• Title/Summary/Keyword: Six species

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Two unrecorded marine nematode species of Paracanthonchus (Nematoda: Cyatholaimidae) from the East Sea of Korea

  • Lee, Hyo Jin;Jung, Jongwoo;Rho, Hyun Soo
    • Journal of Species Research
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    • v.5 no.3
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    • pp.503-513
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    • 2016
  • Two unrecorded marine nematode species, belonging to genus Paracanthonchus Micoletzky, 1924, are described on the basis of the specimens collected from rocky intertidal seagrass bed on the eastern coast of Korea. Paracanthonchus macrodon (Ditlevsen, 1918) is characterized by presence of cuticular differentiation, strongly dilated gubernaculum with numerous cusps, three post-cloacal setae, and arrangement of six (4+2) precloacal supplement. Paracanthonchus kamui Kito, 1981 is distinguished from other species of the genus by having the 4.25 turns amphideal fovea, six tubular supplement, rib-shaped gubernaculums with proximally hook-shaped and distally broaden. In this study, we provide taxonomic description and illustration of two unrecorded species of the genus Paracanthonchus by differential interference contrast microscopy. This is the first report on the species of the genus Paracanthonchus from Korea.

A study of six newly recorded species of cyanobacteria (Cyanophyceae, Cyanophyta) in Korea

  • Song, Mi-Ae;Lee, Ok-Min
    • Journal of Species Research
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    • v.6 no.2
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    • pp.154-162
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    • 2017
  • The aim of this study was to discover and describe new genera and species of cyanobacteria in Korea. Aquatic and aerial algae were collected from various environments in the Han River and Nakdong River watersheds between August 2009 and October 2015. As a result, one genus and six species of cyanobacteria were newly recorded in Korea. The newly recorded genus for Korea was Capsosira; newly recorded species were Capsosira brebissonii, Rivularia minutula, Chamaesiphon amethystinus, Leptolyngbya margaretheana, Pseudanabaena arcuata, and Rhabdoderma lineare.

First Report of Two Species of Mantid Shrimps (Stomatopoda: Squilloidea: Squillidae) from Korean Waters

  • Kang, Jung-Ha;Lee, Seok Hyun;Ko, Hyun Sook
    • Animal Systematics, Evolution and Diversity
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    • v.32 no.3
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    • pp.234-239
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    • 2016
  • Two species of mantid shrimps were collected from southern part of Korea and identified as Kempella mikado and Squilloides leptosquilla of the Squillidae. The former species is characterized by having a dactylus of the raptorial claw with six teeth, only the fifth thoracic somite with a single spinous lateral process, and the fifth abdominal somite with a pair of black dorsal patches. However, the latter species is characterized by having a dactylus of the raptorial claw with four teeth, and the fifth to seventh thoracic somites each with a single lateral process. Both species are described with figures and photographs. The present records are extensions of their geographical distributions and new records in Korea. Hence, a total of six species of the stomatopods have been recorded in Korea up to date: Oratosquilla oratoria, Faughnia formosae, Taku spinosocarinatus, Chorisquilla spinosissima, Kempella mikado, and Squilloides leptosquilla.

Review of the Genus Hypsicera (Hymenoptera: Ichneumonidae: Metopiinae) from South Korea

  • Kang, Gyu-Won;Choi, Jin-Kyung;Suh, Kyong-In;Lee, Jong-Wook
    • Animal Systematics, Evolution and Diversity
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    • v.32 no.3
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    • pp.184-196
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    • 2016
  • Hypsicera has been reported six species from South Korea. In this study, we reviewed 13 species of South Korean Hypsicera including seven newly recorded species from South Korea. Female of H. brevicornis and H. nigribasis are reported for the first time from South Korea since first record. Additionally, H. incarinata and H. yoshimoboi are reported new to China. We provide diagnoses of six newly recorded species and descriptions of two new females. We also provide photographs of key characters of seven newly recorded species and a key to 13 species of South Korean Hypsicera.

