Seasonal Dynamics and Community Structure of Tintinnina in lower Seomjin River System

섬진강 하류계에서 유종섬모충류의 군집구조와 계절적 동태

  • 유형빈 (전남대학교 사범대학 생물교육과) ;
  • 박수산 (전남대학교 사범대학 생물교육과)
  • Published : 2001.03.01

Abstract

Precent study has been carried out to clarify the ecological characteristics of Tintinnina community, during the period from March,1998 to January, 1999 at twelve stations in lower Seomjin river system. During the surveyed period, a total of 56 species were identified. Seasonal variation of number of species occurred was varied: 43 species during spring season, 21 species during summer season, 27 species during autumn season, 20 species during winter season. Total abundance of Tintinnina ranged from 0 to 170,134 indiv./㎥. The abundance was high in March and low in September. Among 22 dominant species, 18 species (81.8%) were Tintinnopsis genus. The relationships between environmental factors and Tintinnina community were as follows; 11 species (Tintinnopsis rara, T. angulata, T. sp. 1, T. sp. 4, T. sp. 5, T. sp. 8, T. sp. 9, Stenosemella pacifica, S. steini, Codonellopsis nipponica, Favella taraikaensis) occurred from 10 to 15$^{\circ}C$ and 2 species (Codonella amphorella, Leprotintinnus neriticus) occurred from 5 to 3$0^{\circ}C$. Many species occurred from 10.1 to 25.0$\textperthousand$ of salinity. Four species (Tintinnopsis acuminata, T. angulata, T. sp. 10, T. sp. 11) occurred in freshwater only, while four species (Tintinnopsis rapa, T. baltica, T lata, Codonella sp.) occurred from 0.1 to 31.2$\textperthousand$ of salinity.

본 연구는 유종섬모충류의 생태학적 특성을 알아보기 위하여 1998년 3월부터 1999년 1월까지 격월로 섬진강 하류계에서 12개 정점을 선정하여 실시하였다. 조사기간 중 유종섬모충류는 총 8속 56종이 동정 분류되었다. 출현종의 월별분포는 1998년 3월에 7속 40종으로 가장 많이 출현하였고, 1998년 11월에 2속 3종으로 가장 적은 종이 출현하였다. 출현종의 정점별 분포는, 정점 12에서 8속 38종으로 가장 많았고, 정점 3에서 2속 5종으로 가장 적게 출현하였다. 유종섬모충류의 월별 총출현량은 20,099 (5월) - 699,502 indiv./㎥ (3월)의 범위로 변동하고 있었다. 정점별로는 정점 11에서 가장 많은 출현량(431,706 indiv./㎥)을 보였고, 정점 4에서 가장 적은 출현량(8,777 indiv./㎥)을 보였다. 우점종은 22종으로 그중 Tintinnopsis속이 18종으로 전체 우점종의 81.8%를 차지하였다. 유종섬모충류의 군집동태와 환경요인과의 상관관계에서는 여러 환경요인 중 수온과 염분도가 군집동태에 가장 큰 영향을 미친 것으로 조사되었는데 수온은 10-15$^{\circ}C$에서, 염분도는 10.1-25.0$\textperthousand$ 구간에서 다양한 종 조성과 높은 출현량을 나타내었다.

Keywords

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