• 제목/요약/키워드: brackish species

검색결과 181건 처리시간 0.03초

동해안의 기수호에서 채집된 잔벌레속 등각류(갑각류)의 1 신종 (A New Species of the Genus Gnorimosphaeroma (Crustacea, Isopoda, Sphaeromatidae) from a Brackishwater Lake in Korea)

  • 장인권;권도헌
    • 한국동물학회지
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    • 제36권3호
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    • pp.402-407
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    • 1993
  • 강원도 고성군의 해안에 위치한 기수호인 송지호에서 채집된 잔벌레속의 1 신종, Gnorimosphaeroma anchialos [국명: 기수잔벌레(신칭)]를 기재한다. 본 종은 흉절의 coxal plate와 제 1-2흉지의 형태에 의해서 유사종인 G. naktongense Kwon and Kim(낙동잔벌레) 및 G. hoestlandti Kim and Kwon(꼬마갯가잔벌레)와 구분된다.

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Intra- and Interspecific Variation in the Ribosomal Internal Transcribed Spacers and 5.8S rDNA among three species of Pseudodiaptomus (Calanoida, Pseudodiaptomidae) from Korean Estuarine Waters

  • Soh, Ho-Young;Suh, Hae-Lip;Yoon, Yang-Ho;Park, Sang-Duk;Kwon, Soon-Yoo
    • 한국어업기술학회:학술대회논문집
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    • 한국어업기술학회 2001년도 춘계 수산관련학회 공동학술대회발표요지집
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    • pp.437-438
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    • 2001
  • Species of the genus Pseudodiaptomus are reported as the major constituents in the fresh or brackish waters in the northeastern Asia (Suh et al., 1991; Oka et al., 1991). Of these species, P. inopinus (Burckhardt) and P. poplesia (Shen) are particularly numerous in spring and autumn (Suh et al., 1991; Shen and Song, 1979). Recently. we found a presence of two types of Pseudodiaptomus inopinus during the course of investigation on zooplankton from Korean estuaries. (omitted)

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New Record of Three Marine Ciliates (Protozoa, Ciliophora) from South Korea

  • Atef Omar;Ji Hye Moon;Jae-Ho Jung
    • Animal Systematics, Evolution and Diversity
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    • 제39권1호
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    • pp.1-9
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    • 2023
  • During a field survey of Korean marine ciliates, we collected three ciliate species from the eastern coastal waters of the Yellow Sea. Based on the observation of living and protargol and wet silver nitrate stained cells, the ciliates, belonging to the classes Spirotrichea and Oligohymenophorea, were identified as Cardiostomatella vermiformis (Kahl, 1928) Corliss, 1960, Parallelostrombidium paraellipticum Song et al., 2018, and Pleuronema paucisaetosum Pan et al., 2015. Both Parallelostrombidium paraellipticum and Pleuronema paucisaetosum were described only from their type localities, i.e., brackish water, suggesting that they tolerate a broad range of salinity, while Cardiostomatella is marine ciliate and seems to be cosmopolitan. These three species were reported for the first time in Korea. Brief descriptions, remarks to justify their identity and to compare the present isolates with similar taxa, and photomicrographs were provided for the three species.

한국산 곤쟁이, (갑각망:곤쟁이목)의 생물학적 연구 1. 분류학적인 기재 (The Biology of Neomysis awatschensis (Crustacea: Mysidacea) in Korea. 1. Systematics)

  • 유광일;최승민
    • 한국해양학회지
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    • 제20권2호
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    • pp.61-66
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    • 1985
  • 한국산 공쟁이의 일종으로 남해안에서 서해안 일대의 기수호, 하구역 및 염전 에 널리 분포하고 있는 Neomysis awatschensis(Brandt)의 분류학적 기재와 함께 본 종을 한국산 미기록종으로 발표한다. 아울러 본종의 세계적인 분포에 대한 논의 와 함께 분포지수를 추가한다.