One New Species and One New Record of Electridae (Bryozoa: Cheilostomatida) from Korea

  • Hyun Sook Chae;Ho Jin Yang;Bum Sik Min;Ji Eun Seo
    • Animal Systematics, Evolution and Diversity
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    • v.40 no.1
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    • pp.73-78
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    • 2024
  • A taxonomic study of the family Electridae Stach, 1937 (Bryozoa: Cheilostomatida) was carried out using materials collected from six localities of Korea from 1984 to 2021. Aspidelectra melolontha (Landsborough, 1852) is newly added to the bryozoan fauna of Korea, and Electra jindoica n. sp. is new to science. European A. melolontha is known to occur in brackish water of low salinity, but the species is found in New Zealand and Argentina seawater. This species is also reported as a fouling bryozoan from China and New Zealand. Electra jindoica n. sp. is distinguished by smaller zooid, larger kenozooid, and developed cryptocyst from E. asiatica Grischenko, Dick and Mawatari, 2007. With the addition of two species reported herein, six species and four genera of Electridae from Korea have been recorded: Aspidelectra melolontha, Arbopercula tenella, Conopeum hexagonum, C. reticulum, C. seurati, and Electra jindoica n. sp. Furthermore, the genera Aspidelectra and Electra are new to the Korean bryozoan fauna based on this study.

The Decomposition of Leaf Litters of Some Tree Species in Temperate Deciduous Forest in Korea II. Changes in Nutrient Content During Litter Decomposition

  • Yang, Keum-Chul;Shim, Jae-Kuk
    • The Korean Journal of Ecology
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    • v.26 no.6
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    • pp.313-319
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    • 2003
  • Dry weight loss and nutrient release from leaf litter for six tree species were studied using litter bag methods. The litter bags were incubated for f6 months on the forest floor in temperate deciduous forest in Mt. Cheonma, located at the middle part of Korean Peninsula. The changes in nutrient content and the rate of dry weight loss in leaf litter varied with litter types. The litter of Pinus densiflora showed the lowest rate of mass loss (k=0.33), nitrogen concentration (0.89%) and ash concentration (2.50%), while showed the highest C/N ratio (63.40). On the other hand, the litter of Acer pseudo-sieboldianum showed the fastest rate of mass loss (k=0.82), the highest nitrogen concentration (1.11%), and the lowest C/N ratio (49.40). During the decomposition, nitrogen, phosphorus and calcium in the leaf litters showed relatively slow decreasing pattern compared to other elements (carbon, potassium, magnesium, manganese and sodium), but potassium and sodium decreased at early stage of the decomposition for all leaf litters. Differences in annual decomposition rates of litter among species were consistent with the particular chemical characteristics of their leaf litters. The initial concentration of nitrogen was positively correlated with litter decomposition rate for six species, while litter decomposition rate of six species was negatively correlated with C:N ratio of initial leaf litters.

Vertical nest stratification and breeding success in a six mixed-species heronry in Taeseong, Chungbuk, Korea

  • Park, Shi-Ryong;Kim, Kwan-Yong;Chung, Hoon;Choi, Yu-Seong;Sung, Ha-Cheol
    • Animal cells and systems
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    • v.15 no.1
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    • pp.85-90
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    • 2011
  • In 2001, we conducted a study to assess the effects of differential arrival times and nest-site selection on reproductive performance in a mixed-species heronry consisting of six species in Taeseong-ri, Chungbuk, Korea. We recorded the arrival dates, nest heights, clutch sizes, and brood sizes after 15-20 days of the age of the birds' chicks. The grey herons and cattle egrets arrived first and last, respectively, on the colony site. In the homogenous vegetation structure of the breeding site, the pitch pine trees (Pinus rigida) were mainly used for building nests on 48 of the 50 pine trees (96%). The breeding species vertically stratifies the nest sites according to their body size, except for the cattle egrets and black-crowned night herons that nested at sites higher than those predicted from their body size. The mean nest success rates of the six species under study were positively correlated with the mean nest heights. Our findings suggest that aggressive interspecific interactions among neighbors influence nest-site selection to enhance breeding success.

