• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.977-981
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• 2010

한강수계에서 배가사리 Microphysogobio longidorsalis의 물리적 서식지 평가를 위하여 2008년 10월부터 2009년 11월까지 11개 지점을 선정하여 어류 채집을 실시하였다. 모든 지점에서 채집된 어류는 총 10과 39종 3,886개체였다. 한국고유종은 배가사리 및 참갈겨니 Zacco koreanus 등 22종(61.8%)이 출현하였다. 출현어종 중 개체수 구성비가 가장 높은 종은 피라미 Z. platypus로 25.8%를 차지하였고, 다음은 쉬리 Coreoleuciscus splendidus 16.5%, 배가사리 15.2% 등의 순으로 나타났다. 모든 지점에서 채집된 배가사리는 8~10 cm이 가장 많았다. 또한 물리적 서식지는 수심 0.4~0.5 m, 유속 0.2~0.9 m/s, 하상재료 모래(0.1~1.0 mm)~호박돌(100.0~300.0 mm) 및 서식처 유형은 유수역(run)으로 나타났다.

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2011.04a
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• pp.98-103
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• 2011

도심하천에서 채집된 어류는 총 7과 17종 315개체가 확인되었으며, 자연하천에서 채집된 어류는 6과 21종 1,033 개체가 조사되었다. 도심하천에서 출현한 한국 고유종은 치리(Hemiculter eigenmanni)와 얼룩동사리(Odontobutis interrupta) 2종(11.8%)이었으며, 생태계교란야생동물에 속하는 종인 배스(Micropterus salmoides)가 폐쇄형 하도습지에서 출현하였다. 자연하천에서 출현한 한국고유종은 쉬리 (C. splendidus), 배가사리(Microphysogobio longidorsalis) 등 총 13종(61.9%)으로 고유종의 빈도가 높았고, 멸종위기 II급에 속하는 종인 묵납자루(A. signifer)와 가는돌고기(Pseudopungtungia tenuicorpa) 등 2종(9.5%)이 조사되었다. 두 하천의 군집분석을 비교한 결과 도심하천이 자연하천에 비해 우점도와 균등도 지수가 높게 나왔다. 이와 같은 결과는 도심하천과 자연하천이 같은 유형의 서식처이지만 도심하천의 경우 양안 수변대와 제방구축, 하천정비, 고수부지의 시멘트화 등의 원인과 오염원의 유입, 풍부한유기물 때문인 것으로 판단된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.209-209
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• 2011

