표제지
목차
초록 15
서론 18
Chapter 1. 달서천 어류 군집 및 외래종 나일틸라피아 (Oreochromis niloticus) 개체군의 생태적 특성 22
초록 23
Ⅰ. 서론 25
Ⅱ. 재료 및 방법 27
1. 조사시기 27
2. 조사지점 29
3. 조사방법 31
4. 분석 방법 33
Ⅲ. 결과 및 고찰 37
1. 서식 환경 분석 37
2. 어류상 44
3. 군집분석 50
4. 내성도 길드 분석 52
5. 하천 건강성 평가(FAI) 54
6. 나일틸라피아 개체군 분석 56
Ⅳ. 결론 76
Ⅴ. 참고문헌 78
Abstract 88
부록 90
Chapter 2. 달서천에 서식하는 외래종 틸라피아(tilapia)의 형태·유전학적 종 판별 92
초록 93
Ⅰ. 서론 95
Ⅱ. 재료 및 방법 98
1. 틸라피아 채집 98
2. Genomic DNA 추출 100
3. MtDNA COI 유전자 증폭 101
4. DNA 염기서열 정렬 및 유전자 분석 103
Ⅲ. 결과 및 고찰 107
1. New record 107
2. 형태적 분류키 109
3. 형태학적 종 판별 111
4. 유전학적 종 판별 114
5. 틸라피아 원산지 추정 118
6. 수생태계 영향 120
Ⅳ. 결론 121
Ⅴ. 참고문헌 122
Abstract 131
Chapter 3. 국내 하천에 서식하는 Oreochromis 속 틸라피아 (tilapia)의 잠재적 서식 분포 예측 133
초록 134
Ⅰ. 서론 135
Ⅱ. 재료 및 방법 138
1. 문헌 조사 138
2. 수온 예측 분석 139
Ⅲ. 결과 및 고찰 140
1. 나일틸라피아와 블루틸라피아의 국외 서식 분포 140
2. 국내 틸라피아 서식 분포 143
3. 잠재적 서식 가능지역 예측 145
4. 틸라피아의 생태계 위해성 148
Ⅳ. 결론 150
Ⅴ. 참고문헌 152
Abstract 158
Table 1.1. Physical factors of each sampling sites in the Dalseo Stream and Geumho River, South Korea 38
Table 1.2. Chemical factors of each site in Dalseo Stream and Geumho River, South Korea 40
Table 1.3. Dominant and sub-dominant species, and community structure index at each investigation period, in the Dalseo Stream 51
Table 1.4. FAI index according to the investigation period in the Dalseo Stream 55
Table 1.5. Physical characteristics of tilapia spawning grounds in the Dalseo Stream, South Korea 61
Table 1.6. A list of individual number of fish collected by survey period in the Dalseo Stream from January and November 2019 90
Table 2.1. List of additional sequences downloaded from GenBank 104
Table 2.2. NCBI GenBank accession numbers used in this study 105
Table 2.3. Morphological comparisons between O. niloticus and O. aureus according to Trewevas (1983) 110
Table 2.4. Morphological comparisons of O. niloticus and O. aureus from Dalseo Stream 112
Table 2.5. Species identification of each specimen based on morphological and genetic analyses 116
Figure 1.1. The map of sampling sites in the Dalseo Stream and Geumho River, Daegu Metropolitan City, South Korea. 30
Figure 1.2. Seasonal variations in water temperature and air temperature in Dalseo Stream and Geumho River. Vertical... 43
Figure 1.3. Species ratio (up) and individuals ratio (down) of each family of collecting fishes in Dalseo Stream. 46
Figure 1.4. Relative abundance of the fish in the Dalseo Stream. 48
Figure 1.5. Number of Oreochromis niloticus individuals per investigation period. 48
Figure 1.6. Tolerance analysis depending on different trophic states in the Dalseo Stream. The abbreviations are as follow;... 53
Figure 1.7. Stomach contents in Oreochromis niloticus populations. The stomach contents, which appear green and brown,... 57
Figure 1.8. (A) Oreochromis niloticus in spawning grounds identified during field investigation & (B) Location map of spawning... 60
Figure 1.9. Relationship between the total length and total weight (up), and between the total length and condition factor... 63
Figure 1.10. Relationship between the total length and total weight (up), and between the total length and condition factor... 66
Figure 1.11. Relationship between the water temperature of Dalseo Stream and the total length of Oreochromis niloticus per... 68
Figure 1.12. Distribution of the total length frequency of the O.niloticus population. The dotted lines separately... 70
Figure 1.13. Gonadosomatic index by investigation period of male (up) and female (down) Oreochromis niloticus sampled... 73
Figure 1.14. Relationship between body weight and gonadosomatic of Oreochromis niloticus sampled in Dalseo Stream, South... 75
Figure 2.1. The map of sampling sites in Dalseo Stream and Geumho River, Daegu Metropolitan City, South Korea. 99
Figure 2.2. (A) Oreochromis niloticus (male), (B) Oreochromis niloticus (female), (C) Oreochromis aureus (male) and... 108
Figure 2.3. Average comparisons of the dosal fin spines, total dosal fin spines and gill rakers of O. niloticus and O. aureus.... 113
Figure 2.4. Neighbor-Joining (NJ) tree of 49 COI sequences from Oreochromis species, Oreochromis hybrids, and Tilapia... 117
Figure 2.5. Neighbor-Joining (NJ) tree of 204 COI sequences from Oreochromis niloticus, Oreochromis aureus, and Tilapia zillii... 119
Figure 3.1. The current global distribution of Nile tilapia (Oreochromis niloticus) and Blue tilapia... 142
Figure 3.2. Distribution of tilapia habitats identified in the reference, in Korea. 144
Figure 3.3. Changes in air temperature and water temperature distribution by target period in South Korea estimated by... 147