• Animal Systematics, Evolution and Diversity
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• 제35권3호
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• pp.151-155
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• 2019

Jesogammarus (Jesogammarus) hinumensis Morino, 1993 was discovered firstly from a brackish water region in Jeju Island, Korea. To identification of the specimens we conducted both of morphological and molecular analyses. This species is characterized by having large eyes and a robust seta on the mandibular palp article 1. The morphology of this Korean specimens was well matched with the original description without variation. The mitochondrial cytochrome c oxidase subunit I(COI) sequences of the present specimens were also completely identical to the sequences of J. (J.) hinumensis collected from the type locality of the species. Thus, we concluded that the Jesogammarus species from Jeju Island is J.(J.) hinumensis, based on both morphological and molecular data.

• Animal Systematics, Evolution and Diversity
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• 제6권2호
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• pp.251-260
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• 1990

1987년 7월부터 1990년 5월까지 경기도, 충청남도, 충청북도 그리고 전라북도의 11개 지역의 웅덩이와 샘물에서 담수산 옆새우류를 채집하여 관찰한 결과 Jesogammarus(Annanogammarus) 1신종이 확인되어 Jesogammarus(an-nanogammarus) koreaensis라고 명명하여 기재한다. 본종은 Jesogammarus(Annanogammarus) fluvialis Morino 1985와는 제1안테나 첫번째 병부마디에 distal spine이 있는 점이 다르다.

• 한국동물학회지
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• 제35권3호
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• pp.344-349
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• 1992

The anisogammaridean specimens urere collected in a swamp near the lake in Kangnung, Kang-won-do province in South Korea in June 1986 and November 199G. The examined specimens were identified as a new species belongs to Jesogqmmaws (Jesogammows). It was fully described ann illustrated under the name of Jesogummaws (Jesogommows) ilhoii.

• 한국수산과학회지
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• 제38권3호
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• pp.172-183
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• 2005

To assess the macrobenthic community of oligohaline Youngam Lake, which is located at the Youngsan Watershed on the southwest part of Korea, macrobenthic fauna were collected at 45 stations during May, 2002. A total of 16 species of macrofauna were recorded with a mean density of 240 individuals per $m^2$ and a mean biomass of 7.07 g wet weight per $m^2$. Major dominant faunal groups were crustacean arthropods in terms of the number of species and abundance, and polychaete annelids in terms of biomass. The mean grain size was $5.7\;{\phi}$ which was dominated by silt fraction. The hydrological environment of the lake was characterised as an oligohaline environment with a mean surface water temperature of $17.8^{\circ}C$ and a mean salinity of 2.08 psu. The major dominant species were amphipods, Corophium sp. ($31\%$) and Jesogammarus sp. ($25\%$). Lowe. values of species diversity (H') with a mean of 0.81 (less than 1.0 from most stations) reflected the overall poor faunal diversity in this area. Multivariate analysis suggested that this benthic faunal community could be divided into four sub-regions such as the area from lake proper to water channel to the south, the stations located at the entrance and northern water channel, the stations near the dike, and the lake proper area. Freshwater and brackish water species which occurred in each station group were corresponded to the oligohaline salinity regime. Bottom hypoxia appeared in the entrance part of the lake between dyke and lake proper on May, which was resulted from stratification from spring season. These facts imply that marine macrobenthos were severely impacted by low salinity and a consequent hypoxia after embankment of the lake due to the restriction of water circulation.