A preliminary study of genetic structure and relatedness analysis of Nutria (Myocastor coypus) in Upo Wetland

Jung, Jongwoo,Jo, Yeong-Seok The National Institute of Biological Resources 2012 Journal of species research Vol.1 No.1

Nutria Myocastor coypus is one of a well known invasive riparian mammal found species around world from North America to Eurasia and Africa. In South Korea, feral nutrias inhabit areas from the Nakdonggang and Namgang (River) to their tributaries and Upo Wetland where they have had devastating effects on environment. Nevertheless, there has been little research about nutrias in Korea. This study is to analyze the genetic structure of the nutria population in the Upo Wetland and identify the origin of the source populations. Twenty individuals from the Upo Wetland were genotyped using 25 microsatellite loci. When compared with another introduced population, that of the Blackwater Nation Wildlife Refuge in U.S., the Upo population contains considerable genetic variations. Tests for Hardy-Weinberg equilibrium and Bayesian clustering analysis suggest the Upo population is genetically structured and has at least two source populations. This preliminary study presents the need for further in-depth studies about this species which should combine genetic and ecological studies.

Population Genetic Structure of Carassius auratus(Pisces: Cypriniformes) in South Korea Inferred from AFLP Markers

Jongwoo Jung 한국동물분류학회 2013 Animal Systematics, Evolution and Diversity Vol.29 No.1

A recent study on tile mitochondrial genetic variation of the Carassius auratus population in South Korea suggested that there are 3 distinct mitochondrial lineages in the country, and that they are geographically separated between westward rivers and southward rivers. respectively. In this study, the population genetic structure of amplified fragment length polymorphism (AFLP) of Carassius auratus was investigated. The results of analysis of molecular variance (AMOVA) supported the geographic distinction between westward and southward river populations, but only 3.66% of total genetic valiance lies among these populations. The panmicticity of the AFLP genetic variation is backed up by the results of the neighbor-joining dendrogram drawn from a linearized pairwise F_st mattrix and Bayesian clustering analysis. The discordance of genetic structure between mitochondrial and AFLP genetic variation may come from difference in effective population size between these markers and/or gene flow between westward and southward river populations through river capture events.

New Record of a Naidid Oligochaete Species, Ripistes parasita (Annelida: Clitellata: Naididae) from Korea

Jongwoo Jung 한국동물분류학회 2012 Animal Systematics, Evolution and Diversity Vol.28 No.2

An aquatic oligochaete species, Ripistes parasita (Schmidt, 1847) collected from Ganghwado Island in Korea, is described and illustrated. Specimens inhabiting on aquatic vegetation at the edge of the streams were collected with a plankton hand net. Morphological features of present specimens such as the number of long hair chaetae per bundle and their length in ⅥI-Ⅷ, and shape and size of ventral chaetae are concordant with those of previous reports on this species. The genus Ripistes contains one species, R. parasite which is distributed over, Europe, North America and eastern part of Asia including China and Japan. This is the first record of R. parasita in Korea.

The first record of Catenula confusa Nuttycombe, 1956 (Platyhelminthes: Catenulida: Catenulidae) from Korea

Jung, Jongwoo The National Institute of Biological Resources 2016 Journal of species research Vol.5 No.3

Microturbellarians, small free-living Platyhelminthes are rich in freshwater environments. They are useful as indicator of water quality. There has never been a record of microturbellarians in Korea. Here I report a microturbellarian species, Catenula confusa Nuttycombe, 1956. Although specimens in this study show some differences with those of the original description of C. confusa in length and width of zooid, they conform to the specific diagnosis of this species.

Twelve unrecorded species of testate amoebae discovered from Korea

Jung, Jongwoo The National Institute of Biological Resources 2020 Journal of species research Vol.9 No.4

Testate amoebae are easily recognized as their characteristic shells from other protistan groups. They in which more than 1,900 species have been recorded are mixture of heterogeneous groups mainly composed of Amoebozoa and Cercozoa. In Korea, 74 species of testate amoebae have been recorded since late 1980s. Here I report a list of 12 unrecorded species of testate amoebae from Korea which were discovered during 2016-2018: Arcella crenulata Deflandre, 1928; Centropyxis cassis(Wallich, 1864); C. delicatula Penard, 1902; C. hirsuta Deflander, 1929; C. orbicularis Deflandre, 1929; C. sylvatica (Deflandre, 1929); Cyclopyxis eurystoma Deflandre, 1929; C. intermedia Kufferath, 1932; C. kahli(Deflandre, 1929); Difflugia diafana Vucetich, 1987; D. manicata Penard, 1902; Awerintzewia cyclostoma Schoutenden, 1906. As a result the fauna of testate amoebae in Korea is composed of 86 species. There are still much more species remained to be discovered in Korea. The faunal studies on testate amoebae will provide us valuable information about freshwater and soil environments.

