• Title, Summary, Keyword: jesogammarus

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First Record of the Brackish Water Amphipod Jesogammarus (Jesogammarus) hinumensis (Amphipoda: Anisogammaridae) from Korea with DNA Barcode Analysis among Jesogammarus Species

  • Lee, Chi-Woo;Tomikawa, Ko;Min, Gi-Sik
    • Animal Systematics, Evolution and Diversity
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    • v.35 no.3
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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.

One New Species of Freshwater Anisogammaridae(Crustacea, Amphipoda, Anisogammaridae) from South Korea (한국 담수산 Jesogammarus (Crustacea , AMphipoda , Anisogammaridae)의 1 신종)

  • 이경숙;서인순
    • Animal Systematics, Evolution and Diversity
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    • v.6 no.2
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    • pp.251-260
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    • 1990
  • This study deals with 8 species in 6 genera including 5 new species and 2 new records from Taiwan. The new ones are Neanura kentingensis n.sp., Womersleya formosana n.sp., Crossodinthina montana n.sp., Vitronura tubercula sp., Lobella nana n.sp., and 2 new records are Pseudachorucina nepalica Yosii, 1966 and Lobella perfusa Denis., 1934. The Neanuridae fauna of Taiwan accordingly is listed as 13 species in 7 genera. The biogeographic affinities with the Japan, Vietnam and adjacent countries are discussed.

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One New Species of Freshwater Jesogammaws (Crustacea, Amphipoda, Anisogammaridae) from South Korea (한국 담수산 Jesogammarus(Crustacea, Amphipoda, Anisogammaride)의 1신종)

  • 이경숙;서인순
    • The Korean Journal of Zoology
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    • v.35 no.3
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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.

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Ecological Impact of the Dyke Construction on the Marine Benthos Community of the Oligohaline Youngam Lake (영암호 저서동물군집에 미친 하구둑 건설의 영향)

  • LIM Hyun-Sig;CHOI Jin-Woo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.38 no.3
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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.