• Title/Summary/Keyword: Ciliates

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Two Newly Recorded Ciliates, Oxytricha longigranulosa and o. marina (Ciliophora: Spirotrichea: Sporadotrichida) from Korea

  • Kwon, Choon-Bong;Shin, Mann-Kyoon
    • Animal Systematics, Evolution and Diversity
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    • v.24 no.1
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    • pp.81-88
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    • 2008
  • Two oxytrichid ciliates collected from the mosses and estuarine littoral in Korea were identified as Oxytricha longigranulosa Berger and Foissner, 1989 and O. marina Kahl, 1932. These species are reported for the first time from Korea. The description was based on living and protargol impregnated specimens. Diagnostic characters for each species are as follows. Oxytricha longigranulosa: Cell in vivo $80-115{\times}30-50{\mu}m$, mostly $90{\times}40{\mu}m$. Length/width ratio about 2.4/1. Cortical granules about $1{\times}1.5{\mu}m$ in size, colorless, arranged in short and discontinued longitudinal rows. Four frontoventral cirri. Adoral zone of membrane lies (AZM) covering 30-50% of cell length with 25-27 adoral membranelles (AM). Buccal area flat, typical Oxytricha pattern. Five transverse cirri, 19-23 right marginal cirri, 19-24 left marginal cirri, three caudal cirri, five dorsal kineties. Two macronuclear nodules 2 in number and spherical in shape, two micronuclei in number. Oxytricha marina: Cell in vivo $100-150{\times}30-60{\mu}m$. Cytoplasm colorless without cortical granules. Four frontoventral cirri. AZM covering 50% of cell length with 28-44 AMs, Buccal area flat, typical Oxytricha pattern. Five transverse cirri, 23-38 right marginal cirri, 19-25 left marginal cirri, three caudal cirri, five dorsal kineties. Two macronuclear nodules and spherical in shape, 1-5 micronuclei, mostly two in number.

Several Hypotrichous Ciliates Inhabiting the Han River in Seoul (서울지역 한강에 서식하는 하모섬유충류)

  • 신만균;김훈수
    • Animal Systematics, Evolution and Diversity
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    • no.nspc2
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    • pp.67-85
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    • 1988
  • The hypotrichous ciliates (Protozoa , Ciliophora, Hypotrichida) inhabiting the Han River in Seoul were systematically investigated. Several Collections were made from 6 November 1986 to 8 November 1987 at 9 sites located in the Han River. Collected protozoans were cultured and characterized cyto-morphologically under the living and/or stained conditions, As a result, 7 species of hypotrichs in 4 families were identified of which 3 species are newly recorded from Korea ; Paraurostyla weissei (Stein, 1859_, Aspidisca cicada(O.F. Mller, 1786) and Euplotes patella (O.f.Mller, 1773). The identified species were redescribed with illustrations and photographs. The morphological similarities among them were numerically analyzed by UPGMA method, and its result of clustering concurs in general with the orthodox classification scheme.

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Redescription of Previously Unknown Euplotine Ciliates, Euplotes charon and Diophrys oligothrix (Ciliophora: Spirotrichea: Euplotida), from Korea

  • Kwon, Choon-Bong;Shin, Mann-Kyoon
    • Animal Systematics, Evolution and Diversity
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    • v.22 no.1
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    • pp.29-35
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    • 2006
  • Two ciliates of suborder Euplotina collected from the two habitats (estuarine littoral and sewage treatment plant) in Ulsan, Korea were Euplotes charon ($M\ddot{u}ller$, 1773) and Diophrys oligothrix Borror, 1965. These two species are reported for the first time from Korea. The description was based on the observation of living and silver impregnated specimens. Diagnostic characteristics of these species are as follows. E. charon: size in vivo about $90-130\times65-80{\mu}m$, adoral zone of membranelles over 79.5% of cell length with 54-80 adoral membranelles; right margin of the peristome shaped sinusoidal form and passed through adoral zone of membranelles; buccal cavity wide anteriorly; 10 frontoventral, 5 transverse, 4 caudal cirri, 12 dorsal kineties, mid-dorsal kinety with 21 -25 dorsal bristles; silver-line system double-eurystomus type. D. oligothrix: size in vivo about $80-90\times30-70{\mu}m$; body shape ovoid with prominent right concave posterio-lateral end, two irregular elongated macronuclei with one micronucleus, respectively; 7 fronto-ventral, 5 transverse, 2 left marginal and 2 caudal cirri, 4 dorsal kineties with prominent bristles about $9-14{\mu}m$ long in vivo.