본 연구는 횡성다목적댐이 준공되면서 유수역이었던 섬강이 정수역의 환경으로 변하면서 나타난 어류의 군집변화에 대하여 알아보고자 시행하였다. 조사 지역인 횡성다목적댐은 강원도 횡성군 갑천면 대관대리에 위치하고 있으며, 높이 48.5m, 길이 205m, 총저수량 8,690만t의 다목적댐으로 1993년 12월에 착공하여 2000년 11월에 준공되었다. 어류 조사는 2010년 04월부터 2010년 11월까지 총 4회에 걸쳐 횡성다목적댐을 기점으로 상류 2지점(유평교, 매일교), 횡성호 2지점(구방교, 부동교), 하류 2지점(활아지교, 수백교)에서 조사를 실시하였고 과거 문헌과 비교하여 결과를 분석하였다. 횡성다목적댐의 착공 전/후 조사 결과를 비교한 결과 착공하기 전에는 총 8과 29종 2,325개체가 조사되었으며, 참갈겨니(Zacco koreanus) 576개체(24.8%), 쉬리(Coreoleuciscus splendidus) 316개체(13.6%), 피라미(Zacco platypus) 203개체(8.7%), 배가사리(Microphysogobio longidorsalis) 194개체(8.3%) 등의 순으로 기록되었다. 반면, 착공한 후에는 총 8과 24종 2,769개체가 조사되었으며, 피라미(Z. platypus) 2,169개체(78.3%), 밀어(Rhinogobius brunneus) 91개체(3.3%), 참갈겨니(Z. koreanus) 89개체 (3.2%), 돌고기(Pungtungia herzi) 83개체(3.0%) 등의 순으로 조사되었다. 각 조사지점별로 비교한 결과 상류 2지점(유평교, 매일교)에서는 착공하기 전에 총 6과 20종 609개체가 조사되었으며, 참갈겨니(Z. koreanus) 227개체(37.3%), 피라미(Z. platypus) 74개체(12.2%), 쉬리(C. splendidus) 65개체(10.7%), 돌고기(P. herzi) 43개체(7.1%), 납자루(Acheilognathus lanceolatus) 41개체(6.7%) 등의 순으로 기록되었다. 반면, 착공한 후에는 총 6과 16종 1,923개체가 조사되었으며, 피라미(Z. platypus)가 1,707개체(88.8%)로 대부분을 차지하였고, 그 외 참갈겨니(Z. koreanus) 53개체(2.8%), 돌고기(P. herzi) 46개체(2.4%), 참마자(Hemibarbus longirostris) 35개체(1.8%), 모래무지(Pseudogobio esocinus) 23개체(1.2%) 등의 순으로 조사되었다. 횡성호 2지점(구방교, 부동교)에서는 착공하기 전에 총 6과 22종 721개체가 조사되었으며, 참갈겨니(Z. koreanus) 177개체 (24.5%), 배가사리(M. longidorsalis) 91개체(12.6%), 쉬리(C. splendidus) 88개체(12.2%), 묵납자루(A. signifer) 71개체(9.8%), 피라미(Z. platypus) 45개체(6.2%) 등의 순으로 기록되었다. 반면, 착공한 후에는 총 6과 12종 393개체가 조사되었으며, 피라미(Z. platypus) 228개체(58.0%), 붕어(C. auratus) 56개체(14.2%), 밀어(R. brunneus) 46개체(11.7%), 쏘가리(Siniperca scherzeti) 20개체(5.1%), 동자개(Pseudobagrus fulvidraco) 16개체(4.1%) 등의 순으로 조사되었다. 하류 2지점(활아지교, 수백교)에서는 착공하기 전에 총 8과 25종 995개체가 조사되었으며, 참갈겨니(Z. koreanus) 172개체(17.3%), 쉬리(C. splendidus) 163개체(16.4%), 묵납자루(A. signifer) 96개체(9.6%), 배가사리(M. longidorsalis) 91개체(9.1%), 피라미(Z. platypus) 84개체(8.4%) 등의 순으로 기록되었다. 반면, 착공한 후에는 총 7과 19종 453개체가 조사되었으며, 피라미(Z. platypus) 234개체(51.7%), 밀어(R. brunneus) 42개체(9.3%), 돌고기(Pungtungia herzi) 36개체(7.9%), 참갈겨니(Z. koreanus) 36개체(7.9%), 쉬리(C. splendidus) 10개체(4.2%) 등의 순으로 조사되었다. 본 연구의 조사 및 비교분석 결과 유수역이었던 섬강에 횡성다목적댐이 건설되어 주변 환경이 크게 변화하였고 그 결과 각 조사 지점에서의 어류상이 유수역 선호 어종에서 오염 내성종 및 정수역 선호 어종으로 변화되는 것을 확인하였다.

• Korean Journal of Ichthyology
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• v.11 no.1
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• pp.1-11
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• 1999

The five species of the genus Microphysogobio in Korea are reviewed with the keys to species and their illustrations: M. longidorsalis, M. jeoni sp. nov., M. koreeneis, M. yaluensis, and M. rapidus. Microphysogobio tungtingensis uchidai was treated as a junior synonym of M. yaluensis based on having the distinct papillae of upper lip and the color pattern on body sides by the examination of the type specimens. Microphysogobio jeoni is described as a new species from the specimens collected in the Naktong River, Han River and Keum River, Korea. it is well distinguished from the related species by the slender body, undeveloped papillae of upper lip and unspotted fins. Microphysogobio yaluensis was showed the clinal variations in the number of lateral line scales and vertebrae among the populations in the western drainages of Korea. It is remarked biogeographically that the five species of Microphysogobio are all endemics to Korea with the restricted ranges.

