Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Histologic and Microstructural Analyses on Postembryonic Development in the Wolf Spider Arctosa kwangreungensis (Araneae: Lycosidae)

광릉늑대거미 (Arctosa kwangreungensis) 배후발생과정의 조직 미세구조 분석

  • 양성찬 (단국대학교 생명과학과) ;
  • 문명진 (단국대학교 생명과학과)
  • Received : 2012.02.15
  • Accepted : 2012.03.26
  • Published : 2012.03.31
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Abstract

Histologic and microstructural changes during the postembryonic development of the wolf spider Arctosa kwangreungensis were studied using light and scanning electron microscopy to examine the relationship between a morphological differentiation and behavioral properties. The postembryo with abdominal yolk sac was stayed inactive in the egg case because its muscular and visual systems were not fully developed to a functional level. The first instar spiderlings, developed from the postembryo by a first molting process, started to exhibit its pigmentation on their body cuticles. In particular, undifferentiated cell clusters of central nervous system (CNS) were densely distributed within the cephalothorax, and highly differentiated abdominal ganglion was observed. They had a characteristic visual system looks more like its adult counterpart, and had segmented appendages looks more like the tiny spiders containing well oriented muscular system. After 3rd instar, spiderlings grew more rapidly with accordance to their consistent growth and periodical molting processes. Thus, the relative area of CNS with respect to cephalothorax was gradually decreased, instead a pair of venom glands, musculature, and connectives occupied the residual area. It has been revealed that the early development of spider can be controled by the feeding condition of larval period, since histologic and microstructural differentiations in both appendages and optic system were completed at the second instar. In particular, behavioral properties of the wandering spiders that depend on vision and their running ability were deeply related to physiological differentiation of the microstructural development.

배회성거미류의 배후발생과정에서 형태적 분화가 행동학적 특성으로 발현되는 기전을 규명하기 위하여 광릉늑대거미(Arctosa kwangreungensis) 후기배아와 각 발생 단계의 유충을 실험재료로 그 조직학적 및 미세구조적 변화를 광학 및 주사전자현미경으로 분석하였다. 난황주머니를 가진 후기배아는 부속지의 근육조직과 신경절의 미분화로 비활성상태를 유지하며, 시각기의 신경절과 신경의 발달도 미약하였다. 제1령 유충의 두흉부에서는 미분화된 세포집단이 관찰되고 체색의 발현과 복부신경절의 분화가 현저하였다. 먹이 활동을 시작하는 제2령 유충의 중추신경계에는 신경섬유가 급격히 증가되었고, 성체와 유사한 부속지의 분절구조와 시각기의 조직학적 체제가 확립되었다. 제3령 이후의 유충들은 탈피를 거듭하여 두흉부에서 중추신경계가 차지하는 영역이 축소되었고 독선과 근육조직, 그리고 결합조직등의 활발한 분화가 진행되었다. 먹이활동을 시작하는 제2령 유충 단계에서 부속지와 시각기의 조직학적 발생과 이를 통제하는 신경계의 분화가 완료되는 것으로 미루어, 섭식환경이 배후발생과정을 조절할 수 있으며, 특히 시각과 부속지에 의존하여 먹이를 포획하는 배회성거미류의 행동 습성이 형태조직학적 분화와 연관되어 있음을 확인할 수 있었다.

Keywords

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