Two Litonotid Ciliates (Ciliophora: Litostomatea: Pleurostomatida) Unknown from Korea

  • Lee, Jung-Mi;Yoon, Jae-Sool;Shin, Mann-Kyoon
    • Animal Systematics, Evolution and Diversity
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    • v.22 no.2
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    • pp.223-229
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    • 2006
  • Two litonotid ciliates collected from the freshwater habitats in Korea were identified as Loxophyllum meleagris ($M\ddot{u}ller$, 1773) and Siroloxophyllum utriculariae (Penard, 1922). The description was based on the observation of living and protargol impregnated specimens, and biometric analysis. Their diagnostic characteristics are as follows. L. meleagris; $163-480\times80-100{\mu}m$ in vivo, body shape lancet or knife-like; dorsal margin with 10-19 extrusome warts; 8-35 macronuclei nodules, like a string of bead; 16-21 somatic kineties on right side (including perioral kinety 2, 3) and 6-11 on left side (including perioral kinety 1); 1 contractile vacuole located at posterior part at diastole stage, extending along the dorsal margin toward anterior end with a single long narrow canal. S. utriculariae; $110-170\times78-150{\mu}m$ in vivo, body shape lancet like; dorsal margin without extrusome warts; 2 macronuclei, spherical; 12-19 somatic kineties on right side, 3-7 on left side (including perioral kinety 1); 2-3 contractile vacuoles, first one located anterior ventrally, second one located posterior dorsally and last one located near posterior end of cell.

Cryptocaryoniasis of cultured flounder, Paralichthys olivaceus in low temperatures (저수온 양식 넙치 Paralichthys olivaceus의 Cryptocaryoniasis)

  • Ji, Bo-Young;Kim, Ki-Hong;Park, Soo-Il
    • Journal of fish pathology
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    • v.10 no.2
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    • pp.97-111
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    • 1997
  • In the winter of 1995, mass mortality occurred in cultured flounder, Paralichthys olivaceus in Gurongpo, Kyoungbuk, Korea. From the observations of moribund and dead fish, parasitic ciliates, which were shown as white spots to the naked eye, were considered to be involved in the mass mortality. From heavily infected flounders, histopathological, morphological and biological characterization of these ciliates were carried out. In the histological observation, many ciliates were found under the epithelia of gill filaments and skin, and caused hyperplasia of epithelial and mucus cells at the infected areas. The ciliates found on the body surface, fins and gills were very similar to Cryptocaryon irritans. However the ciliates showed two different patterns of reproductian, i.e., typical form(palintomy)and atypical form(budding plus multiple fission) at $16^{\circ}C$ of water temperature. The occurrence ratio between typical and atypical form was about 3:2. Tomitogenesis takes 8-14 days in the typical and 13-15 days in the atypical form. In the viability test at different temperatures and salinities, the typical form died below 30‰ at $12^{\circ}C$, below 20‰ at $16^{\circ}C$, below 15‰ at $20^{\circ}C$, and below 25‰ at $24^{\circ}C$, respectively. On the other hand, the atypical form died below 20‰ at $12^{\circ}C$, below 15‰ at 16-$20^{\circ}C$, and below 25‰ at $24^{\circ}C$, respectively. The results suggested that the atypical has better viability at low salinity than that of the typical at low temperatures. In the excystment time and success rates of excystment according to temperatures, the typical form showed 8 days, 30% at $12^{\circ}C$ : 6.5 days, 50%, at $16^{\circ}C$ : 5.5 days, 75% at $20^{\circ}C$ : and 7 days, 10% at $24^{\circ}C$, respectively. On the other hand, the atypical form showed 15.5 days at $12^{\circ}C$ : 14 days, 76.6% at $16^{\circ}C$ : 12 days, 72.2% at $20^{\circ}C$ : 10 days 31.6% at $24^{\circ}C$, respectively. The results suggested that the atypical form had longer excystment time than that of the typical form at any temperature and showed better stability at low temperatures.

