Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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The different Polyphenism by the Level of Predation Risk and Habitat in Larval Salamander, Hynobius ieechii

한국산 도롱뇽의 포식압과 서식지에 따른 polyphenism

  • 황지희 (삼육대학교 대학원 생명산업학과 행동과학연구실) ;
  • 정훈 (삼육대학교 동물과학부)
  • Received : 2010.10.31
  • Accepted : 2010.12.22
  • Published : 2010.12.31
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Abstract

This study examined the different polyphenism of larval salamander Hynobius ieechii according to two habitats, pond and stream. We collected salamander's eggs from three regions including Mountain Inwang, Surak and Gwangju. Eggs were treated by four different conditions according to predation level and habitat: high risk - which had a predation risk three times a day; low risk - which had no predation risk, pond and stream habitat. Predation risk was conducted by using chemical cue from Chinese minnows. The chemical cue treatment started from the day of collection and ended one week after the hatching. After the treatment phase, we measured the head width at the level of the eyes(HWE) and the largest head width(LHW) and snout-vent length of the each larva. We calculated the ratio of the head size by dividing HWE by LHW and made a comparison with each of the average ratio of head size according to the predation risk. The results showed that there was a significant difference in the ratio of the head size and snout-vent length according to the predation risk and habitat. From these results we found that predation risk and habitat condition can cause the different polyphenism to the larval salamander and these morphological changes could be affect their mortality.

본 연구는 서식지와 포식압에 따라 머리 크기가 서로 다르게 나타나는 polyphenism에 대하여 한국산 도롱뇽 유생을 대상으로 이루어졌다. 인왕산과 수락산, 경기도 광주에서 채집해 온 도롱뇽의 알(난괴)을 서식지 특성과 포식압에 따라 4가지 그룹으로 나누었다. 서식지는 계곡 형과 웅덩이 형 두 그룹으로 나누었고, 포식압은 높음과 포식압 없음, 두 그룹으로 나누었다. 포식압 수준은 하루에 포식자의 cue에 노출된 빈도로 나누었으며 높은 수준은 하루 세 번으로 하였다. 포식 cue는 버들치의 냄새를 추출하여 사용하였고, 알 채집일 다음날부터 부화 후 일주일까지 cue에 노출시켰다. Chemical cue 노출 처리가 끝나는 부화 후 일주일이 되는 날, 각 도롱뇽 유생의 머리 중 가장 넓은 부분과 눈이 있는 부분의 길이, 그리고 snout-vent length를 측정하였다. 눈이 있는 부분의 길이는 머리 중 가장 넓은 부분으로 나눈 수치를 이용하여 통계 처리를 하였으며 결과는 다음과 같다. 도롱뇽 유생의 머리 크기 비율은 포식압의 수준이 높음에 따라 의미 있게 증가하였다. 또한 계곡형 서식지에 사는 도롱뇽 유생의 머리는 버들치의 cue에 반응하여 포식압이 높을 때 머리 크기 비율이 의미 있게 증가하지만, 웅덩이형 서식지에 사는 도롱뇽 유생은 무의미한 결과가 나타났다. 그리고 snout-vent length의 길이는 서식지와 상관없이 높은 포식압에서 증가하는 경향이 나타났다.

Keywords

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