This study was to analyze fish composition and ecological indicator characteristics from eight sampling sites of Geum River, October 2007. Total number of family and species sampled were 9 and 40. The most dominant family was Cyprinidae (27 species, 85%), and then followed by Cobitidae, Odomtobutida...
This study was to analyze fish composition and ecological indicator characteristics from eight sampling sites of Geum River, October 2007. Total number of family and species sampled were 9 and 40. The most dominant family was Cyprinidae (27 species, 85%), and then followed by Cobitidae, Odomtobutidae, and Gobiidae. Constancy values of Zacco platypus and Zacco temminckii were 1.00 and 0.30, respectively, and the relative abundance of Acheilognathus koreensis and Pseudogobio esocinus were greater than 5% of the total. The number of Korean endemic species sampled in this Geum River study was 7 family 19 species, which is 47.5% of total 40 species, and endangered species of Pseudopungtungia nigra and Gobiobotia brevibarba were only 0.5% of the total and these species were only distributed within the upstream regions. Exotic species, Micropterus salmoides, which is known as large-mouth bass, were observed in two sites of G3 and G7. Analytical results of fish community showed that community dominance index was 0.19, which is low, and the species evenness index (0.74), diversity index (2.03), and richness index (3.00) appeared high. These results indicate that structure of fish community is stable in the Geum River. According to various guilds analysis, the relative abundance of tolerant and omnivores at all sites were 40% and 47% of the total, respectively. This monitoring data may contribute changes of fish fauna and compositions in relation to habitat modifications and chemical water quality degradations in the future.
This study was to analyze fish composition and ecological indicator characteristics from eight sampling sites of Geum River, October 2007. Total number of family and species sampled were 9 and 40. The most dominant family was Cyprinidae (27 species, 85%), and then followed by Cobitidae, Odomtobutidae, and Gobiidae. Constancy values of Zacco platypus and Zacco temminckii were 1.00 and 0.30, respectively, and the relative abundance of Acheilognathus koreensis and Pseudogobio esocinus were greater than 5% of the total. The number of Korean endemic species sampled in this Geum River study was 7 family 19 species, which is 47.5% of total 40 species, and endangered species of Pseudopungtungia nigra and Gobiobotia brevibarba were only 0.5% of the total and these species were only distributed within the upstream regions. Exotic species, Micropterus salmoides, which is known as large-mouth bass, were observed in two sites of G3 and G7. Analytical results of fish community showed that community dominance index was 0.19, which is low, and the species evenness index (0.74), diversity index (2.03), and richness index (3.00) appeared high. These results indicate that structure of fish community is stable in the Geum River. According to various guilds analysis, the relative abundance of tolerant and omnivores at all sites were 40% and 47% of the total, respectively. This monitoring data may contribute changes of fish fauna and compositions in relation to habitat modifications and chemical water quality degradations in the future.
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문제 정의
Since the previous 1992 survey in Geum River, little is known about fish compositions and guild characteristics in Geum River. This study was to elucidate the fish fauna and composition patterns in trophic guild and tolerance guilds along with community structures of fish using community index analysis. In addition, we also comparatively analyzed changes of fish species compositions and distributions over time in comparison with previous studies of Geum River.
제안 방법
Using dataset of fish composition in previous researches (Choi et al., 1977; An et al., 1992) and this sampling, we comparatively analyzed the fish species composition of Geum River mainstream before and after Daecheong Dam construction. Though there were some differences between site numbers and sampling methods, it was sampled 24 family and 89 species in Choi et al.
성능/효과
According to the tolerance guild analysis, sensitive species (SS) which is easily disappeared by degree of water pollutions was 19.5% (Relative Abundance, RA), whereas tolerant species (TS), usually increased species number and distribution range along with water quality and habitat deteriorations was 39.6% (RA) and intermediate species (IS) was 35.1% in this study. Thus, TS was dominant in the tolerance guild analysis.
Among sampled 14 species in Gl, located the most headwater reach among the sampling sites (32 km from the headwater), TS was presented only 3 species but Zacco platypus was dominant over 40% so that affected to the TS dominance. In case of G2 (87 km from the headwater), representative SS, Zacco temminckii was dominant over 45% so that presented the highest SS as 55.
7%) were greater than 5% of the total. Analysis of constancy values (number of 요ites observed/total number of visiting sites), Zacco platypus, which is tolerant to the water quality and not food-specific, was 1.0 and other species such as Pseudogobio esocinus, Acheilognathus lanceolatus, Pungtungia herzi, Hamibar- bus longirostris, Opsarichthys uncirostris amur- ensis, and Odontobutis interrupta were >0.75. The species with high constancy in this study are similar to previous studies of fish fauna in 사eum River watershed (An et al.
In contrast, some siteof G4, G6 and G8 had low number of species and this phenomenon was dueto habitat simplifica- tions by sand depositions and partially run-habitat. As shown in other streams, relative abundance of Zacco platypus and Zacco temminckii were 30% and 14%, respectively, and the abundance of Acheilognathus koreensis (8.0%) and Pseudogo- bio esocinus (6.7%) were greater than 5% of the total. Analysis of constancy values (number of 요ites observed/total number of visiting sites), Zacco platypus, which is tolerant to the water quality and not food-specific, was 1.
The must dominant family was Cypr- inidae (27 species), and Cobitid죠e (3 species). Families such as Centropomidae, Odontobutidae, and Gobiidae had two species respectively and others such as Bagridae, Siluridae, Amblycipi- tidae and Centrarchidae had one species (Table 1). The relative abundance of Cyprinidae was > 85% in Geum River and this results were accord with the previous studies of streams which flow in west-southern part of Korea (An et al.
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