[논문]점봉산의 한 일차하천에 서식하는 대형무척추동물의 풍부도와 현존량

정근

점봉산의 한 일차하천에 서식하는 대형무척추동물의 풍부도와 현존량
Abundance and Biomass of Macroinvertebrate Association in a First Order Stream at Mt. Jumbong, Kangwon-do 원문보기

한국육수학회지 = Korean journal of limnology, v.38 no.1 = no.110, 2005년, pp.1 - 10

초록
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1997년 11월부터 1998년 10월 사이에 강원도 인제군에 있는 점봉산의 한 일차하천에 서식하는 저서성 대형무척추동물을 직경 20 cm의 원통형 채집기를 이용하여 2 ${\sim}$ 4주 간격으로 11회 조사하였다. 조사기간 중 수온은 $0\;{\sim}\;14^{\circ}C$, 전기전도도는 15${\sim}$ 25 ${\mu}s$ $cm^{-1}$로 유지되었다. 곤충류는 53분류군이 채집되었으며 옆새우 등의 무척추동물도 채집되었다. 년평균 개체수 (${\pm}$1 SD)는 77741${\pm}$69232${\cdot}$m $^{-2}$${\cdot}$yr$^{-1}$로서, 겨울에 높고 (12월: 171178${\pm}$130468 $m^{-2}$) 여름에 낮았다 (6월: 29872${\pm}$13078 $m^{-2}$). 이중에서 Chironomidae (Diptera) 중 비포식성 아과와 Nemoura sp. (Nemouridae: Plecoptera)는 각각 53.3%와 21.8%를 차지하였다. 현존량은 회분외중량 (AFDW) 으로 10 gAFDW${\cdot}$m$^{-2}$${\cdot}$yr$^{-1}$이었는데 늦겨울에 가장 높았고(2월 16 gAFDW $m^{-2}$) 여름에 낮았다(6월: 3 gAFDW $m^{-2}$). 곤충은 이중에서 57%를 차지하였다. 현존량에서 가장 중요한 분류군은 Gammarus sp. (Gammaridae: Amphipoda)로서 전체의 39.8%를 차지하였으며 비포식성 Chironomidae 아과가 15.2%, Hydatophylax sp. (Limnephilidae: Trichoptera)는 8.5%를 차지하였다. 비포식성 Chironomidae가 여러 종으로 구성된 것을 고려하면 이 일차하천에서 가장 흔한 분류군은 Nemoura sp.이다. 그러나 이 일차하천에서 기능적으로 가장 주요한 대형무적추동물은 Gammarus sp.로 생각된다.

Abstract ▼ AI-Helper

Macroinvertebrates from a first order stream at Mt Jumbong, Kangwon-do, was examined for their abundance and biomass. Sampling was done by using a pipe sampler (${\phi}$ 20 cm) for 11occasions (n = 5) at 4${\sim}$6 weeks intervals during November 1997 through October 1998. Water temperature and electronic conductivity of the study stream ranged $0\;{\sim}\;14^{\circ}C$ and 15${\sim}$25 ${\mu}s$/cm, respectively. During the study, 53 insect taxa and 3 non-insect taxa were collected. Annual mean number of individuals (${\pm}$1 SD) was 77741${\pm}$69232${\cdot}$m$^{-2}$ ${\cdot}$yr$^{-1}$, being high in winter (${\pm}$1 SD) (December: 171178${\pm}$130468 $m^{-2}$) and low in summer (${\pm}$ 1 SD) (June: 29872${\pm}$13078 $m^{-2}$). Non-predatory subfamilies of Chironomidae and Nemoura sp. occupied 53.3% and 21.8% of annual abundance. Annual mean biomass was 10g${\cdot}$m$^{-2}$${\cdot}$yr$^{-1}$ in ash free dry weight (AFDW), being high in late winter (February: 16 gAFDW $m^{-2}$.) and low in summer (June: 3 gAFDW $m^{-2}$). Gammarus sp. represented 39.8% of the total biomass and was followed by non-predatory subfamilies of Chironomidae (15.2%) and Hydatohylax sp. (8.5%, Limnephilidae: Trichoptera). Since the non-predatory subfamilies of chironomidae were composed of many species, Nemoura sp. was the most abundant taxon. However, Cammarus sp. was surely the most important taxon to the functional aspects of this first order stream ecosystems.

주제어

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가설 설정

2). The author thinks that the soft substrata in the study stream provided more habitat space for aquatic insects than substrata with relatively hard surface in down streams did. The low abundance of Chironomidae and Nemoura sp.

제안 방법

Then, biomass (in ash free dry weight: AFDW) of each taxon was estimated by using the body length-biomass relationships (unpublished data), which had been derived from individuals within a day after treatment with 5~8% formalin solution. For taxa the body length- biomass relationships were lacking, those of other taxa with similar body form were used.
Since macroinvertebrates require diverse habitat types, those collected from litter bags might not properly represent macroinvertebrate assemblages in the study stream. Therefore, in this study, the author collected macroinvertebrates from natural substrates from the stream where litter bag studies were done and described them in abundances and biomasses.

대상 데이터

In the laboratory, samples were washed with tap-water and passed through nested 1 mm and 0.25 mm sieves. All macroinvertebrates retained on the 1 mm-sieve were identified.

성능/효과

chocorata, Baetis sp., and C. castanea represented 43.3% (18.3 ~69.2%), 34.7% (10.1~63.1%) and 10.3% (0.0~ 45.3%) of the ephemeopteran density, respectively. Plecopteran taxa were rare in summer and abundant during autumn and winter (Fig.
2%) of the dipteran abundance. Tanypodinae, a predatory subfamily and the second most abundant dipteran taxa, occupied only 2.7% (1.0~7.3%) of dipteran density. The third most abundant taxon was Dicranota sp.

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