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首页> 外文期刊>Aquatic Sciences >Community structure in boreal lakes with recurring blooms of the nuisance flagellate Gonyostomum semen
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Community structure in boreal lakes with recurring blooms of the nuisance flagellate Gonyostomum semen

机译：北方湖泊中滋生鞭毛的Gonyostomum精液反复开花的群落结构

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摘要

Blooms of the nontoxic raphidophyte Gonyostomum semen have shown a recent increase in frequency and distribution in the Fennoscandian region. Due to large cell size and several grazer-avoidance strategies, G. semen is hypothesized to be inedible for most zooplankton species and therefore may constitute a bottleneck for the transfer of energy and nutrients in pelagic food webs. Repression of other phytoplankton through increased competition and induced mortality could further exacerbate this effect. In a field study of four lakes with recurring blooms of G. semen and four lakes without blooms, we found significant differences in community structure between the two lake groups during the bloom period. Bloom-lakes had lower biovolumes of small chrysophytes and chlorophytes and zooplankton assemblages were predominated by small, potentially bacterivorous cladocerans, suggesting a limited availability of edible phytoplankton and an increased importance of microbial pathways during G. semen blooms. Low biovolumes of large cladocerans in bloom-lakes may be due to interference of G. semen with filter feeding. Moreover, high abundances of the phantom midge Chaoborus flavicans in bloom-lakes suggest that the flow of energy and nutrients is directed more towards this invertebrate predator than fish. This could have negative impacts on fish populations, especially if bloom periods are prolonged.
机译：芬诺斯堪的亚地区无毒的斜生植物灵芝精液的开花显示出频率和分布的近期增加。由于较大的细胞大小和几种避免吃草的策略，据推测精液对大多数浮游动物都是不可食用的，因此可能构成中上层食物网中能量和营养转移的瓶颈。通过增加竞争和抑制死亡率来抑制其他浮游植物可能会进一步加剧这种影响。在对四个反复出现G.精液开花的湖泊和四个没有开花的湖泊进行的田间研究中，我们发现在开花期两个湖泊群之间的群落结构存在显着差异。水华湖的小型金藻和绿藻植物的生物量较低，浮游动物的组合以小型的，潜在的细菌性锁骨藻为主，这表明食用浮游植物的可利用性有限，而精液中的微生物途径的重要性日益增加。盛放湖中大型锁骨的生物量较低，可能是由于精液对滤料的干扰。此外，在盛开的湖水中，幻影mid虫黄蜂的数量很多，这表明能量和营养物质的流动比鱼类更倾向于这种无脊椎动物。这可能对鱼类种群产生负面影响，特别是如果开花期延长。

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  • 来源
    《Aquatic Sciences》 |2013年第3期|447-455|共9页
  • 作者

    Karin S. L. Johansson; Cristina Trigal; Tobias Vrede; Richard K. Johnson;

  • 作者单位

    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, 750 07 Uppsala, Sweden;

    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, 750 07 Uppsala, Sweden,Swedish Species Information Center,Swedish University of Agricultural Sciences,Uppsala, Sweden;

    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, 750 07 Uppsala, Sweden;

    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, 750 07 Uppsala, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Algal blooms; Phytoplankton; Zooplankton; Benthic Invertebrates; Raphidophyceae;

    机译：藻华;浮游植物;浮游动物;底栖无脊椎动物;蓝藻科;

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