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

The Korean Society of Oceanography (한국해양학회)
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Survival Rates of Larval Abalone by Direct Attack of Pfiesteria and Pfiesteria-like Species

피스테리아와 피스테리아 유사종의 전복 유생 섭식 특성과 생존을 연구

  • Kim, Jae-Seong (Red-tide Research Center, Kunsan National University) ;
  • Lee, Chang-Won (Department of oceanography, Kunsan National University) ;
  • Lee, Hee-Mahn (Department of oceanography, Kunsan National University) ;
  • Jeong, Hae-Jin (Department of oceanography, Seoul National University)
  • Published : 2009.08.31
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Abstract

To investigate the difference in the ecological niches between Pfiesteria piscicida and Pfiesteria-like species (Cryptoperidininopsis brodyi and Stoeckeria algicida), we have observed the feeding behavior of three potential predators on abalone larvae and measured the survival rates of abalone larvae as a function of initial predator concentration. When the predators were mixed with abalone larvae, P. piscicida and C. brodyi became active and exhibited attacking behavior on abalone larvae within a few seconds. They could ingest whole soft body of abalone larvae using a peduncle. In contrast, feeding and attacking behavior were not observed from S. algicida. Survival rates in abalone larvae decreased with an increase of the initial concentration of P. piscicida and C. brodyi. These results indicate that Pfiesteria and Pfiesteria-like species displaying the very same shape and size have different ecological niche in the marine food webs, which implies that identification to species level is definitely important to understand and discriminate the ecological roles of them.

종속영양 와편의류인 Pfiesteria 종과 이와 유사한 형태의 Pfiesteria-like 종간의 생태적 지위차를 확인하기 위해, Pfiesteria piscicida, Cryptoperidininopsis brodyi, Stoeckeria algicida 3종에 전복유생(abalone larvae)을 투입하여 그들의 섭식 여부를 확인하고, 이들의 농도변화에 따른 전복 유생의 생존율 변화를 확인하였다. P. piscicida와 C. brodyi는 부화 1일차의 전복 유생을 직접 공격하여 치사 시킨 후 peduncle이라는 섭식기관을 이용하여 개체 전체를 섭식하는 것으로 밝혀졌다. 하지만 형태적으로 이들과 매우 유사하고 peduncle도 가진 S. algicida는 전복 유생을 직접 공격하거나 섭식하지 않았다. 전복 유생의 생존율은 P. piscicida와 C. brodyi의 초기 투입농도가 증가함에 따라 상대적으로 낮아졌다. 이러한 결과는 형태적으로 매우 유사한 종속영양성 와편모류일지라도 그들이 가지는 생태적지위는 매우 다르며, 보다 명확한 해양 생태계 먹이사슬을 이해하기 위해서는 종(species) 수준의 명확한 종 동정연구가 필요함을 제시해 준다.

Keywords

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