This study investigated benthic macroinvertebrates and fish in the Yeongsangang River weir and analyzed stomach contents of Squalidus chankaensis tsuchigae. Length distribution of individuals varied by site, with 91.3% and 72.7% falling within the 70-90 mm range in SC-U (upstream location of Seungchon weir) and SJ (location between Seungchon and Juksan weirs), respectively, and 77.5% within 70-80 mm and 100 mm range in JS-D (downstream location of Juksan weir). Chironomidae spp. (nonred type) were the most abundant food sources, comprising 46.3%, 76.9%, and 88.3% of the diet at SC-U, SJ, and JS-D, respectively. The Electivity Index (EI) indicated a strong preference for Chironomidae spp. (non-red type) (0.927) and avoidance for the red type (-0.929) and Limnodrilus gotoi (-0.995). The proportion of burrowers (BU) increased downstream, while swimmers (SW) decreased. The condition factor (K) varied by site, decreasing in SC-U and increasing in SJ and JS-D, showing a significant positive influence on the number of food sources (p<0.05). Among food sources, Chironomidae spp. and Baetidae sp. were predicted to be utilized across a broad range of lengths and weights, with strong connectivity observed among Tanypodinae sp., Hymenoptera sp., and Baetiella tuberculata.

Abstract
1. 서 론
2. 재료 및 방법
    2.1. 조사지점 및 시기
    2.2. 조사방법 및 분석
    2.3. 참몰개의 전장-체중 관계, 비만도
    2.4. 먹이 선택성 지수
    2.5. 먹이원 분석
3. 결과 및 고찰
    3.1. 참몰개의 전장 분포
    3.2. 각 지점에서의 먹이원 및 먹이 유형 분석
    3.3. 각 지점에서의 먹이 유형 비교
    3.4. 참몰개의 전장-체중 관계 및 비만도 지수
    3.5. 비만도 지수와 먹이원 개체수의 관계
    3.6. 전장-체중에 따른 특정 먹이원 섭식 예측
    3.7. 참몰개의 먹이원 네트워크 분석
적 요
CRediT authorship contribution statement
Declaration of Competing Interest
REFERENCES

• 김재훈(안동대학교 생명과학과, 안동대학교 환경연구소) | Jae-Hun Kim (Department of Biological Science, Andong National University, Andong 36729, Republic of Korea, Environmental Institute, Andong National University, Andong 36729, Republic of Korea)
• 이종은(안동대학교 생명과학과, 안동대학교 환경연구소) | Jong-Eun Lee (Department of Biological Science, Andong National University, Andong 36729, Republic of Korea, Environmental Institute, Andong National University, Andong 36729, Republic of Korea) Corresponding author
• 민병하(안동대학교 생명과학과) | Byung-Ha Min (Department of Biological Science, Andong National University, Andong 36729, Republic of Korea)
• 김지윤(충남대학교 생명과학과) | Ji Yoon Kim (Department of Biological Science, Chungnam National University, Daejeon 34134, Republic of Korea)
• 안광국(충남대학교 생명과학과) | Kwang-Guk An (Department of Biological Science, Chungnam National University, Daejeon 34134, Republic of Korea)
• 박용수(국립생태원 멸종위기종복원센터) | Yong-Su Park (Research Center for Endangered Species, National Institute of Ecology, Yeongyang 36531, Republic of Korea)