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首页> 外文期刊>Harmful Algae >Harmful algal blooms of Heterosigma akashiwo and environmental features regulate Mesodinium cf. rubrum abundance in eutrophic conditions
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Harmful algal blooms of Heterosigma akashiwo and environmental features regulate Mesodinium cf. rubrum abundance in eutrophic conditions

机译：异源性的有害藻类盛开盛开和环境特征调节甲二醇。抑制在富营养化条件下的丰富

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摘要

Functional drivers of phytoplankton that can potentially form harmful algal blooms (HABs) are important to understand given the increased prevalence of anthropogenic modification and pressure on coastal habitats. However, teasing these drivers apart from other influences is problematic in natural systems, while laboratory assessments often fail to replicate relevant natural conditions. One such potential bloom-forming species complex highlighted globally is Mesodinium cf. rubrum, a planktonic ciliate. This species occurs persistently in the Sundays Estuary in South Africa yet has never been observed to "bloom" ( 1,000 cell.ml-1). Modified by artificial nutrient-rich baseflow conditions, the Sundays Estuary provides a unique Southern Hemisphere case study to identify the autecological drivers of this ciliate due to artificial seasonally "controlled" abiotic environmental conditions. This study utilised a three-year monitoring dataset (899 samples) to assess the drivers of M. cf. rubrum using a generalised modelling approach. Key abiotic variables that influenced population abundance were season and salinity, with M. cf. rubrum populations peaking in summer and spring and preferring polyhaline salinity regions (18) with pronounced water column salinity stratification, especially in warmer months. This was reflected in the diel vertical migration (DVM) behaviour of this species, demonstrating its ability to utilise the optimal daylight photosynthetic surface conditions and high-nutrient bottom waters at night. The only phytoplankton groups clearly associated with M. cf. rubrum were Raphidophyceae and Cryptophyceae. Although M. cf. rubrum reflects a niche overlap with the dominant HAB-forming phytoplankton in the estuary (the raphidophyte, Heterosigma akashiwo), its reduced competitive abilities restrict its abundance. In contrast, the mixotrophic foraging behaviour of M. cf. rubrum exerts a top-down control on cryptophyte prey abundance, yet, the limited availability of these prey resources (mean 300 cells ml 1) seemingly inhibits the formation of red-water accumulations. Hydrodynamic variability is necessary to ensure that no single phytoplankton HAB-forming taxa outcompetes the rest. These results confirm aspects of the autecology of M. cf. rubrum related to salinity associations and DVM behaviour and contribute to a global understanding of managing HABs in estuaries.
机译：浮游植物的功能司机可以潜在地形成有害的藻类盛开（HABS）对于鉴于沿海栖息地的人为改性和压力的普及增加，可以理解。然而，在自然系统中，除了其他影响之外，这些司机在自然系统中存在问题，而实验室评估通常无法复制相关的自然条件。全球突出的一种这种潜在的盛开形成物种复合物是Mesodininium CF. rubrum，浮游纤毛。该物种在南非的星期日河口持续存在，但从未被观察到“盛开”（1000个Cell.ML-1）。周日河口通过人工营养丰富的基流条件进行了修改，提供了独特的南半球案例研究，以确定由于人工季节性“受控”非生物环境条件而识别这一纤维化的自身生态驱动因素。本研究利用了三年监测数据集（899个样本）来评估M.CF的司机。 rubrum使用广义建模方法。影响人口丰富的主要非生物变量是季节和盐度，用M. Rubrum群体在夏季和春季达到峰值，并漂亮多卤素盐度区域（> 18），具有明显的水柱盐度分层，特别是在较温暖的月份。这反映在该物种的DIEL垂直迁移（DVM）行为中，展示其在夜间利用最佳日光光合表面条件和高营养底部水的能力。唯一与M. CF相关的植物组织。 Rubrum是Raphidophyceae和Cryptophyceae。虽然M. CF. rubrum反映了与河口中显性的HAB形成浮游植物（Raphidophyte，HeteroSigma Akashiwo）的优势重叠，其降低的竞争能力限制了其丰富。相比之下，M. CF的混纺辅助觅食行为rubrum对加密猎物丰富的自上而下控制，然而，这些猎物资源的可用性有限（平均<300细胞M11）似乎抑制了红积累积的形成。流体动力变异是必要的，以确保没有单一的浮游植物HAB形成分类群耐心耐受。这些结果证实了M. CF的自我生态学的方面。 Rubrum与盐度关联和DVM行为有关，并有助于全球对河口管理疾病的了解。

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  • 来源
    《Harmful Algae》 |2020年第12期|101943.1-101943.9|共9页
  • 作者

    Lemley Daniel A.; Adams Janine B.; Rishworth Gavin M.; Purdie Duncan A.;

  • 作者单位

    Nelson Mandela Univ Dept Bot ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ Inst Coastal & Marine Res CMR DSI NRF Res Chair Shallow Water Ecosyst ZA-6031 Port Elizabeth South Africa;

    Nelson Mandela Univ Dept Bot ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ Inst Coastal & Marine Res CMR DSI NRF Res Chair Shallow Water Ecosyst ZA-6031 Port Elizabeth South Africa;

    Nelson Mandela Univ Inst Coastal & Marine Res CMR DSI NRF Res Chair Shallow Water Ecosyst ZA-6031 Port Elizabeth South Africa|Nelson Mandela Univ Dept Zool ZA-6031 Port Elizabeth South Africa;

    Univ Southampton Natl Oceanog Ctr Southampton Ocean & Earth Sci Southampton SO14 3ZH Hants England;

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  • 正文语种 eng
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  • 关键词

    Cryptophytes; Eutrophication; Heterosigma akashiwo; Phytoplankton; Planktonic ciliates;

    机译：cryptophytes;富营养化;heterosigma akashiwo;浮游植物;浮游纤毛;

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