• Journal of Practical Agriculture & Fisheries Research
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• v.16 no.1
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• pp.123-133
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• 2014

We assessed the physical habitats of Microphysogobio longidorsalis in the Han river basin. Field monitoring was conducted for ecological and habitat conditions for 11 sites from October 2008 to November 2011. Twenty species (50.0%) including M. longidorsalis and Zacco koreanus were found endemic out of the 40 species in 10 families sampled during this study period. The most frequently found species was Z. platypus (26.2%) followed by Z. koreanus (17.7%), Coreoleuciscus splendidus (14.0%) and M. longidorsalis (13.4%). For M. longidorsalis, total fist length showing the highest number of samples were 8~10 cm (50.9%). the favored habitat conditions were estimated to be 0.4~0.5 m (56.1%) for water depth, 0.2~0.9 m/s (90.4%) for flow velocity, sand (0.1~1.0 mm)~cobbles (100.0~300.0 mm)(94.5%) for substrate size and run (60.2%) for habitat type, respectively.

• Korean Journal of Environment and Ecology
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• v.19 no.1
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• pp.46-54
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• 2005

The change of fish community in the Wonju-stream was investigated from May to November, 2004. During the period,24 species belonging to 6 families were collected. There were 10 Korean endemic species$(41.7\%)$, including Pseudopungtungia tenuicorpa, Coreoleuciscus spiendidus, Squalidus gracitis majimae, Squalidus japonicus coreanus, Microphysogobio yaluensis, Microphysogobio longidorsalis, Iksookimia koreensis, Koreocobitis rotundicaudata, Liobagus andersoni and Odontobutis interrupts. The dominant species was Zacco Platypus$(54.7\%)$, and the subdominant species was Rhynchocypris oxycephalus$(16.7\%)$. Also, Carassius auratus$(5.4\%)$, I. koreensis$(3.4\%)$, Orthrias toni$(3.3\%)$, and Pungtungia herzi$(3.0\%)$ appeared. According to the fish species compositions, the fish community was divided into 2 groups by an unweighted pair group method using arithmetic averages(UPGMA). The comparison of the fish community showed that benthic fish species were decreased, while, the number of water-column species, resistant 1,o substrate changes and water pollution were increased.

• Korean Journal of Environment and Ecology
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• v.11 no.1
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• pp.100-110
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• 1997

To clarify the structure and function of ecosystem and establish the method for the conservation of biodiversity and community analysis at Soksacheon and Gyebangcheon, the authors surveyed the aquatic environment and freshwater fish fauna at 13 stations from July, 1995 to June, 1996. Collected 1,908 individuals were belong to 20 Species, 4 Oredr, 1 Suborder, 6 family, 7 Subfamily. The detail results are as follows. 1. It was confirmed that most of the surveyed stations were mountain valley of river type Aa, Ab. River structures were mixed with pebble, sand, rock and water quality of Soksacheon were pH(7.41), [COND.(0.051), TURB.(10.00), DO(8.66), W.T.(15.4)] and Gyebangcheon were pH(7.44), [COND.(0.097), TURB.(21.59), DO(9.35), W.T.(15.4)]. 2. Among them, 18 species were primary freshwater fishes(99.98%) and 2 species of pheripheral freshwater fishes(0.02%). 12 species(60%) of them were endemic species of Korea and they were Moroco kumgangenesis, Microphysogovio longidorsalis, Cobitis rotundicaudata, Misgurnus anguillicaudatus, Coreoleucisus splendidus, Cobitis longicorpus, Oncorhynchus masou ishikawai, Brachymystax lenok, Hemibarbus longirostris, Silurus microdorsalis, Cobitis koreensis koreensis and Hemibarbus mylodon. 3. Dominant species were Moroco kumgangenesis(46.85%) and Zacco temmincki(27.35%).

