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Chikuma 강 중류 수역에서 하안 보호 공사가 Stenopsyche marmorata(Trichoptera)에 미치는 영향(Central Japan)
( Hirabayashi Kimio ),( Yachiyo Fukunaga ),( Goro Kimura ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
Since a large bank-protection works project was undertaken during winter in the middle reaches of the Chikuma, the riverbed structure was drastically altered. In order to assess the short-term impact of bank-protection works on the abundance pattern of Stenopsyche marmorata (Trichoptera) from spring to early summer, we conducted an investigation on the capture of adults using light traps before and after construction work. The patterns of the daily capture of S. marmorata and the cumulative number of individuals were different before and after construction. Namely, after construction, the daily catch of adult numbers increased only slightly during the investigation periods. This suggested that the age structure of the S. marmorata larval population had changed in the construction area. Our data suggest that bank-protection projects impact the abundance pattern of adult caddis-flies in the river ecosystem.
Chikuma 강 상-중류 수역 수서곤충의 분포 양상(Central Japan)
( Hirabayashi Kimio ),( Goro Kimura ),( Yachiyo Fukunaga ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
The species composition and abundance of aquatic insects were investigated by light trap in summer, 2002 at three stations in the Chikuma River, Japan`s longest river. A total of 3278 adults/day were collected, the great majority (57.5%) of which were Diptera, followed by Trichoptera (35.4%) and then Ephemeroptera (7.1%). The number of collected aquatic insects and their biomass gradually increased towards downstream, whereas the number of species and species diversity index (H`) decreased. 36 species (H` = 4.30) of aquatic insects were collected at St. 1, versus 31 species (H` = 2.81) at St. 3. Moreover, the relative abundance of functional feeding groups changed from St. 1 to St. 3, i.e., collectors increased and shredders decreased.