First Record of Two Urostyloid Ciliates (Spirotrichea: Urostylida: Urostyloidea) from Brackish Water in Korea

  • Choi, Jung-Min;Kim, Ji-Hye;Shin, Mann-Kyoon
    • Animal Systematics, Evolution and Diversity
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    • 제27권3호
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    • pp.228-238
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    • 2011
  • Two urostyloid ciliates, collected from brackish water in Korea, were identified as Diaxonella pseudorubra pseudorubra (Kaltenbach, 1960) Berger, 2006 and Pseudokeronopsis flava (Cohn, 1866) Wirnsberger, Larsen and Uhlig, 1987. The description was based on living, protargol impregnated specimens. These species are described as follows: Diaxonella pseudorubra pseudorubra: body size in vivo $145-230{\times}40-60\;{\mu}m$, elongated ellipsoidal in shape. Cytoplasm reddish and flexible. Adoral zone of membranelles occupied 30-40% of the body; composed of 33-44 membranelles; 1-3 frontoterminal cirri, 1-4 frontal row cirri, 4-6 buccal cirri, 6-10 transverse cirri. Midventral rows composed of 14-24 cirri, four left marginal rows, one right marginal row. Two kinds of cortical granules; the larger one is yellowish and the smaller one is reddish. Pseudokeronopsis flava: body size in vivo $150-210{\times}30-45\;{\mu}m$, elongated ellipsoidal shape. Cytoplasm yellowish and flexible. Adoral zone of membranelles occupied 25-30% of body; composed of 44-58 membranelles in number. Frontal cirri forming bicorona composed of 5-7 cirral pairs, 2-3 frontoterminal cirri, one buccal cirrus, and 2-3 transverse cirri. Midventral rows composed of 18-33 cirri, 34-53 left marginal cirri, and 40-58 right marginal cirri. Two kinds of cortical granules; the larger one is colorless and "blood-cell-shaped," and the smaller one is yellowish. Diaxonella pseudorubra pseudorubra is different from the most similar subspecies, D. pseudorubra pulchra, in cytoplasmic color and number of midventral cirri. Pseudokeronopsis flava is different from its most similar congeners in pigment granular color, number of bicorona, number of midventral cirri, and position of the contractile vacuole.

Pre-Monsoon Dynamics of Zooplankton Community in the Downstream of the Gagok Stream, Eastward into the East Sea, Korea

  • Kim, Saywa
    • 환경생물
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    • 제33권2호
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    • pp.223-229
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    • 2015
  • Pre-monsoon dynamics of zooplankton community were investigated in the downstream of the Gagok stream flowing into the East Sea of Korea. Monthly sampling was carried out to collect zooplankters at five sites in the stream during the period between April and July 2014. Dissolved oxygen contents exceeded $7.0mg\;L^{-1}$ all the time. Water temperature was in a range of 15.7 to $24.9^{\circ}C$ and pH 7.4 to 8.8, respectively. A total of 75 taxa consisted of 36 species of rotifers, 16 species of cladocerans, 16 species of copepods, four kinds of aquatic insects, two kinds of decapods and one nematod was occurred. One species of marine copepod and one cladoceran, and one species of brackish rotifer and one copepod distributed at the station located in the stream mouth. Zooplankton abundance showed to vary from 42 to 4202 individuals $m^{-3}$ due to the explosion of aquatic insects and Alona sp. at site 2 located in the downstream in April. Heavy rainfall during the monsoon period seems to decrease the zooplankton abundance caused by diffusion and drifting to the sea. Species diversity indices were generally high between 1.2~2.3 and were recorded to be high at the downstream throughout the study period. With the zooplankton dynamics, the influence of the input of sea waters into the stream seemed to be confined to some hundred meters of the stream mouth facing the East Sea.

Ultrastructural and Molecular Characterization of Surirella atomus Hustedt 1955 (Bacillariophyta, Surirellalceae), A Newly Recorded Species in Korea

  • An, Sung Min;Noh, Jae Hoon;Kim, Ji Hoon;Kang, Nam Seon
    • Ocean and Polar Research
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    • 제43권4호
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    • pp.245-253
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    • 2021
  • Surirella atomus Hustedt 1955, surirelloid diatom, were obtained from Hampyeong Bay, Mu-an, in the west coast of Korea. We describe the first record of S. atomus in Korea and report its ultrastructure and molecular characteristics for the first time. For molecular analysis, rbcL gene and cob gene were sequenced. This species is very small in size, making it difficult to observe its morphological features under a light microscope. Even with a scanning electron microscope, it has no unique structure in the valve. It is morphologically very simple. This rare species was known as a marine benthic species. However, it appears to be widely distributed in marine, freshwater, and brackish environments according to the literature documenting this species. In terms of phylogeny, S. atomus has been tentatively linked to Petrodictyon gemma, but the phylogenetic placement of S. atomus seems to be still uncertain, in a manner that is similar to S. febigeri. However, morphological observations derived from this study suggest that this species belongs to the genus Surirella.

