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Web building strategy of a wasp spider, Argiope bruennichi, under sensory stimuli emitted by a cricket, Teleogryllus emma

왕귀뚜라미(Teleogryllus emma)감각 정보 제공에 따른 긴호랑거미(Argiope bruennichi)의 웹 건축 전략

  • 진우영 (인천대학교 자연과학대학 생명과학부) ;
  • 김길원 (인천대학교 자연과학대학 생명과학부)
  • Received : 2011.03.14
  • Accepted : 2011.04.26
  • Published : 2011.04.30

Abstract

Web structure of spiders is a foraging strategy as well as an investment to get prey. In order to make a good foraging decision spiders should change its foraging strategy in the basis of sensory information provided by potential prey species. We conducted experiments to demonstrate whether a wasp spider, Argiope bruennichi modifies its web-building behavior after experiencing sensory information emitted by a cricket species, Teleogryllus emma. To know how the web structures would be modified, we quantified web characteristics after providing sensory information of the cricket and compared to the control group. Web construction decreased in the course of the experiment in both, control group(without stimulus) and experimental group(with stimuli). The results did not show remarkable differences between two groups. However, on the first day after providing sensory information of the cricket, the web-building behavior of A. bruennichi decreased only in 3.7% of the experimental group individuals against 11.8% of the control group individuals. The number of the stabilimentum constructions decreased overall in both groups. On the first day the decreasing proportion was doubled in the control group(14.7%), comparing to the experimental group(7.4%). The individuals did not lower its web height and did not extend its web area according to sensory information of the prey.

거미의 웹 건축 행동은 먹이 사냥을 위한 투자 행동이며, 적극적인 포식 전략의 반영이다. 성공적인 포식전략 수립을 위해서 개체는 먹이 동물로부터 오는 감각 정보를 반영해야 할 것이다. 본 연구는 우리나라에 널리 분포하는 대표적 논거미인 긴호랑거미(Argiope bruennichi)의 건축 행동이 피식자인 왕귀뚜라미(Teleogryllus emma)에 의해 제공되는 감각 정보를 바탕으로 수정되는가를 알아보기 위해 수행되었다. 웹의 물리적 구조가 수정되는 양상을 보기 위해 감각 자극 전과 후에 건축된 웹의 구조를 정량적으로 측정하고 대조군과 비교 분석하였다. 먹이가 공급되지 않는 상황에서 웹 건축 행동을 보인 개체의 수는 대조군(자극 없음)과 실험군(자극 공급)에서 모두 감소하는 경향을 보였다. 대조군과 실험군에서 나타난 증감 양상이 뚜렷한 차이를 드러내 않았다. 왕귀뚜라미에 의한 자극 공급 1일째에 해당하는 날에 실험군 웹 건축 행동은 전일 대비 3.7% 감소한대 반해 대조군은 11.8% 감소하는 차이를 나타냈다. 흰띠줄 건축 행동 역시 전반적으로 감소하는 경향이 나타났다. 대조군에서 흰띠줄을 건축한 개체수가 자극 1일에 14.7% 감소한데 비해, 실험군에서는 7.4%로 두 배 가량 감소 경향이 낮게 나타났다. 본 실험 디자인에 의한 연구 결과는 개체가 감각 정보에 따라 웹의 높이와 넓이를 수정하지 않는 것으로 나타났다.

Keywords

References

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