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Temporal and Spatial Distribution of Biomass and Cell Size of Bacteria and Protozoa in Lake Paldang and Kyungan Stream (팔당호와 경안천에서 박테리아와 원생생물의 생물량과 세포크기의 시 ${\cdot}$ 공간적 분포)

  • Son, Ju-Youn;Kong, Dong-Soo;Hwang, Soon-Jin
    • Korean Journal of Ecology and Environment
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    • v.39 no.3 s.117
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    • pp.378-389
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    • 2006
  • Seasonal changes of biomass and cell size of bacteria and protozoa, and factors affecting their distribution in Lake Paldang and Kyungan Stream were analyzed from April to December, 2005. Bacterial abundance at Paldang Dam and Kyungan Stream was similar, but it did not much increase during hot summer period. Protozoan carbon biomass was much greater at Kyungan Stream compared to Paldang Dam. HNAN generally accounted for the majority of total protozoan biomass, but ciliates made up the highest proportion in April and November at Paldang Dam and June at both sites. PNAN showed low biomass at both sites, but it was high during spring and fall season. Small-sized HNAN ($3{\sim}7\;{\mu}m$) numerically predominated the protozoan community at both sites. Average cell size of HNAN was bigger at Kyungan Stream where nutrients concentration was much higher than Paldang Dam. Average cell size of ciliates varied seasonally; it was relatively small during the summer. HNAN biomass significantly correlated with Chl-a concentration and ciliates biomass at Paldang Dam, indicating that HNAN increase might link to the ciliates increase. At Kyungan Stream, HNAN biomass showed a significant relationship with PNAN biomass, and Chl-a concentration was closely related with both of HNAN and PNAN biomass. Ciliate biomass showed significant relationship with nutrient (TN, TP) and particulate matter (SS) only at Kyungan Stream. At both sites, protozoan biomass was significantly correlated with bacterial biomass, and ciliates were additionally related flagellates. High biomass of microbial components and the close relationships among them suggest that the energy transfer through the microbial loop may important in the plankton food web of Lake Paldang ecosystem.

Characteristic of Seasonal Dynamics of Planktonic Ciliates at Four Major Ports (Busan, Ulsan, Gwangyang and Incheon), Korea (한국의 4개 주요항만(부산, 울산, 광양, 인천)에 분포하는 섬모충 플랑크톤의 계절동태 특성)

  • Yang, Seung-Woo;Lee, Joon-Baek;Kim, Young-Ok
    • Korean Journal of Environmental Biology
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    • v.36 no.2
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    • pp.217-231
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    • 2018
  • Planktonic ciliates play an important role in the food web of marine ecosystem as well as a bio-indicator for invasive species from ballast waters or from changing flow of ocean currents due to climate changes. This study was carried out to find some evidences for introduction of such invasive species using ciliate plankton in four major international ports of Korea. We surveyed the seasonal species composition of planktonic ciliate to find out the evidence for the invasive species at Busan, Ulsan, Gwangyang and Incheon ports from February 2007 to November 2008. A total of 45 ciliates species, belonging to 15 genera, were identified during the study period: 33 species occurred at Busan, 31 at Gwangyang, 30 at Ulsan, 18 at Incheon. The abundance of naked ciliates ranged from 566 to $65,151cells\;L^{-1}$ and that of tintinnids 10 to $5,973cells\;L^{-1}$. Based on vector species of ciliates reported from Coos Bay in Oregon, 13 vector species of tinitinnids were identified as follows, Eutintinnus lususundae, E. tubulosus, Favella ehrenbergii, F. taraikaensis, Helicostomella subulata, Stenosemella nivalis, Tintinnopsis ampla, T. beroidea, T. cylindrica, T. directa, T. lohmanni, T. radix, T. rapa. All vector species occurred at Gwangyang port. Most tintinnids were mainly neritic species throughout the survey, while warm water species occurred only in short period at Busan, Ulsan and Gwangyang ports that might be affected seasonally by Tsushima warm current.

Characteristics of ecological structure and spatial distribution of micro-plankton in relation to water masses in the northern East China Sea(nECS) in summer 2019 (2019년 여름 동중국해 북부해역의 수괴 분포에 따른 미소플랑크톤의 공간분포 및 생태구조 특성)

  • Yoon, Yang Ho;Park, Ji Hye;Lee, Hyeon Ji;Soh, Ho Young
    • Korean Journal of Environmental Biology
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    • v.38 no.3
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    • pp.355-370
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    • 2020
  • We conducted a field survey to analyze the ecological structure and spatial distribution of microplankton (phytoplankton and ciliates) in relation to water masses at 21 stations on the surface and chlorophyll-a maximum layers (CML) in the Northern East China Sea (nECS; 32°-33°N; 124°00'-127°30'E) from August 3 to August 6, 2019. The results showed that the water masses were divided into Chinese Coastal Waters (CCW) and the Tsushima Warm Current (TWC). The CCW showed the environmental characteristics of high temperature and low salinity, and the TWC showed high temperature and high salinity. The characteristics of the phytoplankton community in the CCW showed various community structures related to the nutrients supplied from the large rivers of the Chinese continent. However, the TWC had simple community structures because it originated near the equator and moved northward. The standing crops of phytoplankton and ciliates were very high in the CCW but showed low at the TWC. In particular, from the higher standing crops of protozoa than plant plankton at the TWC, the energy flow at the lower tropic levels caused by the microbial loop that fed on heterotrophic bacteria played an important role in the production of resource organisms. In other words, the marine ecological structure of the nECS in summer could be estimated as a bottom-up system at the CCW and a top-down system at the TWC.

