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Light fluctuations are key in modulating plankton trophic dynamics and their impact on primary production
Limnology and Oceanography Letters ( IF 7.8 ) Pub Date : 2020-04-28 , DOI: 10.1002/lol2.10156
Françoise Morison 1 , Gayantonia Franzè 1 , Elizabeth Harvey 2 , Susanne Menden‐Deuer 1
Affiliation  

Surface‐ocean mixing creates dynamic light environments with predictable effects on phytoplankton growth but unknown consequences for predation. We investigated how variations in average mixed‐layer (ML) irradiance shaped plankton trophic dynamics by incubating a Northwest‐Atlantic plankton community for 4 days at high (H) and low (L) light, followed by exposure to either sustained or reversed light intensities. In deep‐ML (sustained L), phytoplankton biomass declined (μ = −0.2 ± 0.08 d−1) and grazing was absent. In shallow‐ML (sustained H), growth exceeded grazing (μ = 0.46 ± 0.07 d−1; g = 0.32 ± 0.04 d−1). In rapidly changing ML‐conditions simulated by switching light‐availability, growth and grazing responded on different timescales. During rapid ML‐shoaling (L to H), μ immediately increased (0.23 ± 0.01 d−1) with no change in grazing. During rapid ML‐deepening (H to L), μ immediately decreased (0.02 ± 0.09 d−1), whereas grazing remained high (g = 0.38 ± 0.05 d−1). Predictable rate responses of phytoplankton growth (rapid) vs. grazing (delayed) to measurable light variability can provide insights into predator‐prey processes and their effects on spatio‐temporal dynamics of phytoplankton biomass.

中文翻译:

光的波动是调节浮游生物营养动力学及其对初级生产的影响的关键

海洋混合产生的动态光环境对浮游植物的生长具有可预测的影响,但对捕食的影响未知。我们研究了西北大西洋浮游生物群落在高(H)和低(L)光下孵育4天,然后暴露于持续或反向的光强度下,如何平均混合层(ML)辐照度的变化塑造了浮游生物的营养动力学。 。在深层ML(持续的L)中,浮游植物的生物量下降(μ = -0.2±0.08 d -1),并且没有放牧。在浅层ML(持续的H)中,生长超过放牧(μ = 0.46±0.07 d -1 ; g = 0.32±0.04 d -1)。在通过切换光利用率模拟的快速变化的机器学习条件中,生长和放牧在不同的时间尺度上响应。在快速ML浅洗(从L到H)期间,μ立即增加(0.23±0.01 d -1),而放牧没有变化。在快速ML加深期间(H到L),μ立即下降(0.02±0.09 d -1),而放牧仍然很高(g = 0.38±0.05 d -1)。浮游植物生长(快速)vs。放牧(延迟)对可测量光可变性的可预测速率响应可以提供对捕食者-捕食过程及其对浮游植物生物量时空动态影响的见解。
更新日期:2020-04-28
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