Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Polyphenism by the level of predation risk in larval salamander, Hynobius leechii

포식압 수준에 따른 한국산 도롱뇽 유생의 표현형의 변화

  • Hwnag, Jihee (Department of Convergence Science, Sahmyook University) ;
  • Kim, Eun-Ji (Department of Convergence Science, Sahmyook University) ;
  • Kim, Ho-Jin (Department of Convergence Science, Sahmyook University) ;
  • Chung, Hoon (Department of Annimal resource, Sahmyook University)
  • 황지희 (삼육대학교 대학원 융합과학과 행동과학연구실) ;
  • 김은지 (삼육대학교 대학원 융합과학과 행동과학연구실) ;
  • 김호진 (삼육대학교 대학원 융합과학과 행동과학연구실) ;
  • 정훈 (삼육대학교 동물자원학과)
  • Received : 2013.04.18
  • Accepted : 2013.08.09
  • Published : 2013.11.30
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Abstract

This study examined the cannibalistic polyphenism of larval salamander Hynobius leechii by the level of predation risk. Salamander eggs were collected from three regions (Mountain Inwang, Mountain Surak and Gwangju). Eggs were treated by three different risk conditions: (1) high risk, predation risk three times a day; (2) medium risk, predation risk once a day; and (3) low risk, no predation risk. Predation risk was conducted using a chemical cue from Chinese minnows. The chemical cue treatment started from the day of collection and ended one week after hatching. Post-treatment measurements were head width at the level of the eyes (HWE), largest head width (LHW), and Snout-vent length of the each larva. To compare the morphological change according to the predation risk, we modified the two head size, HWE and LHW, to HWE/LHW. A significant difference in HWE/LHW and snout-vent length was evident according to the level of predation risk. And larval mortality was increase by the predation risk. The results indicate that predation risk can cause cannibalistic polyphenism of larval salamander and this morphological change could influence larval mortality.

본 연구는 한국산 도롱뇽 유생(Hynobius leechii)을 대상으로 포식압의 수준이 카니발리즘적 폴리페니즘에 영향을 미치는지 알아보기 위하여 수행되었다. 버들치의 냄새를 포식자 신호로 이용하여 (1) 높은 포식압- 하루 세 번의 포식압 (2) 중간 포식압- 하루 한 번의 포식압 (3) 포식압 없음 세 그룹으로 나누어 채집일로부터 부화 후 일주일까지 처리하였다. 먹이섭취로 인한 형태적 변화를 막기 위하여 실험은 기아상태에서 진행되었으며, 도롱뇽 유생은 경기도 광주, 인왕산, 수락산에서 채집된 난괴를 이용하였다. 포식압 처리 이후 도롱뇽 유생의 머리 중 가장 넓은 곳의 길이(LHW), 눈이 있는 부분의 머리길이(HWE). 그리고 코 끝부터 항문(SVL)까지의 길이를 측정하였다. 카니발리즘적 폴리페니즘의 측정은 HWE를 LHW로 나눈 수치(HWE/LHW)를 이용하여 통계처리를 하였고, 그 결과 포식압 수준이 증가함에 따라 HWE/LHW와 SVL이 유의미하게 증가하는 것을 볼 수 있었다. 또한 각 포압에 따른 사망률을 조사하여 본 결과 포식압 수준에 따른 증가를 보여, 카니발리즘적 폴리페니즘은 매우 에너지 소모적인 것으로 볼 수 있었다. 이러한 결과를 통하여 도롱뇽유생은 한정적 자원을 가진 환경에서 포식압에 의하여 카니발리즘을 일으키기 유리한 형태로 변화할 수 있다는 것을 알 수 있었다.

Keywords

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