Present and future potential role of toxin-producing Synechococcus in the tropical region

Sim, Zhi Yang; Goh, Kwan Chien; He, Yiliang; Gin, Karina Yew‐Hoong

doi:10.1016/j.scitotenv.2023.165230

Cited by 4 publications

(3 citation statements)

References 59 publications

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Section: Discussionmentioning

confidence: 58%

“…S6), as observed for picocyanobacteria in other studies (Alegria Zufia et al, 2021; Murrell and Lores, 2004). This group may become more dominant in the Elbe estuary under global warming (see also (Flombaum and Martiny, 2021b)), which might affect food webs due to the relatively low nutritional value and possible toxicity of cyanobacteria (Ger et al, 2016; Sim et al, 2023). Picoeukaryotes were most abundant in spring, but their relative contributions to the phytoplankton communities were overall highest in fall and winter, as well as in the middle reaches of the estuary, i.e.…”

Section: Discussionmentioning

confidence: 99%

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Picophytoplankton dominate phytoplankton communities in the Elbe estuary in terms of cell counts

Martens,

Biederbick,

Schaum

2024

Preprint

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Summary(1)Picophytoplankton are important primary producers, but not always adequately recognized, e.g. due to methodological limitations.(2)In this study, we combined flow cytometry and metabarcoding to investigate seasonal and spatial patterns of picophytoplankton abundance and community composition in the Elbe estuary.(3)Picophytoplankton (mostly picoeukaryotes such asMychonastesandMinidiscus)contributed on average 70 % (SD = 14 %) to the total phytoplankton counts. In the summer picocyanobacteria (e.g.Synechococcus) played a more significant role. The contributions of picophytoplankton to the total phytoplankton were particularly high from summer to winter as well as in the mid estuary. However, at salinities of around 10 PSU in the mixing area the proportion of picophytoplankton was comparably low (average 49 %, SD = 13 %).(4)Our results indicate that picophytoplankton prevail in the Elbe estuary year-round with respect to cell counts. Picophytoplankton could occupy important niche positions to maintain primary production under extreme conditions where larger phytoplankton might struggle (e.g. at high or low temperature and high turbidity), and also benefit from high nutrient availability here. However, we did not find evidence that they played a particularly significant role at the salinity interface. Our study highlights the importance of including picophytoplankton when assessing estuarine phytoplankton as has been suggested for other ecosystems such as oceans.

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Picophytoplankton dominate phytoplankton communities in the Elbe estuary in terms of cell counts

Martens,

Biederbick,

Schaum

2024

Preprint

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“…The correlations between the picocyanobacteria genera and toxins (i.e., Parasynechococcus with MC-LR, and Prochlorococcaceae_XX with nodularin) were unexpectedly high considering the diversity of the known toxigenic taxa ( Supplementary Figure S13 ). While this group are not traditionally considered toxigenic, it has been recently found that picocyanobacteria in tropical freshwaters are capable of cylindrospermopsin production ( Gin et al, 2021 ; Sim et al, 2023 ). Thus, it imperative to further assess the toxigenic potential of these abundant cyanobacteria.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal diversity and community structure of cyanobacteria and associated bacteria in the large shallow subtropical Lake Okeechobee (Florida, United States)

Lefler,

Barbosa,

Zimba

et al. 2023

Front. Microbiol.

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Lake Okeechobee is a large eutrophic, shallow, subtropical lake in south Florida, United States. Due to decades of nutrient loading and phosphorus rich sediments, the lake is eutrophic and frequently experiences cyanobacterial harmful algal blooms (cyanoHABs). In the past, surveys of the phytoplankton community structure in the lake have been conducted by morphological studies, whereas molecular based studies have been seldom employed. With increased frequency of cyanoHABs in Lake Okeechobee (e.g., 2016 and 2018 Microcystis-dominated blooms), it is imperative to determine the diversity of cyanobacterial taxa that exist within the lake and the limnological parameters that drive bloom-forming genera. A spatiotemporal study of the lake was conducted over the course of 1 year to characterize the (cyano)bacterial community structure, using 16S rRNA metabarcoding, with coincident collection of limnological parameters (e.g., nutrients, water temperature, major ions), and cyanotoxins. The objectives of this study were to elucidate spatiotemporal trends of community structure, identify drivers of community structure, and examine cyanobacteria-bacterial relationships within the lake. Results indicated that cyanobacterial communities within the lake were significantly different between the wet and dry season, but not between periods of nitrogen limitation and co-nutrient limitation. Throughout the year, the lake was primarily dominated by the picocyanobacterium Cyanobium. The bloom-forming genera Cuspidothrix, Dolichospermum, Microcystis, and Raphidiopsis were highly abundant throughout the lake and had disparate nutrient requirements and niches within the lake. Anatoxin-a, microcystins, and nodularins were detected throughout the lake across both seasons. There were no correlated (cyano)bacteria shared between the common bloom-forming cyanobacteria Dolichospermum, Microcystis, and Raphidiopsis. This study is the first of its kind to use molecular based methods to assess the cyanobacterial community structure within the lake. These data greatly improve our understanding of the cyanobacterial community structure within the lake and the physiochemical parameters which may drive the bloom-forming taxa within Lake Okeechobee.

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Cyanobacteria-cyanophage interactions between freshwater and marine ecosystems based on large-scale cyanophage genomic analysis

Lin,

Li,

Pan

et al. 2024

Science of The Total Environment

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Present and future potential role of toxin-producing Synechococcus in the tropical region

Cited by 4 publications

References 59 publications

Picophytoplankton dominate phytoplankton communities in the Elbe estuary in terms of cell counts

Picophytoplankton dominate phytoplankton communities in the Elbe estuary in terms of cell counts

Spatiotemporal diversity and community structure of cyanobacteria and associated bacteria in the large shallow subtropical Lake Okeechobee (Florida, United States)

Cyanobacteria-cyanophage interactions between freshwater and marine ecosystems based on large-scale cyanophage genomic analysis

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