영농방법이 논에 서식하는 미꾸리 개체군의 체중-체장 관계에 미치는 영향
Influence of Farming Practices on Weight-Length Relationship of the Loach (Misgurnus anguillicaudatus) Population in Rice Paddy Fields
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친환경농법과 관행농법으로 대별되는 영농방법이 논 생 태계에 서식하는 미꾸리 개체군에 미치는 영향을 파악하 기 위하여 2014년 9월에 친환경 논과 관행 논에서 미꾸리망 을 이용하여 미꾸리 개체군의 빈도분포 및 무게-길이 상관 관계를 조사하였다. 그 결과 채집된 전체 미꾸리의 발육단계 별 개체수 빈도분포는 큰 차이를 나타냈다. 미꾸리의 무게와 길이의 평균값은 친환경 논이 관행 논보다 큰 것으로 나타 났지만, 범위는 관행 논이 높게 나타났다. 무게-길이 상관관 계식은 친환경 논과 관행 논에서 각각 W=0.000004L3.0747, W=0.000002L3.2106으로 나타났다. 평균 비대지수 (K)는 친환 경 논이 0.95로 관행 논 0.67보다 높게 나타났다. 결과적으 로 영농방법이 논에 서식하는 미꾸리 개체군의 발육에 영향 을 미치는 것으로 파악되었다.
Abstract
The length frequency and weight-length relationships within the loach population of Misgurnus anguillicaudatus were investigated in environment-friendly (EFP) and conventional paddy fields (CP) in South Korea, in order to identify the influences of farming practices to the loach population living in paddy ecosystem. The size-frequency of distribution of M. anguillicaudatus populations noted to differ significantly when the loach populations of the EFP and the CP were compared. The mean weight and length of the loach population in EFP was greater than those of the loaches in CP. The equations based on weight and total length relationship in EFP and CP were W=0.000004L3.0747 and W=0.000002L3.2106, respectively. The condition factor (K) against total length of loaches at two paddy field types with different farming practices indicates that the loach population in EFP (mean K=0.95) had access to better nutritional conditions than those in CP (mean K=0.67). It therefore appears that the size and structure of loach populations in rice paddy fields might be affected by farming practices.
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