The Seasonal Variation of Active Bacterial Abundance in Lake Soyang

소양호에서 활성세균수의 계절적.수직적 변화

  • Published : 2001.03.01

Abstract

Vertical and temporal variations of active and total bacterial abundance were monthly estimated in Lake Soyang from April 1999 to January 2000. The number of total and respiring bacteria was determined directly under microscope by AODC and CTC methods, respectively. The number of total and active bacteria varied from $2.1{\times}10^5 to 3.1{\times}10^6 $,$cells{\cdot}ml^{-1}$ and $1.8{\times}10^4 to 8.0{\times}10^5 $,$cells{\cdot}ml^{-1}$, respectively. The proportions of respiring bacteria to total cell ranged from 3.7 to 44.2% : The proportions was the highest in November 1999 and the lowest in December 2000. The specific activity of${\beta}$-glucosidase divided by total bacteria was$1.6{\times}10^5\;amol{\cdot}cell^{-1}{\cdot}hr^{-1}$in August and$1.4{\times}10^5\;amol{\times}cell^{-1}{\times}hr^{-1}$in September while the specific activity divided by CTC active bacteria was about$3.6{\times}10^5\;amol{\cdot}cell^{-1}{\cdot}hr^{-1},\;24.0{\times}10^5\;amol{cdot}cell^{-1}{cdot}hr^{-1}$. The specific activity of active bacteria in September was 6.7 times higher than that of August. By these data of active bacteria, the new information of aquatic ecosystem was unveiled.

소양호에서 총세균수와 활성세균수의 계절적.수직적 변화를 측정하였다. 총세균수는 AODC방법을, 활성세균수 측정은 전자전달계를 이용한 호흡활성도 측정인 CTC 방법을 이용하였다. 조사기간 동안 총세균수는 $2.1{\times}10^5 ~ 3.1{\times}10^6 $ cells.$ml^{-1}$이었으며 활성세균수는 $1.8{\times}10^4 ~ 8.0{\times}10^5 $ cells..$ml^{-1}$로 나타났고, 총세균수에 대한 활성세균수의 비율은 3.7~44.2%이였다. 수직 분포를 보면 총세균수는 수온약층에 따라 그 수가 변화하였으나, 활성세균의 수는 큰 변화가 없었다. 총세균수의 값과 $\beta$-glucosidase 활성도의 간이 유사한 1999년 8월과 9월의 조사결과에서 $\beta$-glucosidase specific activity를 활성세균의 값에서 구한 결과, 9월의 활성이 8월보다 약 6.7배 높았다. 이 활성세균의 측정으로 수중생태계에서 세균의 역할에 대한 새로운 정보를 얻을 수 있다.

Keywords

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