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首页> 外文期刊>Polar biology >Seasonal microbial processes in a high-latitude fjord (Kongsfjorden, Svalbard): I. Heterotrophic bacteria, picoplankton and nanoflagellates
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Seasonal microbial processes in a high-latitude fjord (Kongsfjorden, Svalbard): I. Heterotrophic bacteria, picoplankton and nanoflagellates

机译：高纬度峡湾（Kongsfjorden，斯瓦尔巴特群岛）的季节性微生物过程：I.异养细菌，微浮游生物和纳米鞭毛虫

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摘要

Temporal dynamics of the microbial food web in the Barents Sea and adjacent water masses in the European Arctic are to a large extent unknown. Seasonal variation in stocks and production rates of heterotrophic bacteria and phototrophic and heterotrophic picoplankton and nanoflagellates was investigated in the upper 50 m of the high-latitude Kongsfjorden, Svalbard, during six field campaigns between March and December 2006. Heterotrophic bacteria, picoplankton and nanoflagellates contributed to ecosystem structure and function in all seasons. Activity within the microbial food web peaked during spring bloom in April, parallel to low abundances of mesozooplankton. In the nutrient-limited post-bloom scenario, an efficient microbial loop, fuelled by dissolved organic carbon from abundant mesozooplankton feeding on phytoplankton and protozooplankton, facilitated maximum integrated primary production rates. A tight microbial food web consisting of heterotrophic bacteria and phototrophic and heterotrophic picoplankton and nanoflagellates was found in the stratified water masses encountered in July and September. Microbial stocks and rates were low but persistent under winter conditions. Seasonal comparisons of microbial biomass and production revealed that structure and function of the microbial food web were fundamentally different during the spring bloom when compared with other seasons. While the microbial food web was in a regenerative mode most of the time, during the spring bloom, a microbial transfer mode represented a trophic link for organic carbon in time and space. The microbial food web's ability to fill different functional roles in periods dominated by new and regenerated production may enhance the ecological flexibility of pelagic ecosystems in the present era of climate change.
机译：巴伦支海和欧洲北极地区邻近水团的微生物食物网的时间动态在很大程度上是未知的。在2006年3月至12月的六次野外活动中，在斯瓦尔巴群岛高纬度Kongsfjorden的上部50 m调查了异养细菌，光养和异养微微浮游动物以及纳米鞭毛虫的种群数量和生产率的季节性变化。各个季节的生态系统结构和功能。微生物食物网中的活动在四月的春季开花期间达到高峰，这与中游浮游动物的低丰度平行。在营养有限的花后场景中，有效的微生物循环由浮游植物和原生动物浮游生物的大量中生浮游动物的溶解有机碳驱动，促进了最大的综合初级生产力。在7月和9月遇到的分层水团中发现了紧密的微生物食物网，其中包括异养细菌，光养和异养微微浮游生物以及纳米鞭毛。微生物资源和比率较低，但在冬季条件下持续存在。微生物生物量和生产的季节性比较显示，与其他季节相比，春季开花期间微生物食物网的结构和功能存在根本差异。当微生物食物网大部分时间处于再生模式时，在春季开花期间，微生物转移模式代表了有机碳在时间和空间上的营养联系。在当前的气候变化时代，微生物食物网在新的和再生的生产所主导的时期中扮演不同职能角色的能力可能会增强中上层生态系统的生态灵活性。

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  • 来源
    《Polar biology》 |2011年第5期|p.731-749|共19页
  • 作者

    Kriss Rokkan Iversen; Lena Seuthe;

  • 作者单位

    Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Troms0, Breivika, 9037 Troms0, Norway;

    Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Troms0, Breivika, 9037 Troms0, Norway;

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  • 正文语种 eng
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  • 关键词

    microbial food web; seasonal; arctic; bacteria; picoplankton; nanoflagellates;

    机译：微生物食物网;季节性北极;菌;浮游生物纳米鞭毛;

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