Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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The Different Growth Rate by Predation Risk in Larval Salamander, Hynobius leechii

한국산 도롱뇽의 포식압 유, 무에 따른 성장률의 변화

  • Hwang, Ji-Hee (Department of Animal Science, Sahmyook Universiy) ;
  • Chung, Hoon (Department of Animal Science, Sahmyook Universiy)
  • 황지희 (삼육대학교 동물과학부) ;
  • 정훈 (삼육대학교 동물과학부)
  • Received : 2011.05.31
  • Accepted : 2011.10.06
  • Published : 2011.10.31
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Abstract

This study examined the different growth rate of larval salamander Hynobius leechii by the predation risk. We collected salamander's eggs from Mountain Inwang. Eggs were treated by two different conditions: (1) cue - which had a predation risk three times a day; (2) no cue - which had no predation risk. Predation risk was conducted by using chemical cue from Chinese minnows. The chemical cue treatment started from the next day after the collection and ended one week after the hatching. Between the first week and the second week after the hatching we fed salamander larvae with tubifex ad. libitium. After the treatment phase, we measured snout - vent length of the each larva on the first week and the second week after the hatching. The results showed that there was a significant difference in the growth rate by the predation risk. From these results we found that predation risk can cause the different growth rate to the larval salamander and these changes could be affect their mortality.

본 연구는 포식압에 따라 서로 다르게 나타나는 성장률에 대하여 한국산 도롱뇽 유생을 대상으로 이루어졌다. 인왕산에서 채집해온 도롱뇽의 알(난괴)을 포식압 유, 무에 따라 두 그룹으로 나누었다. 포식자 cue로는 버들치의 체취를 이용하였고, 포식압이 존재하는 그룹은 하루 세 번 포식자의 cue에 노출되도록 하였다. 포식자 cue 처리는 알 채집일 다음 날부터 부화 후 1주일까지 하였고, 이후 각 유생의 snout-vent length를 버니어 캘리퍼를 이용하여 측정하였다. 부화 후 1주일부터 2주일 사이의 기간 동안 각 그룹의 유생에게 충분한 양의 실지렁이를 먹이로 제공하였고, 남은 먹이는 제거하였다. 부화 후 2주일이 되는 날 각 유생의 snout-vent length를 다시 한 번 측정 한 후, 각 개체의 성장률을 계산하여 데이터 분석을 하였다. 그 결과 포식자 cue처리를 한 그룹은 그렇지 않은 그룹보다 낮은 성장률을 보였으며, 사망률 또한 높은 것으로 나타났다.

Keywords

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