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The effects of salinity and N : P on N-rich toxins by both an N-fixing and non-N-fixing cyanobacteria
Limnology and Oceanography Letters ( IF 7.8 ) Pub Date : 2022-01-20 , DOI: 10.1002/lol2.10234
Felicia S Osburn 1, 2 , Nicole D Wagner 2 , Raegyn B Taylor 3 , C Kevin Chambliss 2, 3, 4 , Bryan W Brooks 2, 4, 5, 6 , J Thad Scott 1, 2, 4
Affiliation  

Freshwater ecosystems are experiencing increased salinization. Adaptive management of harmful algal blooms (HABs) contributes to eutrophication/salinization interactions through the hydrologic transport of blooms to coastal environments. We examined how nutrients and salinity interact to affect growth, elemental composition, and cyanotoxin production/release in two common HAB genera. Microcystis aeruginosa (non-nitrogen [N]-fixer and microcystin-LR producer [MC-LR]) and Aphanizomenon flos-aquae (N-fixer and cylindrospermopsin producer [CYN]) were grown in N : phosphorus (N : P) 4 and 50 (by atom) for 21 and 33 d, respectively, then dosed with a salinity gradient (0–10.5 g L−1). Both total MC-LR and CYN were correlated with particulate N. We found Microcystis MC-LR production and release was affected by salinity only in the N : P 50 treatment. However, Aphanizomenon CYN production and release was affected by salinity regardless of N availability. Our results highlight how cyanotoxin production and release across the freshwater–marine continuum are controlled by ecophysiological differences between N-acquisition traits.

中文翻译:

盐度和 N : P 对固氮和非固氮蓝藻产生的富氮毒素的影响

淡水生态系统正在经历日益严重的盐碱化。有害藻华 (HAB) 的适应性管理通过水华向沿海环境的水文输送,导致富营养化/盐碱化相互作用。我们研究了养分和盐度如何相互作用以影响两个常见 HAB 属的生长、元素组成和藻毒素的产生/释放。铜绿微囊藻(非氮 [N]-固定剂和微囊藻毒素 LR 生产者 [MC-LR])和Aphanizomenon flos-aquae(N-固定剂和圆柱孢子菌素生产者 [CYN])在 N: 磷 (N: P) 4 中生长和 50(按原子计算)分别持续 21 天和 33 天,然后加入盐度梯度 (0–10.5 g L −1 )。总 MC-LR 和 CYN 均与颗粒物 N 相关。我们发现微囊藻MC-LR 的产生和释放仅在 N : P 50 处理中受盐度影响。然而,无论 N 可用性如何,束丝藻CYN 的生产和释放都受到盐度的影响。我们的研究结果强调了蓝藻毒素在淡水-海洋连续体中的产生和释放是如何受 N 获取性状之间的生态生理学差异控制的。
更新日期:2022-01-20
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