• Spatial Information Research
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• v.6 no.1
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• pp.91-102
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• 1998

The objectives of this research were to develop fish-habitat relationship models which can be used to estimate fish species riclmess of small and medium rivers in Korea, and test the accuracy of the models. The models are based on the Aquatic GAP Analysis model in the New York Cooperative Fish & Wildlife Research Unit (19%), and they employ three habitat factors; river size, physical habitat, and water quality of each river segment. Model 1 and model II are based on the water quality standard for life support of EP A and the water quality class of Korea, respectively. Test sites for this study include one urban stream and three less spoiled tributaries of the Han River. The results of this research can be summarized as follows. First, the number of habitat types identified by model I and model II are nine and 14, respectively. Second, the average accuracy of the three distribution maps of rare or endangered fish species are 80.6% (model 1) and 81.2% (model II). Third, the accuracy of fish species richness are 94% (model 1) and 95% (model II), and the water quality is the most important factor affecting fish species richness. Fourth, the accuracy of fish species list are 50.5% (model 1) and 68.7% (model II), but the accuracy of less spoiled stream segments and that of polluted stream segments are 67.1% and 86.5%, respectively. Finally, it can be concluded that the overall performance of model II is better than that of model I at our test sites.

• Korean Journal of Weed Science
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• v.13 no.2
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• pp.159-163
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• 1993

This research was conducted at the Crop Experiment Station to determine the changes of weed flora under direct seeded rice cultivation in dry paddy field from 1989 to 1992 and to establish an effective weed control strategy in direct seeded rice cultivation. With the continuous rice growing under direct seeded rice cultivation in dry paddy field, there were more occurrence in grasses and annual weeds while broadleaf and perennial weeds were diminished. The predominant weeds were aquatic weeds such as Eleocharis kuroguwai, Echinochloa crusgalli, and Monochoria vaginalis in machine transplanted rice paddy field while there were predominant of semi aquatic weed species such as E. crusgalli, Digitaria sanguinalis, Bidens tripartita, Aeschynomene indica, and Arthraxon hispidus in continuous direct seeded rice cultivation in dry paddy condition. Based on the vegetative analysis of weeds in terms of simpson index and community dominance, there was more distribution of weed species in direct seeded rice cultivation on dry paddy condition while only distributed with 1-2 weed species in machine transplanted rice paddy field. In similarity coefficient, there was a gradual increase up to 67% of weeds with the continuous direct seeded rice cultivation in dry paddy condition for 4 years starting from 41% of similarity coefficient.

• Journal of the Korean Wood Science and Technology
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• v.43 no.1
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• pp.52-59
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• 2015

Cross-cut disks from small diameter oak logs were thermally modified and developed to make accessories such as a brooch. However it is known that domestic oaks are refractory and it is hard to dry their cross-cut disks without any drying defects. The cross-cut disks of Quercus variabilis (7 mm long in the longitudinal direction) were forced to dry in air at two different air velocities in summer and fall season, and their drying yields were investigated. Under the same condition, the average final moisture contents (MCs) of the specimens dried in the fall were lower than those dried in the summer. The average final MCs of the small diameter specimens dried at higher air velocity were slightly lower than those at lower air velocity while those of the large diameter specimen were not influenced by the air velocity. The number of the large diameter specimens with cross checkings was higher than that of the small diameter specimen. This discrepancy between two different diameters was twice in the fall, while it was more than four times in the summer. The large diameter specimens dried at low air velocity in Summer were cross-checked most, which was attributed to repeated water condensation and evaporation due to high humidity and low air velocity.