Interactive effects of warming and eutrophication on zooplankton could reverse the stoichiometric mismatch with phytoplankton

Zhu, Konghao; Zhang, Huan; Zhang, Peiyu; Wang, Panpan; Li, Hailu; Feng, Mingjun; Wang, Huan; Wang, Hongxia; Zhang, Min; Xu, Jun

doi:10.1016/j.watbs.2023.100205

Cited by 2 publications

(1 citation statement)

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“…Microcystis spp., which can form colonies ranging in size from a few microns to a few millimeters, are the most common and ubiquitous toxic blooms ( Paerl et al., 2014 ). Under warming and eutrophic conditions, Microcystis cells have the propensity to aggregate and float upward, giving rise to harmful Microcystis blooms ( Luerling et al., 2017 ; Zhu et al., 2023 ). The extensive proliferation of harmful Microcystis has various negative effects on human health and environmental safety ( Fiehn et al., 1998 ; Susanna et al., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Rapid flotation of Microcystis wesenbergii mediated by high light exposure: implications for surface scum formation and cyanobacterial species succession

Yang,

Pan,

et al. 2024

Front. Plant Sci.

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Increasing occurrences of Microcystis surface scum have been observed in the context of global climate change and the increase in anthropogenic pollution, causing deteriorating water quality in aquatic ecosystems. Previous studies on scum formation mainly focus on the buoyancy-driven floating process of larger Microcystis colonies, neglecting other potential mechanisms. To study the non-buoyancy-driven rapid flotation of Microcystis, we here investigate the floating processes of two strains of single-cell species (Microcystis aeruginosa and Microcystis wesenbergii), which are typically buoyant, under light conditions (150 μmol photons s−1 m−2). Our results showed that M. wesenbergii exhibited fast upward migration and formed surface scum within 4 hours, while M. aeruginosa did not form visible scum throughout the experiments. To further explore the underlying mechanism of these processes, we compared the dissolved oxygen (DO), extracellular polymeric substance (EPS) content, and colony size of Microcystis in different treatments. We found supersaturated DO and the formation of micro-bubbles (50–200 µm in diameter) in M. wesenbergii treatments. M. aeruginosa produces bubbles in small quantities and small sizes. Additionally, M. wesenbergii produced more EPS and tended to aggregate into larger colonies. M. wesenbergii had much more derived-soluble extracellular proteins and polysaccharides compared to M. aeruginosa. At the same time, M. wesenbergii contains abundant functional groups, which was beneficial to the formation of agglomerates. The surface scum observed in M. wesenbergii is likely due to micro-bubbles attaching to the surface of cell aggregates or becoming trapped within the colony. Our study reveals a species-specific mechanism for the rapid floatation of Microcystis, providing novel insights into surface scum formation as well as succession of cyanobacterial species.

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