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열목어 ( Brachymystax lenok tsinlingensis ) 의 먹이선택 습성
변화근,조규송,최재석,박정호,최준길,손영목,전상린 ( Hwa Kun Byeon,Kyu Song Cho,Jae Suk Choi,Jung Ho Park,Jun Kil Choi,Yong Mook Son,Sang Rin Jeon ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.3
We investigated diet of Manchurian trout(Brachymystax lenok tsinlingensis) at Jindong stream from October 1993 to August 1994. The stomach was U shaped with 57-69 Pyloric caeca. Gill rackers number externally on first gill arch was from 12 to 20, and premaxillary teeth with pointed was 24. The diet of B. lenok tsinlingensis was mainly acquatic insects, such as ephemeroptera, trichoptera, plecoptera, diptera, and nematoda, teleost fishes, land insects, amphibian and decapoda. Larger fish tended to ingest a higher proportion of the larger prey types, such as amphibian(frog), teleost fishes(Moroco kumgangensis, Ladislavia taczanowskii), nematoda(nematomorpha) and decapoda(crayfish), but younger year-classes to eat more Chironomidae. Land insects of the stomach contents was found mainly autumn. Aquatic insects(ephemeroptera, trichoptera and diptera) constituted the bulk of food items ingested during each season. The prey selection indices for ephemeroptera were positively selected in summer, and negatively selected in spring and autumn, plecoptera and trichoptera were positively selected in spring and negatively selected in summer and autumn. In contrast, diptera was always positively selected. B. lenoktsinlingensis classification of trophic categories is chaser.
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박정호,조규송 ( Jung Ho Park,Kyu Song Cho ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.3
This study was conducted to investigate the community structure of aquatic insects in Pangtae Creek(or Jindong stream) located at the upper basin of the North Han River from April 1992 to September 1993. Aquatic insects were classified into 151 species within 40 families and 7 orders. Abundance of aquatic insects at each sites were Trichoptera(41.1%), Ephemeroptera(36.9%), Diptera(15.6%), and Plecoptera(4,72%). The fauna and flora of the Pangtae Creek are well preserved and forest stands were luxuriant along side. Also variable range of water temperature was narrow and water temperature during midsummer at the Pangtae Creek was no zooming. Confirmed pH was neutral value from 6.0 to 6.9. The dissolved oxygen revealed high value about 15ppm. Therefore, Current velocity, water temperature, pH, dissolved oxygen, and substrate were important factors determining species composition and abundances. Dominance indices ranged between 0.15∼0.68 and 0.15∼0.46 in 1992 and 1993, respectively. Species diversity indices ranged from 1.48 to 3.67 in 1992 and from 2.20 to 3.45 in 1993. Diversity, richness, and eveness indices in these areas were fairly higher than those in other areas investigated previously. This result suggest that the Pangtae Creek could be characterized as clear water stream; Oligosaprobic.
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