By using Surber net aquatic insects were collected monthly from May 1992 to April 1995 in the Suyong and Soktae Steams of the Suyong River flowing through the municipal area of Pusan. In Suyong stream, 90 species, 75 genera and 44 families were collected, and Chironomidae was the most abundant gruop...
By using Surber net aquatic insects were collected monthly from May 1992 to April 1995 in the Suyong and Soktae Steams of the Suyong River flowing through the municipal area of Pusan. In Suyong stream, 90 species, 75 genera and 44 families were collected, and Chironomidae was the most abundant gruop. The most dominant species was Orthocladius suspensus, and Hydropsyche sp. was also abundant, especially at YCK (Changki). The community was the most diverse in YCK, also the number of collected individuals was the highest in YCK. The dominant species and dominance indices varied monthly in each sampling location due to the environmental disturbance such as high rainfall, inflow of large amount of water from Noktong River to YSC (Sinchon), inflow of organic matter from surrounding residential areas, various constructions along and around stream. In Soktae stream, 88 species, 79 genera and 39 families were collected. Overall, Chironomidae was also the most abundant insect, and the most dominant species was Orthocladius suspensus. But, dominant species were also varied among sites due to the environmental disturbance such as high rainfall, inflow of high amount organic matter from surrounding residential areas, various constructions along and around stream. Aquatic insects were also collected in the middle reaches of the Paenae stream, a tributary of the Naktong River in Korea, seasonally from August 1994 to April 1995. 82 species, 62 genera and 32 families were collected, and the dominant species was Ecdyonurus sp. The community was the most diverse in autumn, while the abundance was the highest in winter. Chironomids including Diamesa sp.1 were collected exceptionally in a large number in winter. Seasonal occurrences of collectors, shredders and scrapers were related to the availablity of food sources in the stream. Secondary production of Hydropsyche sp. was assessed based on the size frequency method in Suyong and Soktae streams. Life history of Hydropsyche sp. was bivoltine. The mximum annual production was 43.619 g/㎡(wet weight) in YCK in Suyong stream at the first year (May 1992∼April 1993), while the minimum was 0.009 g/㎡ in TKC (Kochon) in Soktae stream during the first year (May 1992∼April 1993) except THP(Hapansong) where Hydropsyche sp. was not collected. Drifting aquatic insects were collected in the middle reaches of the Paenae stream, a tributary of the Naktong River in Korea, seasonally from August 1989 to May 1990. 44 species, 42 genus, 31 families and 6 orders were collected from the drift. The numerically abundant groups were Ephemeroptera and Diptera, including Heptagenidae, Baetidae, and Chironomidae. Drifting insects were the most diverse in autumn while abundance was the highest in spring. The primary consumers including Baetidae, Heptagenidae and Chironomidae were collected more than the secondary consumers, and the burrowers. Except some species, densities of insects in drift appeared to be increased as their benthic densities were increased. Drifting aquatic insects were also collected at the Paenae stream during the period of rainfall at summer of 1992. Before the rainfall, 6 orders, 12 families, and 15 species were collected, and after the rainfall, the same numbers of orders, families and species were collected. However, the number of insects collected were different. Species such as Heptagenia sp. and Ephemera sp. were increased after the rainfall while Pseudocloeon sp. was decreased. Ephemeroptera drifted with the highest density regardless of rainfall, in the order of Baetis spp. and Pseudocloeon spp. Generally drifting insects appeared to be having two diel peaks. The first and higher peak appeared from 6.p.m to midnight while the second and lower peak was observed from 3.a.m to 6.a.m. The number of drifting individuals was the highest (1,160 individuals/24hr) at August 17th when the discharge gradually decreasing to the baseflow. Diel periodicity in drifting appeared to be dependant on the discharge. When the dischage is increased to the medium level that it does not disturb the substratum composition of the streambed, active drift by periodically drifting species was decreased while passive drift was increased.
By using Surber net aquatic insects were collected monthly from May 1992 to April 1995 in the Suyong and Soktae Steams of the Suyong River flowing through the municipal area of Pusan. In Suyong stream, 90 species, 75 genera and 44 families were collected, and Chironomidae was the most abundant gruop. The most dominant species was Orthocladius suspensus, and Hydropsyche sp. was also abundant, especially at YCK (Changki). The community was the most diverse in YCK, also the number of collected individuals was the highest in YCK. The dominant species and dominance indices varied monthly in each sampling location due to the environmental disturbance such as high rainfall, inflow of large amount of water from Noktong River to YSC (Sinchon), inflow of organic matter from surrounding residential areas, various constructions along and around stream. In Soktae stream, 88 species, 79 genera and 39 families were collected. Overall, Chironomidae was also the most abundant insect, and the most dominant species was Orthocladius suspensus. But, dominant species were also varied among sites due to the environmental disturbance such as high rainfall, inflow of high amount organic matter from surrounding residential areas, various constructions along and around stream. Aquatic insects were also collected in the middle reaches of the Paenae stream, a tributary of the Naktong River in Korea, seasonally from August 1994 to April 1995. 82 species, 62 genera and 32 families were collected, and the dominant species was Ecdyonurus sp. The community was the most diverse in autumn, while the abundance was the highest in winter. Chironomids including Diamesa sp.1 were collected exceptionally in a large number in winter. Seasonal occurrences of collectors, shredders and scrapers were related to the availablity of food sources in the stream. Secondary production of Hydropsyche sp. was assessed based on the size frequency method in Suyong and Soktae streams. Life history of Hydropsyche sp. was bivoltine. The mximum annual production was 43.619 g/㎡(wet weight) in YCK in Suyong stream at the first year (May 1992∼April 1993), while the minimum was 0.009 g/㎡ in TKC (Kochon) in Soktae stream during the first year (May 1992∼April 1993) except THP(Hapansong) where Hydropsyche sp. was not collected. Drifting aquatic insects were collected in the middle reaches of the Paenae stream, a tributary of the Naktong River in Korea, seasonally from August 1989 to May 1990. 44 species, 42 genus, 31 families and 6 orders were collected from the drift. The numerically abundant groups were Ephemeroptera and Diptera, including Heptagenidae, Baetidae, and Chironomidae. Drifting insects were the most diverse in autumn while abundance was the highest in spring. The primary consumers including Baetidae, Heptagenidae and Chironomidae were collected more than the secondary consumers, and the burrowers. Except some species, densities of insects in drift appeared to be increased as their benthic densities were increased. Drifting aquatic insects were also collected at the Paenae stream during the period of rainfall at summer of 1992. Before the rainfall, 6 orders, 12 families, and 15 species were collected, and after the rainfall, the same numbers of orders, families and species were collected. However, the number of insects collected were different. Species such as Heptagenia sp. and Ephemera sp. were increased after the rainfall while Pseudocloeon sp. was decreased. Ephemeroptera drifted with the highest density regardless of rainfall, in the order of Baetis spp. and Pseudocloeon spp. Generally drifting insects appeared to be having two diel peaks. The first and higher peak appeared from 6.p.m to midnight while the second and lower peak was observed from 3.a.m to 6.a.m. The number of drifting individuals was the highest (1,160 individuals/24hr) at August 17th when the discharge gradually decreasing to the baseflow. Diel periodicity in drifting appeared to be dependant on the discharge. When the dischage is increased to the medium level that it does not disturb the substratum composition of the streambed, active drift by periodically drifting species was decreased while passive drift was increased.
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