Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Ontogenetic Color Variation of Abudefduf notatus (Pomacentridae: Perciformes) Revealed by 16S rRNA Sequences Analysis

미토콘드리아 16S rRNA 염기서열 분석에 의해 밝혀진 동갈자돔 치어의 성장에 따른 체색변이

  • Song, Young Sun (Department of Marine Biology, Pukyong National University) ;
  • Kim, Jin-Koo (Department of Marine Biology, Pukyong National University)
  • 송영선 (부경대학교 자원생물학과) ;
  • 김진구 (부경대학교 자원생물학과)
  • Received : 2013.06.03
  • Accepted : 2013.06.27
  • Published : 2013.06.30
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Abstract

Seven individuals (16.1~29.1 mm in length) which were estimated with fishes of genus Abudefduf were collected in Seogwipo, Jeju Island in the summer of 2011 and 2012. Among them, five individuals (20.8~29.1 mm SL) are similar to Abudefduf notatus, based on morphological characters such as yellow transverse band on the body, one small black spot on the base of the pectoral fin, and yellow caudal fin. On the other hand, two individuals (16.1 mm, 17.0 mm SL) differ from them in several light transverse bands and transparent rays of all fins except for pelvic fin, and anterior transparent head with only one (16.1 mm). According to the results of molecular analyses of 578 base pairs of mtDNA 16S rRNA sequences, these individuals correspond to A. notatus adult, with a high bootstrap value of 95% (genetic distance, d=0.002). Therefore, this study shows that the individuals more than 20.8 mm similar to adult body color but the 16.1 mm individual differs to that of adult. We confirm that this species changes to body color during their early life stages. This result regards as a survival strategy to protect themselves against their predator during their early life stages.

2011년과 2012년 하계에 제주도 서귀포에서 줄자돔속 어류로 추정되는 치어 7개체(체장 16.1~29.1 mm)가 채집되었다. 그중 5개체(체장 20.8~29.1 mm)는 몸 중앙에 황색의 뚜렷한 가로줄무늬와 가슴지느러미 기저에 작은 검은색 반점이 1개 있고 꼬리지느러미가 노란색을 띠는 점에서 동갈자돔(Abudefduf notatus)과 유사하였다. 그러나, 상대적으로 크기가 작은 2개체(체장 16.1 mm, 17.0 mm)는 다열의 밝은 가로줄무늬가 있고 두부의 앞쪽과 배지느러미를 제외한 모든 지느러미 연조부가 투명한 점에서 앞서 5개체와 차이를 보였다. 미토콘드리아 16S rRNA 영역 578bp를 분석한 결과, 본 개체는 동갈자돔 성어와 95% bootstrap 값으로 일치하였다(genetic distance, d=0.002). 따라서, 본 연구를 통해 동갈자돔 치어 중 20.8 mm 이상 개체는 성어와 유사한 체색을 나타내었으나 그보다 작은 16.1 mm개체에서는 성어와 다른 체색을 보여 본 종은 어린 시기에 체색이 변하는 것을 확인할 수 있었다. 이는 이들이 어린 시기에 포식자로부터 자신을 방어하기 위한 생존전략으로 사료된다

Keywords

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