Isolation and characterization of polymorphic trinucleotide microsatellites of the polyploid crucian carp (<i>Carassius auratus</i>)

JUNG, JONGWOO,LEE, EUNJUNG,KIM, WON BLACKWELL 2007 MOLECULAR ECOLOGY NOTES Vol.7 No.1

<P>Abstract</P><P>In this study, we isolated and characterized nine polymorphic trinucleotide microsatellites (CAG and CCT) from the crucian carp (<I>Carassius auratus</I>). The number of alleles per locus ranged from two to six. Five loci showed a significantly excess homozygosity, and a genetic linkage between CAL0102 and CAL0495 was strongly suggested. Our results confirmed the triploidy of Korean individuals, and the microsatellites were found to be useful for analysing the allelic state of the polyploid crucian carp.</P>

New Records of Testate Amoebae from Korea

Jongwoo Jung 한국환경생물학회 2016 환경생물 : 환경생물학회지 Vol.34 No.4

Testate amoebae are useful organisms when evaluating the condition of freshwater ecosystems and wetland habitats. Herein, I report on seventeen unrecorded species of testate amoebae from Korea: Arcella arenaria, A. costata, A. hemisphaerica, Centropyxis constricta, C. discoides, C. spinosa, Difflugia amphora, D. globulosa, D. longicollis, D. penardi, Heleopera rosea, Hyalosphenia subflava, Nebela militaris, N. penardiana, Netzelia wailesi, Cyphoderia ampulla, and C. trochus.

New Records of Testate Amoebae from Korea

Jung, Jongwoo Korean Society of Environmental Biology 2016 환경생물 : 환경생물학회지 Vol.34 No.4

Testate amoebae are useful organisms when evaluating the condition of freshwater ecosystems and wetland habitats. Herein, I report on seventeen unrecorded species of testate amoebae from Korea: Arcella arenaria, A. costata, A. hemisphaerica, Centropyxis constricta, C. discoides, C. spinosa, Difflugia amphora, D. globulosa, D. longicollis, D. penardi, Heleopera rosea, Hyalosphenia subflava, Nebela militaris, N. penardiana, Netzelia wailesi, Cyphoderia ampulla, and C. trochus.

Two Genetic Lineages of Sea Slaters, Ligia (Crustacea: Isopoda) in South Korea: a Population Genetic Approach

Jung, Jongwoo,Eo, Hae-Seok,Rho, Hyun Soo,Kim, Won Korean Society for Molecular Biology 2008 Molecules and cells Vol.25 No.4

In this study, the species composition and population genetic properties of the sea slater, Ligia, in South Korea were investigated using mitochondrial and nuclear gene sequences. Two groups of sea slaters, genetically isolated from each other, a Western Group (WG) and an Eastern Group (EG) were identified. These groups exhibited considerable genetic divergence from Ligia exotica, previously recorded as a species inhabiting this country. These results indicate that there may be two species of Ligia in South Korea, but there is a small probability that both groups are L. exotica. A comparison of their genetic properties indicates that WG has a higher effective population size than EG, and that EG may have experienced a recent expansion, implying that it has a shorter history in South Korea than WG. These findings suggest that the South Korean sea slater populations may have been established as a result of several colonization events that can be traced on a continental scale by phylogeographic studies of sea slaters.

Population genetic analysis reveals secondary contact between Eriocheir sinensis and E. japonica in South Korea

Jung Jibom,Wu Xugan,Park Taeseo,Lee Seok-hyun,Hwang Hee-seung,Jung Juwon,Jung Jongwoo 한국유전학회 2022 Genes & Genomics Vol.44 No.5

Background: The Chinese mitten crab (Eriocheir sinensis) and the Japanese mitten crab (E. japonica) of the family Varunidae, which are also critical fishery species in their native habitats, including China, Japan, and South Korea, exhibit a rare migration life history for the decapod life cycle. Eriocheir sinensis and E. japonica in South Korea may have originated from speciation or secondary contact in South Korea after speciation of these two species; however, the genetic relationship between these South Korean populations remains unclear, and need to be clarified. Objective: This study examined the population genetic properties of E. sinensis and E. japonica in South Korea to reveal the origin of their co-existence. Methods: Mitochondrial DNA cytochrome c oxidase I sequences of 120 E. sinensis and E. japonica from 6 sampling sites in South Korea were sequenced. Their genetic diversity and haplotype data were compared to previously reported data from the Chinese mainland, Taiwan, Japan, and Russia. Results: The haplotype network, analysis of molecular variance, FST values, Mantel test, and Bayesian skyline plot results of South Korean E. sinensis and E. japonica demonstrated that E. sinensis and E. japonica were isolated from their central populations, Chinese and Japanese populations, by the distance due to the temperature, salinity, ocean current flow, or a geohistorical event. In addition, genetic analysis indicated that the South Korean populations of the two species were marginal populations, exhibiting low genetic diversity, significant negative neutrality values, and radial haplotype networks. The current results also suggest that the Geum River is an overlapping habitat for the natural populations of E. sinensis and E. japonica in South Korea. Further research is required to examine the geohistorical and evolutionary event between E. sinensis and E. japonica in South Korea. Conclusions: The co-existence of E. sinensis and E. japonica in South Korea may have originated from secondary contact after their speciation.