Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Web Structure of the Wasp Spider, Argiope bruennichi, Depending on Micro-Habitat Characteristics

미소서식지 특성에 따른 긴호랑거미 (Argiope bruennichi)의 웹 구조 분석

  • 김길원 (인천대학교 자연과학대학 생명과학부) ;
  • 김덕래 (인천대학교 자연과학대학 생명과학부) ;
  • 진우영 (인천대학교 자연과학대학 생명과학부)
  • Received : 2010.03.02
  • Accepted : 2010.04.28
  • Published : 2010.04.30
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Abstract

Web building of the spider is an investment behavior for prey foraging with genetic constraint. Individual's decision-making on the web construction depends on diverse environmental variables. This study investigated web structure of the wasp spider, Argiope bruennichi, to compare individual's behaviors in dry field and in wet field. We measured 35 web structures in dry field (Chunma-San, Incheon) showing relatively low humidity (46.4%) and luxuriant herbage, and 13 web structures in the wet rice field (73.9%; Taean-Gun, Chungnam). Comparing to the wet field the individuals in the dry field invested significantly more silk: $32.5{\pm}12.8$ number of silk spirals used in the dry field vs. $16.9{\pm}5.4$ in the wet field. The web area of the dry field was greater than that of the wet field: $976{\pm}643cm^2$ vs. $532{\pm}254cm^2$. The web height, distance between the ground and the center of the web, appeared higher in the dry field than in the wet field: $71.4{\pm}39.6cm$ vs. $49.6{\pm}31.2cm$. Also the web constructed in the dry field showed longer stabilimentum than the web of the wet field: $18.8{\pm}3.4cm$ vs. $3.9{\pm}3.2cm$. The perpendicular inclination and the inclination to East-West of the web showed no difference between the two fields. This study suggests that adult females of A. bruennichi could modulate its construction behavior depending on the micro-habitat factors.

거미의 건축행동은 유전적 요인의 제한을 받지만 서식지의 다양한 환경 요인을 반영하는 먹이 사냥을 위한 투자 행동이며, 능동적인 의사결정의 반영이다. 본 연구는 긴호랑거미(Argiope bruennichi)를 대상으로 나대지 ('dry field')와 논습지('wet field')에 서식하는 개체가 건축한 웹의 물리적 구조를 정량적으로 측정 비교하였다. 습도 46.4%인 나대지(인천시 천마산)에서 35개체, 습도 73.9%의 논습지(충남 태안군)에서 13개체의 웹 구조가 분석되었다. 상대적으로 습도가 낮고 초본이 우거진 나대지 환경에 건축하는 개체의 경우 논습지 환경과 비교해 더 많은 거미실을 투자해($32.5{\pm}12.8$ vs. $16.9{\pm}5.4$ 개의 나선실 사용), 더 넓은 웹을 건축하였다($976{\pm}643cm^2$ vs. $532{\pm}254cm^2$). 또한 나대지에 서식하는 개체가 논습지 개체에 비해 더 높은 웹을 건축하는 것으로 나타났다($71.4{\pm}39.6cm$ vs. $49.6{\pm}31.2cm$). 흰띠줄 건축행동을 측정한 결과 나대지의 개체가 상대적으로 큰 흰띠줄을 건축하는 것으로 나타났다($18.8{\pm}3.4cm$ vs. $3.9{\pm}3.2cm$). 웹의 기울기를 측정한 수직경사와 동서경사의 경우 나대지와 논습지에서 유의미한 차이를 보이지 않았다. 본 연구 결과는 성체 암컷 긴호랑거미가 환경 요인에 따라 건축행동을 변화시킬 수 있다는 것을 시사한다

Keywords

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