가야산 수계 내 저서성 대형무척추동물의 군집특성과 이화학적 수질요인과의 상관관계
A Community Characteristic on Benthic Macroinvertebrates and Correlation of Physicochemical Water Quality Factors in Stream of Gaya Mountain
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본 연구에서는 가야산 수계에 분포하는 저서성 대형무척추동물 군집의 특성을 밝히고 이화학적 수질요인과의 상관관계를 확인하였다. 연구기간동안 확인된 저서성 대형무척추동물은 총 4문 6강 13목 36과 100종이었으며 종수 점유율은 하루살이목, 날도래목, 강도래목, 파리목, 비곤충류, 노린재목, 잠자리목의 순으로 나타났다. 우점종은 민하루살이(Cincticostella levanidovae)로 우점도17.72%였으며, 아우점종은 띠무늬우묵날도래(Hydatophylax nigrovittatus)로 우점도 6.15%였다. 생물지수 중 전체조사지역에대한 다양도는 5.17, 풍부도는 12.44로 나타난 반면, 우점도는 0.24, 균등도는 0.78로 가야산 수계에 서식하는 저서성 대형무척추동물은 특정종이 우점하지 않는다는 것을 알 수 있다. 주요 분류군과 이화학적 수질 요인간의 상관관계를 확인해 본 결과 하루살이목과강도래목은 수온과 음의 상관관계를 나타내고 용존산소량과는 양의 상관관계를 나타내었는데 이는 청정수계의 지표군인 하루살이목과 강도래목의 서식에 영향을 미치는 중요한 이화학적 수질요인으로 수온과 용존산소량을 들 수 있음을 의미한다.
Abstract
In this study the community characteristics of benthic macroinvertebrates distributed in stream of Gaya Mountain were figured out and the correlation with the physicochemical water quality factors were calculated. During the study period, total 4 phyla, 6 classes, 13 orders, 36 families, 100 species of benthic macroinvertebrates were recorded. Ephemeroptera were the most dominant followed by Trichoptera, Plecoptera, Diptera, Non-insecta, Hemiptera, and Odonata. The overall dominant species was Cincticostella levanidovae by dominance rate in 17.72%, subdominant species was Hydatophylax nigrovittatus by dominance rate in 6.15%. The biotic indices showed the diversity index 5.17, richness index 12.44, dominant index 0.24 and evenness index 0.78, there is no absolutely dominant benthic macroinvertebrates in the stream of Gaya Mountain. We identified the correlation between the species number and individuals of main taxa and the physicochemical water quality factors. Ephemeroptera and Plecoptera showed a negative correlation with water temperature, but they represented a positive correlation with the dissolved oxygen. This results suggest that water temperature and dissolved oxygen are important physicochemical water quality factors affects the distribution of Ephemeroptera and Plecoptera, the indicators of clean water stream.
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