Changes in phytoplankton size–structure alter trophic transfer in a temperate, coastal planktonic food web

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Pierre Marrec, Susanne Menden-Deuer
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Abstract

Microzooplankton grazing is an essential parameter to predict the fate of organic matter production in planktonic food webs. To identify predictors of grazing, we leveraged a 6-yr time series of coastal plankton growth and grazing rates across contrasting environmental conditions. Phytoplankton size–structure and trophic transfer were seasonally consistent with small phytoplankton cell dominance and low trophic transfer in summer, and large cell dominance and higher trophic transfer in winter. Departures from this pattern during two disruptive events revealed a critical link between phytoplankton size–structure and trophic transfer. An unusual summer bloom of large phytoplankton cells yielded high trophic transfer, and an atypical winter dominance of small phytoplankton resulted in seasonally atypical low trophic transfer. Environmental conditions during these events were neither seasonally atypical nor unique. Thus, phytoplankton size–structure rather than environmental conditions held a key-role driving trophic transfer. Phytoplankton size–structure is easily measurable and could impart predictive power of food-web structure and the fate of primary production in coastal ecosystems.

Abstract Image

浮游植物大小结构的变化改变了温带沿海浮游食物网的营养传递
微型浮游动物的捕食是预测浮游食物网中有机物质生产命运的一个重要参数。为了确定放牧的预测因素,我们利用了沿海浮游生物生长和放牧率在不同环境条件下的 6 年时间序列。浮游植物的大小结构和营养传递在季节上是一致的,即夏季小型浮游植物细胞占优势,营养传递低;冬季大型浮游植物细胞占优势,营养传递高。在两次破坏性事件中,这一模式的偏离揭示了浮游植物大小结构与营养传递之间的关键联系。夏季大型浮游植物细胞的异常繁殖产生了高营养传递,而冬季小型浮游植物的非典型优势则导致了季节性非典型低营养传递。这些事件发生时的环境条件既不是季节性的,也不是唯一的。因此,浮游植物的大小结构而不是环境条件是驱动营养物质转移的关键因素。浮游植物的大小结构很容易测量,可以预测沿岸生态系统的食物网结构和初级生产的命运。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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