Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Seasonal Change of Skin Mucus Cells of Misgurnus mizolepis (Cobitidae) Dwelling in a Natural Stream in Korea

자연하천에 서식하는 미꾸라지 Misgurnus mizolepis 피부 점액세포의 계절변화

  • Oh, Min-Ki (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University) ;
  • Park, Jong-Young (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
  • 오민기 (전북대학교 자연과학대학 생물과학부.생물다양성연구소) ;
  • 박종영 (전북대학교 자연과학대학 생물과학부.생물다양성연구소)
  • Received : 2010.11.15
  • Accepted : 2010.12.17
  • Published : 2010.12.31
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Abstract

Histological observation on the seasonal variation of mucus cells of the mud loach Misgurnus mizolepis inhabiting a natural stream was carried out on three skin regions (dorsal, lateral and occiput) from March 2008 to February 2009. Our results showed no differences in general morphology by season, but the mucus cells of the epidermis showed significant seasonal change in their size and number as the water temperature changed. The ratio of surface area of the mucus cell layer and mucus cells, and the number of mucus cells in surface area of the epidermis were the greatest in the cold winter and the least in the hot summer in all regions of the epidermis. In particular, the occiput seemed to be a very sensitive region in response to environmental change, showing wide fluctuations in the size of mucus cells throughout the year and a great change in between seasons, especially from late autumn to early winter when the temperature decreased. As the temperature became colder, a small and spherical-shaped mucus cell was transformed into a large and elongated columnar form with a lot of secreted mucus material in a superficial layer of the epidermis. From our results, we can safely surmise that cold temperature is an important environmental factor having a close relationship with the modification of mucus cells of M. mizolepis in winter.

자연하천에 서식하는 미꾸라지의 등, 체측, 후두부 피부조직에 대한 점액세포의 계절변화를 조사하였다. 2008년 3월부터 2009년 2월까지 계절변화에 대한 월별 조사에서 피부조직의 일반적인 형태변화는 없었으나, 상피조직 단위면적당 존재하는 점액세포의 크기와 개수는 겨울철에 가장 높게 나타났고, 여름철에 가장 낮게 나타나 계절변동에 따른 점액세포의 유의한 변화가 관찰되었다. 특히 후두부 부위는 점액세포의 계절변동 폭이 크고, 늦가을 환절기의 기온급감에 따른 점액세포의 급격한 변화를 보여 환경변화에 대한 반응이 가장 민감한 부위로 여겨진다. 또한 점액세포는 수온이 감소함에 따라 외부형태가 작은 구형에서 크고 긴 원주세포형으로 변화하였으며, 다량의 점액물질이 분비되었다. 본 연구를 통해 "저온"은 겨울철 미꾸라지 피부의 점액세포를 변화시키는데 밀접한 연관이 있는 중요한 환경요인으로 여겨진다.

Keywords

References

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