Phylogeny of Flavobacteria Group Isolated from Freshwater Using Multilocus Sequencing Analysis

  • Mun, Seyoung;Lee, Jungnam;Lee, Siwon;Han, Kyudong;Ahn, Tae-Young
    • Genomics & Informatics
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    • v.11 no.4
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    • pp.272-276
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    • 2013
  • Sequence analysis of the 16S rRNA gene has been widely used for the classification of microorganisms. However, we have been unable to clearly identify five Flavobacterium species isolated from a freshwater by using the gene as a single marker, because the evolutionary history is incomplete and the pace of DNA substitutions is relatively rapid in the bacteria. In this study, we tried to classify Flavobacterium species through multilocus sequence analysis (MLSA), which is a practical and reliable technique for the identification or classification of bacteria. The five Flavobacterium species isolated from freshwater and 37 other strains were classified based on six housekeeping genes: gyrB, dnaK, tuf, murG, atpA, and glyA. The genes were amplified by PCR and subjected to DNA sequencing. Based on the combined DNA sequence (4,412 bp) of the six housekeeping genes, we analyzed the phylogenetic relationship among the Flavobacterium species. The results indicated that MLSA, based on the six housekeeping genes, is a trustworthy method for the identification of closely related Flavobacterium species.

A report of 12 unrecorded bacterial species isolated from Suncheon Bay in Korea

  • Seok Won Jang;Jung Hye Eom;Sanghwa Park
    • Korean Journal of Environmental Biology
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    • v.40 no.4
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    • pp.405-412
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    • 2022
  • Suncheon Bay Ecological Park, possessing abundant fisheries and biological diversity, was registered as a Ramsar wetland in Korea. Approximately 300 bacterial strains were isolated from the Suncheon Bay in a comprehensive study of indigenous prokaryotic species conducted during 2019-2020 in South Korea. A total of 12 bacterial strains were identified using 16S rRNA gene sequencing, demonstrating >98.7% sequence similarity with validly published species. These species were determined to be unrecorded bacterial species in Korea. A total of six strains were isolated from brackish water and Phragmites communis Trin (reed) species. These unrecorded species were phylogenetically diverse and belonged to three classes, six orders, and ten genera. Regarding the genus and class levels, the previously unrecorded species belonged to Jiella, Martelella, Rhizobium, Paracoccus, Rhodovulum, and Altererythrobacter of the class Alphaproteobacteria; Mycolicibacterium, Demequina, and Microbacterium of the class Actinobacteria; Confluentibacter of the class Flavobacteria. The twelve species were further characterized by gram staining, colony and cell morphology, biochemical properties, and phylogenetic position.

Phytoplankton Studies in Korean Waters. III. Surface Phytoplankton Survey of the North-Eastern Korea Strait in May of 1967 (한국해역의 식물플랭크톤의 연구. III. 1967년 5월 북동부 한국해협 표층수의 식물플랭크톤의 양과 분포)

  • Choe, Sang
    • 한국해양학회지
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    • v.4 no.1
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    • pp.1-8
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    • 1969
  • Phytoplankton samples, collected about twenty day interval on May of 1967, at same twenty-one stations located in the north-eastern Korea Strait were examined in an attempt to determine the specific distribution and abundance of phytoplankton. Water bottle samples preserved with neutralized formula were used for the phytoplankton study. In May, water temperature and salinity show both lower at the sea of Korea side than that of Japan side, and both indicate gradually higher to the sea of Japan side. Fourty-six species of diatoms and three species of dinoflagellates in early May, and thirty-six species of diatoms and six species of dinoflagellates in the May were detected. Among them thirty species of diatoms and two species of dinoflagellates were appeared commonly in both cruise. Chaetoceros curvisetus and Rhizosolenia castracanei were wide distributed species, and Leptocylindrus danicus was the most numerous species at this sea in May. In generally, the sea of Korea side was more rich in species and numbers of phytoplankton.

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