Cercaria caribbea LVIII Cable, 1963 (Digenea: Cyathocotylidae) in the Republic of Korea and Its Surface Ultrastructure

  • Han, Eun-Taek;Park, Jeong-Hyun;Chai, Jong-Yil
    • Parasites, Hosts and Diseases
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    • 제50권2호
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    • pp.177-180
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    • 2012
  • Cercaria caribbea LVIII Cable, 1963 (Digenea: Cyathocotylidae) was detected from a brackish water gastropod species (Cerithideopsilla cingulata) in a coatal area of Shinan-gun, Jeollanam-do (Province), the Republic of Korea, and its surface ultrastructure was studied using a scanning electron microscope. The cercariae were found freely swimming or enveloped within daughter sporocysts when the snail host was mechanically broken. They were morphologically characterized by a linguiform and ventrally concave body, a long and bifurcated tail, and the presence of a holdfast (=tribocytic) organ posterior to the ventral sucker. On the whole ventral and dorsal surfaces, peg-like tegumental spines were densely distributed. Around the oral sucker, several sensory papillae, each with a short cilium, were distributed, and on the tail, sensory papillae, each with an extensively long cilium, were observed. This is the first record describing a cyathocotylid cercaria from a brackish water gastropod in the Republic of Korea.

Antagonistic and Plant Growth Promoting Activity of Bacillus species Isolated from Brackish Environment

  • Kamala-Kannan, Seralathan;Lee, Kui-Jae;Oh, Byung-Taek
    • 한국자원식물학회:학술대회논문집
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    • 한국자원식물학회 2010년도 정기총회 및 춘계학술발표회
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    • pp.6-6
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    • 2010
  • Bacteria of the Bacillus sp. are well known to possess antagonistic activity against numerous plant pathogens. In the present study, 11 Bacillus sp. were isolated from the brackish environment and assayed for antagonistic activity under in vitro and in vivo conditions. Among the 11 isolates tested, 9 isolates effectively inhibited the growth of various plant pathogens, namely Phytophthora capsici, Phytophthora citropthora, Phytophthora citricola, Phytophthora sojae, Colletotricum coccodes, Colletotricum gloeosporioides, Colletotricum acutatum, Rhizoctonia solani, Fusarium solani, Fusarium graminearum, Pyricularia sp. and Monilina sp. The effective isolates were further screened for Phytophthora blight suppression in Capsicum annuum L. under green house conditions. The isolate SB10 exhibited the maximum (72.2%) reduction in disease severity. The antifungal compounds from the isolate were isolated and characterized. The isolated compounds exhibited high thermo stability ($100^{\circ}C$ for 30 min). Matrix-Assisted Laser Desorption Ionization-Time of Flight investigation of the antifungal compounds revealed three lipopeptide complexes, the surfactins, the iturins, and the fengycins.

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미세조류의 종류와 농도에 따른 기수산 cyclopoid 요각류 Paracyclopina nana의 섭식 (Grazing of Brackish Water Cyclopoid Copepod Paracyclopina nana on Different Microalgae Species and Concentrations)

  • 민병희;박흠기;허성범
    • 한국양식학회지
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    • 제19권4호
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    • pp.310-314
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    • 2006
  • 본 연구는 기수산 cyclopoid 요각류인 Paracyclopina nana의 먹이 종류와 농도에 따른 섭식률을 조사하였다. 먹이 공급 24 시간 후 먹이의 종류와 농도에 따른 P. nana의 장내용물 함량과 섭취된 먹이의 양을 색소분석 방법으로 조사하였다. T. suecica는 30 ng chl a/ml, I. galbana와 D. tertiolecta는 40 ng chl a/ml, P. tricornutum는 45 ng chl a/ml 농도로 공급하였을 때 섭취된 먹이의 양과 P. nana의 장내용물 함량이 가장 높았다. T. suecica, I. galbana, P. tricornutum, 그리고 D. tertiolecta에 대한 P. nana 성체 1 개체의 시간당 최대 섭식률은 각 미세조류의 공급 농도가 각각 39.3, 44.7, 44.5와 49.8 ng chl a/ml일 때 각각 0.63, 0.60, 0.41 및 0.52 ng chl a로 나타났다. 따라서 P. nana의 대량배양시 가장 적합한 먹이생물은 공급 농도가 낮으면서도 섭식률이 가장 높은 T. suecica이며, 성체 1 개체당 1일 먹이 공급량은 약 $25{\sim}39$ ng chl a (약 $10{\sim}15{\times}10^4$ cells)가 가장 경제적일 것으로 판단된다.