Chilodonella hexasticha(Protozoa, Ciliata) from Korean freshwater fish (한국산 담수 어류에 기생하는 Chilodonella hexaticha에 관하여)

  • Ji, Bo-Young;Kim, Ki-Hong;Park, Soo-Il
    • Journal of fish pathology
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    • v.9 no.2
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    • pp.113-118
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    • 1996
  • During a study to document more fully the parasitic ciliates of Korean freshwater fishes, we found numerous small ciliates in the gills and skin of crucian carp, Carassius carassius. Cursory examination indicated that the ciliate were very similar with Chilodonella sp. In this study, we described the morphometrics of this ciliate in detail and compared with other species of Chilodonella in the world. Numerous small ciliates were observed in the body surface, fins and gills of infected fish and excessive mucus production were seen in those fish. Sometimes ulcer was observed in the body of moribund fish. From the scrutinized observation of the parasite, it was identified as Chilodonella hexasticha. The parasite was dorsoventrally flattened body, without a notch in the posterior margin, and it measured 30-$45{\mu}m$ long and 15-$30{\mu}m$ wide. In number of kineties, the right band ciliature was 3-5 and the left band ciliature was 3-5. The right ventral ciliary band shaped arch and was longer than the left, straight band. It had a single oval macronucleus, 8-$15{\mu}m$ in diameter, a single micronucleus, 2-$4{\mu}m$ in diameter. The cytopharynx was reinforced by 10-16 conspicuous nematodesmata, which shaped like a tube and curved at its inner end. Two contractile vacuoles, one anteriorly at right and the second posteriorly at left were observed in wet mounts. This parasite reproduced by a simple division at $22{\pm}1^{\circ}C$.

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Ingestion rate and grazing impact by the mixotrophic ciliate Mesodinium rubrum on natural populations of marine heterotrophic bacteria in the coastal waters of Korea

  • Seong, Kyeong Ah;Myung, Geumog;Jeong, Hae Jin;Yih, Wonho;Kim, Hyung Seop;Jo, Hyun Jung;Park, Jae Yeon;Yoo, Yeong Du
    • ALGAE
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    • v.32 no.1
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    • pp.47-55
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    • 2017
  • We explored feeding by the mixotrophic ciliate Mesodinium rubrum, heterotrophic nanoflagellates (HNFs), and small ciliates (<$30{\mu}m$ in cell length) on natural populations of heterotrophic bacteria in Masan Bay, Keum River Estuary, and in the coastal waters of the Saemankeum area, Korea when M. rubrum red tides occurred. We also measured ingestion rates of M. rubrum on cultured heterotrophic bacteria as a function of bacterial concentration in the laboratory. The ingestion rates of M. rubrum on natural populations of heterotrophic bacteria (2.3-16.8 bacteria $grazer^{-1}h^{-1}$) were comparable to or lower than those of co-occurring HNFs (10.7-41.7 bacteria $grazer^{-1}h^{-1}$), but much lower than those of co-occurring small ciliates (76.0-462.2 bacteria $grazer^{-1}h^{-1}$). However, the maximum grazing coefficient of M. rubrum ($0.245d^{-1}$) on natural populations of heterotrophic bacteria was much higher than that of small ciliates ($0.089d^{-1}}$), and slightly higher than that of HNFs ($0.204d^{-1}$). With increasing bacterial concentrations, ingestion rates of M. rubrum on cultured heterotrophic bacteria continuously increased, but became saturated at higher prey concentrations over $1-5{\times}10^6cells\;mL^{-1}$. The maximum ingestion rate of M. rubrum on cultured heterotrophic bacteria was 34.4 bacteria $grazer^{-1}h^{-1}$. Based on the present study, it is suggested that M. rubrum may be an important grazer of heterotrophic bacteria and sometimes have considerable grazing impact on natural populations of heterotrophic bacteria.