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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Are microcosm volume and sample pre-filtration relevant to evaluate phytoplankton growth?
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Are microcosm volume and sample pre-filtration relevant to evaluate phytoplankton growth?

机译：缩影量和样品预过滤是否与评估浮游植物的生长有关？

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摘要

"Bottle effects" are one of the most deeply rooted concerns of phytoplankton microcosm studies and are mainly related to incubation time and sample volume. Sample pre-filtration to remove larger grazers is also a common procedure in experimental phytoplankton ecology studies, particularly in nutrient enrichment experiments. However, the effects of bottle volume and sample pre-filtration on the outcomes of such experiments, particularly on the net growth rates of specific phytoplankton taxa, have never been addressed. Therefore, this study aims to evaluate the effects of different bottle volumes and sample pre-filtration on phytoplankton net growth rates in microcosm experiments. To accomplish this goal, unfiltered and filtered (＜ 100 μm) water samples, collected in the Guadiana estuary, were nutrient-enriched to avoid nutrient limitation and incubated for 3 days in polycarbonate microcosms with different volumes (0.5 L-8.0 L), inside a plant growth chamber. Phytoplankton composition, abundance, biomass and taxon-specific net growth rates were evaluated throughout the experiment No systematic significant effects of bottle volume were detected in phytoplankton growth rates. However, sample filtration caused significant changes in phytoplankton composition, with a decline of diatom abundance. Moreover, the removal of large-sized predators and large-sized phytoplankton (diatoms) after sample filtration cascaded down the food web, affecting taxon-specific net growth rates differently. Net growth rates of green algae and eukaryotic picophytoplankton were significantly higher in filtered treatments in respect to unfiltered treatments. Conversely, both diatoms and cryptophytes presented higher net growth rates in unfiltered treatments while net growth rates of picoplanktonic cyanobacteria and plastidic nanoflagellates were not affected by sample filtration. We conclude that, while microcosm volume does not affect results in phytoplankton microcosms, sample pre-filtration may significantly alter the structure of the original phytoplankton community and hence increase the problems associated with the extrapolation of experimental outcomes to the natural environment.
机译：“瓶效应”是浮游植物微观研究中最根深蒂固的问题之一，主要与孵育时间和样本量有关。在浮游植物的生态学研究中，特别是在营养物富集实验中，样品的预过滤以去除较大的放牧者也是常见的程序。但是，从未解决过瓶容量和样品预过滤对此类实验结果的影响，特别是对特定浮游植物类群净生长率的影响。因此，本研究旨在评估微观实验中不同瓶容量和样品预过滤对浮游植物净生长速率的影响。为了实现这一目标，对在瓜迪亚纳河口收集的未经过滤和过滤（＜100μm）的水样进行了营养丰富，以避免营养物质的限制，并在不同体积（0.5 L-8.0 L）的聚碳酸酯缩微膜中孵育了3天。植物生长室。在整个实验过程中评估了浮游植物的组成，丰度，生物量和特定分类群的净生长速率。在浮游植物生长速率中未检测到瓶体积的系统性显着影响。然而，样品过滤导致浮游植物组成发生重大变化，硅藻丰度下降。此外，样品过滤后去除大型捕食者和大型浮游植物（硅藻）会沿着食物网扩散，对分类群特定的净增长率产生不同的影响。与未过滤处理相比，过滤处理中的绿藻和真核微微浮游生物的净增长率显着更高。相反，在未经过滤的处理中，硅藻和隐藻植物的净生长速率较高，而浮游蓝藻和质体鞭毛藻的净生长速率不受样品过滤的影响。我们得出的结论是，虽然微观世界的体积不会影响浮游植物微观世界的结果，但样品的预过滤可能会显着改变原始浮游植物群落的结构，从而增加与将实验结果外推到自然环境有关的问题。

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    Patricia Nogueira; Rita B. Domingues; Ana B. Barbosa;

  • 作者单位

    Centro de Investigacao Marinha e Ambiental, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;

    Centro de Investigacao Marinha e Ambiental, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal,Centro de Oceanografia, Faculdade de Ciencias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal,FCT, ed. 7, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;

    Centro de Investigacao Marinha e Ambiental, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Bottle effects; Bottle volume; Microcosms; Phytoplankton; Pre-filtration; Trophic cascade;

    机译：瓶装效果;瓶容量;缩影;浮游植物;预过滤;营养级联;

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