Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Development of a Filamentous Green Algal Community in the Littoral Zone of Lake Biwa: a Mini-review

Biwa호 연안대에서 사상성 녹조류 군집의 발달

  • Published : 2004.12.31
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Abstract

The development of a benthic filamentous green algal community formed by Spiro gyra sp. in early summer has been observed in the littoral zones in the north basin of Lake Biwa since the 1980s. The development of a Spirogyra sp. community may have an effect on the increase in the biomass of the benthic algal community in early summer and on the alterations in seasonal fluctuation patterns of the biomass. In this mini-review, the causes underlying the development of the Spirogyra sp. community are discussed on the basis of studies in the seasonal fluctuations of benthic algal communities in littoral stony zones carried out in 1963-1964, 1995-1996 and 2000-2001, especially those focusing on the nutrient concentration $(NO_3^--N)$. $NO_3^--N$ concentrations in June were higher than $100{\mu}g\;L^{-1}$ in 1995 and 2000 in contrast to a concentration in June 1964 of only $20{\mu}g\;L^{-1}$. These results show that $NO_3^--N$concentrations throughout in 1963-1964 period were considerably lower than those in 1995-1996 and 2000-2001, suggesting that the $NO_3^--N$concentration may have served as a limiting factor on Spirogyra sp. growth in 1963. $NO_3^--N$ concentrations in the pelagic zone in the north basin of Lake Biwa have clearly increased from the 1950s under the impact of economic growth and the increasing population in the watershed. The development of the Spirogyra sp. community seems to be the result of a heady increase in the nutrient supply from human activities.

1980년대 이래로 Biwa호 북측 지역 연안대에서 초여름 동안 Spjrozyra에 의해 조성된 저서 사상성 부착녹조류 군집의 발달이 관찰되어 왔다. 이들의 발달은 초여름 저서 조류 군집의 생물량 증가와 생물량의 계적적 변동 양상에 영향을 미친 것으로 판단된다. 본 논문에서는 Spjrozyra 군집 발달의 원인을 1963-64년, 1995-96년, 2001-02년 동안 수행된 연구 결과(특히,영양염,$NO_3^--N$)에기초하여 고찰하였다. 6월 동안의 $NO_3^--N$의 농도는 1964년 6월에 $20{\mu}g\;L^{-1}$에 비교할 때 1995년과 2002년은 $100{\mu}g\;L^{-1}$ 이상이었다. 이 결과는 $NO_3^--N$가 1963년도에 Spjrogyra 성장에 대해 제한요인으로 작용하였음을 시사한다. Biwa호 북측 지역 개방수역에서 $NO_3^--N$의 농도는 1950년대이후 유역에서의 인구증가와 경제성장의 영향으로 뚜렷하게 증가하였다. 따라서 Biwa호에서 Spjrogyra 군집의 발달은 인간활동에 의한 영양염 공급의 증가의 결과로 추정된다.

Keywords

References

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