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PubMed | Kongju National University, Southwest Research Institute, Chungnam National University, National Marine Biodiversity Institute of Korea and Kunsan National University
Type: | Journal: Harmful algae | Year: 2017

Photosynthesis in the ciliate Mesodinium rubrum is achieved using a consortium of cryptophyte algal organelles enclosed in its specialized vacuole. A time-series microarray analysis was conducted on the photosynthetic ciliate using an oligochip containing 15,654 primers designed from EST data of the cryptophyte prey, Teleaulax amphioxeia. The cryptophycean nuclei were transcriptionally active over 13 weeks and approximately 13.5% of transcripts in the ciliate came from the sequestered nuclei. The cryptophyte nuclei and chloroplasts could divide in the ciliate, which were loosely synchronized with host cell division. A large epigenetic modification occurred after the cryptophyte nuclei were sequestered into the ciliate. Most cryptophyte genes involved in the light and dark reactions of photosynthesis, chlorophyll assimilation, as well as in DNA methylation, were consistently up-regulated in the ciliate. The imbalance of division rate between the sequestered cryptophyte nuclei and host nuclei may be the reason for the eventual cessation of the kleptoplastidy.

Wi J.H.,Chonnam National University | Jeong M.-K.,Chonnam National University | Jeong H.G.,National Marine Biodiversity Institute of Korea
Marine Biodiversity | Year: 2016

Two new species of Zeuxo Templeton 1840 are described from the western and southern coast of Korea (North West Pacific). Zeuxo gracilis n. sp. and Z. spina n. sp. belong to the “Z. normani species complex”. Zeuxo gracilis is distinguished from species within this complex by the following morphological combination in females: the spine row of the left mandible bears a bifid spiniform seta; pleonites 4 and 5 bear one and two lateral setae, respectively; the cheliped merus bears two ventral and two inner setae; and pereopods 2–6 bear a distal simple seta on merus. Zeuxo spina shows unique features characterized by a serrated ventral seta on each propodus of pereopods 2 and 3 and the cheliped merus bearing two ventral and one inner setae. Additional character states are proposed for defining new and/or sibling species within the Z. normani species complex. In order to confirm the presence/absence of morphological variations of Zeuxo, detailed morphological features between same- and different-sized females of Z. gracilis are compared and discussed. © 2016 Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg

PubMed | Chonnam National University, National Marine Biodiversity Institute of Korea and Chosun University
Type: | Journal: ZooKeys | Year: 2017

A new eusirid amphipod,

Yi C.H.,National Marine Biodiversity Institute of Korea | Kim J.H.,Sungkyunkwan University
Ocean Science Journal | Year: 2016

In 2007–2008, a population outbreak of the solitary ascidian Herdmania momus was observed along the coasts of Jeju Island and the ascidians became the top dominant species in macrobenthic communities. We conducted field experiments on population dynamics and demographic parameters including seasonal density fluctuation, vertical distribution, recruitment patterns, mortality, and growth rate. Recruitment continued year-round except in April following the lowest water temperature season in February. Population density was highest in August-October, concomitantly with the peak in recruitment, related to the highest water temperature. The lowest density was observed in February-April when the water temperature was lowest. In April all individuals disappeared from all permanent plots, resulting in a maximum life span of 10–12 months. Individuals of newly recruited H. momus grew to have an adult size of 4–6 cm in only 3–4 months. Higher densities were observed in the shallower areas (5 m) compared to the deeper zones. More recruitment occurred on vertical slopes than horizontal substrates, but substrate pre-occupancy caused no difference in recruitment. This is the first report on H. momus population-level investigation in Korea, which provides valuable baseline information on the current status of population demography and their potential community-level influence on Jeju coasts. © 2016, Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media Dordrecht.

Jung T.W.,National Marine Biodiversity Institute of Korea | Yoon S.M.,Chosun University
Journal of Natural History | Year: 2015

The family Nuuanuidae Lowry and Myers, 2013 is first reported from Korean waters by the discovery of Nuuanu paracyclodactyla sp. nov. and Parvipalpus gen. nov., erected with the description of Parvipalpus holocaudatus sp. nov., along with their detailed descriptions and illustrations. The monotypic genus, Parvipalpus gen. nov., is characterized by the bi-articulate mandibular palp, the uni-articulate outer ramus of uropod 3, and no cleft telson. The new species, Nuuanu paracyclodactyla sp. nov., is very similar to Gammarella cyclodactyla (Hirayama, 1978) in the peculiar shape of propodus and dactylus on gnathopod 2 in mature males, but the former is distinguished readily by the absence of dorsal keels on the pleons and urosomite 1. New keys to genera of this family and to species of the genus Nuuanu are provided. © 2015 The Author(s). Published by Taylor & Francis.

Kim J.G.,Chosun University | Jung T.W.,National Marine Biodiversity Institute of Korea | Yoon S.M.,Chosun University
ZooKeys | Year: 2016

A new species, Strongylacron glabrum sp. n. is described from intertidal mudflats in the Korean peninsula. The new species is assigned to the monospecific genus Strongylacron Gee & Huys, 1996 in accordance with the generic morphological features of the rostrum, antennary exopod, and thoracic legs. However, Strongylacron glabrum sp. n. is clearly distinguished from the type species, S. buchholtzi (Boeck, 1873), by the naked anterior margin of rostrum, the elongate exopod and endopodal lobe of female P5 approximately 3.5 and 2.7 times as long as width, respectively, and the presence of 8–10 rod-like projections on prosomites. The genus Strongylacron is first recorded from Korean waters by the present study. © Jong Guk Kim et al.

