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Cyanobacteria as a Food Source for Invertebrates: Results of a Model Experiment
Russian Journal of Ecology ( IF 1.1 ) Pub Date : 2021-06-11 , DOI: 10.1134/s1067413621030036
N. A. Berezina , A. V. Tiunov , S. M. Tsurikov , S. A. Kurbatova , L. G. Korneva , O. S. Makarova , S. N. Bykova

Abstract

Cyanobacterial blooms are regarded as a global environmental problem. The role of cyanobacteria in the food web of water bodies is still unclear. We have carried out an experimental study of invertebrate trophic relationships during the bloom of the cyanobacterium Aphanizomenon flos-aquae. The key links of the food web—plankton, microperiphyton, detritus, and benthic invertebrates—were collected for stable isotope analysis of carbon (δ13C) and nitrogen (δ15N) after 20-day exposure in mesocosms simulating the conditions of the near-shore biotope of the Rybinsk Reservoir without cyanobacteria (variant I) and with high abundance of cyanobacteria (variant II). Statistically significant differences in the δ15N values for crustaceans (Cladocera, Copepoda, Asellus aquaticus and Gmelinoides fasciatus), and mayfly larvae have been revealed between the variants: these values were 1–4‰ lower in the variant with cyanobacteria than in the variant without them. The cyanobacteria-induced shifts in the δ15N value for consumers indicate an assimilation of diazotrophic nitrogen and incorporation of cyanobacterial nutrients into their food chains.



中文翻译:

蓝藻作为无脊椎动物的食物来源:模型实验结果

摘要

蓝藻水华被认为是一个全球性的环境问题。蓝藻在水体食物网中的作用尚不清楚。我们对蓝藻Aphanizomenon flos-aquae开花期间无脊椎动物的营养关系进行了实验研究。收集食物网的关键环节——浮游生物、微附生生物、碎屑和底栖无脊椎动物——在模拟地球环境条件的中层环境中暴露 20 天后,对碳 (δ 13 C) 和氮 (δ 15 N)进行稳定同位素分析。雷宾斯克水库的近岸生物群落,没有蓝藻(变体 I)和高丰度的蓝藻(变体 II)。δ 15 的统计显着差异甲壳类动物(枝角纲、桡足类、Asellus AquaticusGmelinoides fasciatus)和蜉蝣幼虫的N 值已在变体之间显示:这些值在有蓝藻的变体中比在没有蓝藻的变体中低 1–4‰。蓝藻引起的消费者δ 15 N 值的变化表明固氮氮的同化和蓝藻营养物质进入他们的食物链。

更新日期:2021-06-13
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