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首页> 外文期刊>Estuarine Coastal and Shelf Science >Tracing the isotopic signal of a cyanobacteria bloom through the food web of a Baltic Sea coastal lagoon
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Tracing the isotopic signal of a cyanobacteria bloom through the food web of a Baltic Sea coastal lagoon

机译：通过波罗的海沿海泻湖的食物网追踪蓝藻绽放的同位素信号

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This study shows that cyanobacteria blooms support secondary production in a diverse group of benthic and pelagic consumers and illustrate the utility of stable isotopes for tracking the cyanobacteria signal in aquatic food webs. We characterized seasonal patterns in δ~(13)C and δ~(15)N signatures of particulate organic matter (POM) and consumers in a eutrophic coastal lagoon (Curonian Lagoon, SE Baltic Sea) before, during and after a cyanobacteria bloom. We found that during the pre- and post-bloom periods (spring and autumn), POM from the lagoon was isotopically indistinguishable from riverine POM. During the bloom, the increase in phytoplankton biomass and dominance by N_2-fixing cyanobacteria resulted in higher δ~(13)C and lower δ~(15)N of POM. These changes in POM were reflected in isotopic signatures of primary consumers with greatest response among fast-growing planktonic and nectobenthic crustaceans and chironomids. Results from end-member mixing analyses suggest that cyanobacteria accounted for 50-80% of production by these consumers during the bloom period. Weaker responses were observed among slow-growing species, particularly long-lived bivalves such as Dreissena. Cyanobacteria-induced shifts in δ~(13)C and δ~(15)N could be tracked to secondary consumers, particularly fast-growing forms such as predatory zooplankton (Leptodora) and juvenile fishes (European perch). We suggest that reconstruction of the food web at the upper trophic levels should incorporate isotopic baselines of both fast-and slow-growing primary consumers to reflect the contribution of blooms events.
机译：这项研究表明，蓝藻水华支持不同种类的底栖和中上层消费者的二次生产，并说明了稳定同位素在追踪水生食物网中蓝细菌信号方面的实用性。我们在蓝藻开花前后，富营养化的沿海泻湖（Curonian Lagoon，SE波罗的海）中的颗粒有机质（POM）和消费者的δ〜（13）C和δ〜（15）N签名中描述了季节性模式。我们发现在开花前后，春季和秋季，泻湖中的POM与河流中的POM在同位素上是无法区分的。在开花期间，浮游植物生物量的增加和N_2固定蓝细菌的优势导致POM的δ〜（13）C升高和δ〜（15）N降低。 POM的这些变化反映在主要消费者的同位素特征中，在快速增长的浮游和底栖甲壳类动物和手足动物中反应最大。最终成员混合分析的结果表明，在开花期，蓝细菌占这些消费者产量的50-80％。在生长缓慢的物种中观察到较弱的响应，特别是长寿命的双壳类，如Dreissena。蓝细菌引起的δ〜（13）C和δ〜（15）N的变化可以追踪到二级消费者，特别是快速增长的形式，例如捕食性浮游动物（Leptodora）和幼鱼（欧洲鲈鱼）。我们建议，在较高营养级别的食物网重建应纳入快速增长和缓慢增长的主要消费者的同位素基线，以反映水华事件的贡献。

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