Back J.,National Marine Biodiversity Institute of Korea | Lee W.,Hanyang University
Zootaxa | Year: 2014

A study of benthic harpacticoids from the intertidal zone of Gosapo Beach, on the west (Yellow Sea) coast of Korea, re-sulted in the discovery of two species of Wellsopsyllus Kunz, 1981. The first new species, Wellsopsyllus (Wellsopsyllus) egregius sp. nov., was allocated to the nominotypical subgenus by a combination of three characters: 1) a 3-segmented P4 exopod, 2) 1-segmented P2-P3 endopods, and 3) a P1 endopod-2 with one apical seta. However, it can be clearly distin-guished from its congeners by the following characters: 1) a caudal rami with two blunt setae and the seta VII located sub-distally, 2) a P2 and P3 endopod represented by a small blunt process, and 3) the semioval shape of P5. The second new species was placed in the subgenus Scottopsyllus Apostolov & Marinov, 1988 according to the 3-segmented exopod and 2-segmented endopod of P4. Wellsopsyllus (S.) koreanus sp. nov. exhibits a unique combination of characters: 1) a dim-pled distal margin of the female P5 endopodal lobe armed with two subequal setae, 2) a caudal seta V consisting of a stout spine-like base with a long cylindrical seta-like portion arising subdistally, and 3) a distinct bundle of five long inner set-ules on the P1 basis. We present a summary of the characters of all species in the genus Wellsopsyllus and propose an up-dated key for their identification. Copyright © 2014 Magnolia Press.

Baek K.,Chung - Ang University | Baek K.,National Marine Biodiversity Institute of Korea | Jeon C.O.,Chung - Ang University
International Journal of Systematic and Evolutionary Microbiology | Year: 2015

A Gram-stain-negative, strictly aerobic, non-pigmented, motile bacterium with a single polar flagellum, designated H29T, was isolated from coastal sediment of Jeju Island, South Korea. Cells were non-spore-forming rods showing catalase- and oxidase-positive reactions. Growth of strain H29T was observed at 10–40 8C (optimum, 20–25 8C) and pH 6.0–9.0 (optimum, pH 7.0–8.0), and in the presence of 1–4% (w/v) NaCl (optimum, 2–3 %). Strain H29T contained C16:0, iso-C15:0 3-OH and summed feature 3 (comprising C16:1ω7c/C16:1ω6c) as the major fatty acids and ubiquinone-8 (Q-8) as the sole isoprenoid quinone. Phosphatidylethanolamine and phosphatidylglycerol were identified as the major polar lipids. The G+C content of the genomic DNA was 46.5 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain H29T formed a phyletic lineage with Rheinheimera hassiensis E48T within the genus Rheinheimera of the family Chromatiaceae. Strain H29T was most closely related to Rheinheimera pacifica KMM 1406T, Rheinheimera muenzenbergensis E49T, Rheinheimera hassiensis E48T and Rheinheimera baltica OSBAC1T with 97.8 %, 97.6 %, 97.4% and 97.2% 16S rRNA gene sequence similarities, respectively. However, DNA–DNA hybridization values of strain H29T with type strains of these species were lower than 70 %. On the basis of the phenotypic, chemotaxonomic and molecular properties, strain H29T represents a novel species of the genus Rheinheimera, for which the name Rheinheimera aestuarii sp. nov. is proposed. The type strain is H29T (5KACC 18251T5JCM 30404T). © 2015 IUMS.

Kwun H.J.,National Marine Biodiversity Institute of Korea | Park J.,National Marine Biodiversity Institute of Korea | Kim H.S.,National Marine Biodiversity Institute of Korea
Marine Biodiversity | Year: 2016

We report the first record of partial albinism in Dictyosoma rubrimaculatum, collected from Jeju Island, Korea, in July 2015. This specimen has yellowish white coloration of the body, head, and all fins, except for dark stripes on the snout and anterior region of the opercle, dark blotches on the anterior tip of the lower jaw, black eyes, and small melanophores on the posterior region of the body. © 2016 Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg

Kwun H.J.,National Marine Biodiversity Institute of Korea | Kim J.-K.,Pukyong National University
Fisheries and Aquatic Science | Year: 2015

The Korean stichaeid fish “Min-be-do-ra-chi”, reported previously as Zoarchias glaber, is reviewed taxonomically and described based on a single specimen collected from Jeju Island, Korea. “Min-be-do-ra-chi” was identified as Z. major by the following morphological characteristics: U-shaped markings on the dorsal and anal fins, 31 dorsal fin spines, 78 dorsal fin soft rays, 87 anal fin soft rays, and 109 vertebrae. In contrast, Z. glaber has triangular markings on the dorsal and anal fins, 92-96 anal fin soft rays, and 112-122 vertebrae. Therefore, our results suggest that the scientific name of this species reported previously as Z. glaber should be changed to Z. major. © 2015 The Korean Society of Fisheries and Aquatic Science.

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