Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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The Annual and Seasonal Changes of Lorica Morphology in Keratella.

거북등윤충 (Keratella) 피갑 형태의 연도 및 계절별 변화

  • La, Geung-Hwan (Department of Environmental Education, Sunchon National University) ;
  • Choe, Ji-Min (Department of Environmental Education, Sunchon National University) ;
  • Kim, Hyun-Woo (Department of Environmental Education, Sunchon National University)
  • 라긍환 (순천대학교 환경교육학과) ;
  • 최지민 (순천대학교 환경교육학과) ;
  • 김현우 (순천대학교 환경교육학과)
  • Published : 2009.06.30
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Abstract

We investigated annual and seasonal changes of Keratella spp. among rotifer community in the lower part of the Nakdong River (Mulgum) for four years (1995, 1997, 2005, 2007). As well, the annual and seasonal variations of lorica morphologies including sizes, posterior and anterior spines lengths in K. cochlearis were analyzed. The density of Keratella spp. showed distinct seasonality such as spring peak and winter scarcity. K. cochlearis was the most dominant species within Keratella spp. and the relative abundances of 2005 and 2007 were higher than 1995 and 1997. The lorica length and width of K. cochlearis did not show the annual changes between four years however, there was an obvious width decrease in summer and increase in winter. The proportion of individuals that has the posterior spine was relatively low throughout four years, especially at summer and autumn. K. cochlearis displayed short posterior spine in summer and long posterior spine in winter contrary to the anterior median and intermediate spines.

낙동강 물금 지역에서 채집된 동물플랑크톤 중 윤충류인 Keratella 속을 대상으로 10년 전후(1995, 1997, 2005 그리고 2007)의 종조성 변화를 분석하고, 피갑형태에 다양한 변화를 보이는 K. cochlearis의 피갑 크기, 후돌기의 발현 여부 및 길이 그리고 후두돌기 길이의 연도와 계절에 따른 변화를 측정하였다. Keratella 속의 밀도는 봄에 높고 겨울에 낮은 뚜렷한 계절성을 보였다. 군집 내에서 K. cochlearis가 우점종이었으며 상대풍부도는 1995년과 1997년보다 2005년과 2007년에서 높게 나타났다. 연도별 K. cochlearis의 피갑 폭은 유사하였으나, 피갑 길이의 경우 여름에 감소하고 겨울에 증가하는 특징을 보였다. 모든 연도에서 후돌기를 발현하는 개체의 비율이 낮았고 특히 여름과 가을에 출현빈도가 낮았다. 후돌기의 평균 길이는 여름에 짧고 겨울에 길였으며 후두돌기 펑균 길이는 겨울에 가장 짧은 것으로 나타났다.

Keywords

References

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