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首页> 外文期刊>Harmful Algae >Feeding and grazing impact by the bloom-forming euglenophyte Eutreptiella eupharyngea on marine eubacteria and cyanobacteria
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Feeding and grazing impact by the bloom-forming euglenophyte Eutreptiella eupharyngea on marine eubacteria and cyanobacteria

机译：形成水华的真生植物真叶假单胞菌对海洋真细菌和蓝细菌的进食和放牧影响

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摘要

The phototrophic euglenophyte Eutreptiella eupharyngea often causes blooms in the coastal waters of many countries, but its mode of nutrition has not been assessed. This species has previously been considered as exclusively auxotrophic. To explore whether E. eupharyngea is a mixotrophic species, the protoplasm of E. eupharyngea cells were examined using light, epifluorescence, and transmission electron microscopy after eubacteria, the cyanobacterium Synechococcus sp., and diverse algal species were provided as potential prey. Furthermore, the ingestion rates of E. eupharyngea KR on eubacteria or Synechococcus sp. as a function of prey concentration were measured. In addition, grazing by natural populations of euglenophytes on natural populations of eubacteria in Masan Bay was investigated. This study is the first to report that E eupharyngea is a mixotrophic species. Among the potential prey organisms offered, E. eupharyngea fed only on eubacteria and Synechococcus sp., and the maximum ingestion rates of these two organisms measured in the laboratory were 5.7 and 0.7 cells predator(-1) h(-1), respectively. During the field experiments, the maximum ingestion rates and grazing impacts of euglenophytes, including E. eupharyngea, on natural populations of eubacteria were 11.8 cells predator(-1) h(-1) and 1.228 d(-1), respectively. Therefore, euglenophytes could potentially have a considerable grazing impact on marine bacterial populations. (C) 2018 Elsevier B.V. All rights reserved.
机译：在许多国家的沿海地区，光养的食藻类真细菌常绿芽孢杆菌常引起花开，但其营养方式尚未得到评估。该物种以前被认为是唯一的营养缺陷型。为了探索真核大肠杆菌是否为混合营养物种，在真细菌，蓝细菌Synecoococcus sp。和各种藻类作为潜在的猎物之后，使用光，落射荧光和透射电子显微镜检查了真核大肠杆菌细胞的原生质。此外，真细菌或真核球菌sp。eupharyngea KR的摄入速率。测量作为猎物浓度的函数。此外，还研究了马山湾自然裸藻类种群对真细菌自然种群的放牧。这项研究是第一个报道真叶汉口咽虫是混合营养物种。在提供的潜在猎物生物中，仅以真细菌和Synechococcus sp。为食的真核大肠杆菌，在实验室中测得的这两种生物的最大摄食率分别为捕食者（-1）h（-1）和0.7细胞。在田间实验中，包括真核肠杆菌在内的真核生物对自然细菌的最大摄食率和放牧影响分别为11.8个细胞predator（-1）h（-1）和1.228 d（-1）。因此，裸藻植物可能会对海洋细菌种群产生相当大的放牧影响。 （C）2018 Elsevier B.V.保留所有权利。

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  • 来源
    《Harmful Algae》 |2018年第3期|98-109|共12页
  • 作者

    Yoo Yeong Du; Seong Kyeong Ah; Kim Hyung Seop; Jeong Hae Jin; Yoon Eun Young; Park Jaeyeon; Kim Jong Im; Shin Woongghi; Palenik Brian;

  • 作者单位

    Kunsan Natl Univ, Dept Marine Biotechnol, Coll Ocean Sci & Technol, Kunsan 54150, South Korea;

    Kunsan Natl Univ, Dept Marine Biotechnol, Coll Ocean Sci & Technol, Kunsan 54150, South Korea;

    Kunsan Natl Univ, Dept Marine Biotechnol, Coll Ocean Sci & Technol, Kunsan 54150, South Korea;

    Seoul Natl Univ, Sch Earth & Environm Sci, Coll Nat Sci, Seoul 08826, South Korea;

    Adv Inst Convergence Technol, Environm & Resource Convergence Ctr, Suwon 16229, South Korea;

    Adv Inst Convergence Technol, Environm & Resource Convergence Ctr, Suwon 16229, South Korea;

    Chungnam Natl Univ, Dept Biol, Daejeon 34134, South Korea;

    Chungnam Natl Univ, Dept Biol, Daejeon 34134, South Korea;

    Univ Calif San Diego, Scripps Inst Oceanog, Marine Biol Res Div, La Jolla, CA 92093 USA;

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  • 正文语种 eng
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  • 关键词

    Ecology; Food web; Algal bloom; Mixotrophy; Red tide; Synechococcus;

    机译：生态学;食物网;藻华;混合营养;赤潮;拟南芥;

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