average shoot density and biomass of Z. marina were 193.8±18.8 shoot m-2 and 102.6±6.8 gDW m-2, respectively. The nutrient concentrations in the sediment pore water and sediment organic content in the seagrass meadows in Ulleungdo were lower than those in eelgrass meadows on the southern and eastern coasts of Korea. These results will provide useful basic information for the marine protected species, Z. caulescens and Z. marina, and for the conservation of the waters of Ulleungdo, which has been designated as a marine protected area.

울릉도에 자생하는 거머리말속 잘피 분포 현황을 밝히기 위해 2019년 9월말 울릉도 연안과 항내에서 선박을 이용하여 잠수조사를 하였다. 잘피 생육 환경을 조사하기 위해 잘피가 서식하는 장소의 해수와 퇴적물 공극수의 영양염 농도, 염분 및 퇴적물의 유기물 함량을 분석하였다. 울릉도 천부리, 저동리, 사동리와 남양리 연안에는 비교적 깊은 수심(14~24 m)에서 수거머리말 군락지가 관찰되었고, 총 생육면적은 약 4.9 ha이었다. 현포리 현포항내에는 3~5 m의 수심에서 생육면적 약 0.9 ha의 거머리말이 서식하고 있는 것으로 나타났다. 수거머리말의 평균 생육밀도와 생체량은 각각 121.9±9.7 shoot m-2와 99.0±13.2 gDW m-2로 서식지별로 유의한 차이가 나타나지 않았고, 거머리말의 생육밀도와 생체량은 각각 193.8±18.8 shoot m-2와 102.6±6.8 gDW m-2로 나타났다. 울릉도의 수거머리말과 거머리말 군락지 퇴적물의 영양염 농도와 퇴적물 유기물 함량은 남해안과 동해안의 잘피군락지보다 낮은 값을 보였다. 본 연구결과는 울릉도 연안의 거머리말속 잘피 현황을 최초로 보고하며, 해양보호구역으로 지정된 울릉도 해역의 보존과 해양보호생물인 수거머리말과 거머리말 보호에 유용한 기초자료를 제공할 것이다.

Keywords

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