Synechococcus bloom in the Pearl River Estuary and adjacent coastal area–With special focus on flooding during wet seasons

Li, Jiajun; Chen, Zuozhi; Jing, Zhiyou; Zhou, Linbin; Li, Gang; Ke, Zhixin; Jiang, Xin; Liu, Jiaxing; Liu, Huaxue; Tan, Yehui

doi:10.1016/j.scitotenv.2019.07.088

Cited by 37 publications

(31 citation statements)

References 67 publications

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“…Our snook, sampled from Terra Ceia Bay, FL, are likely to encounter and associate with this genus. Also abundant in Wild fish was HIMB11 of the Roseobacter clade (Alphaproteobacteria) which is enriched in waters during blooms of Synechococcus [58], perhaps explaining the cooccurrence of these two groups. Although Synechococcus and Clade Ia (SAR11, Alphaproteobacteria) appear as transient groups that decreased over time in our RAS, HIMB11 remained at low abundances in Captive fish and may represent a core member of the snook microbiota, using a wide variety of compounds for energy [59] to adjust to differing environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

et al. 2021

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Background The environment exerts a strong influence on the fish external microbiota, with lower diversity and increased abundances of opportunistic bacterial groups characterizing cultured fish compared to their wild counterparts. Deviation from a healthy external microbiota structure has been associated with increased susceptibility to bacterial pathogens. Treatment of wild-caught broodstock with copper sulfate for the removal of external parasites is a common aquaculture practice. Despite the microbiota’s importance to fish health, the effects of copper sulfate on mucosal bacterial communities and their ability to recover following this chemical treatment have not been examined. The skin microbiota of adult common snook was characterized from wild individuals (Wild), and wild-caught fish maintained in recirculating aquaculture systems (RAS) immediately following a month-long copper sulfate treatment (Captive-1), and then two-weeks (Captive-2) and 2 years (Captive-3) after cessation of copper treatment. Results The skin microbiota of wild fish were characterized by high diversity and taxa including Synechocococcus, SAR11, and a member of the Roseobacter clade. Bacterial diversity decreased in Captive individuals during the 2-year sampling period. Captive fish harbored greater abundances of Firmicutes, which may reflect glycan differences between aquaculture and natural feeds. Bacterial taxa with copper resistance mechanisms and indicative of metal contamination were enriched in Captive-1 and Captive-2 fish. Vibrionaceae were dominant in Captive fish, particularly immediately and 2 weeks following copper treatment. Based on our observations and previous literature, our results suggest putatively beneficial taxa amass over time in captivity. Within 2 years, Captive individuals harbored Bacillus which contains numerous probiotic candidates and the complex carbon degraders of the family Saprospiraceae. Predicted butanoate metabolism exceeded that of Wild fish, and its reported roles in immunity and energy provision suggest a prebiotic effect for fishes. Conclusions The mucosal microbiota contains bacterial taxa that may act as bioindicators of environmental pollution. Increases in mutualistic groups indicate a return to a beneficial skin microbiota following copper sulfate treatment. Our data also suggests that vastly different taxa, influenced by environmental conditions, can be associated with adult fish without noticeable health impairment, perhaps due to establishment of various mutualists to maintain fish mucosal health.

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Section: Discussionmentioning

confidence: 99%

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

et al. 2021

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“…Because this PC-rich phenotype occurs in more productive waters [ 18 , 34 , 76 ], this observation may be important in the era of climate change and the associated mass occurrence of Synechococcus sp. in many places around the world [ 8 , 9 ]. It should be emphasized that Flombaum et al [ 8 ] predicted that the number of Synechococcus sp.…”

Section: Discussionmentioning

confidence: 99%

“…It is estimated that for about 17% of net primary production in the Global Ocean is responsible solely the genus Synechococcus [ 8 ]. Blooms of these organisms are observed in tropical, subtropical and even temperate zones [ 9 ]. The present global warming causes temperature rise which was recognized as a main cause of the massive shift of species northwards [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Photosynthetic Pigments Changes of Three Phenotypes of Picocyanobacteria Synechococcus sp. under Different Light and Temperature Conditions

Śliwińska‐Wilczewska

Konarzewska

Wiśniewska

et al. 2020

Cells

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It is estimated that the genus Synechococcus is responsible for about 17% of net primary production in the Global Ocean. Blooms of these organisms are observed in tropical, subtropical and even temperate zones, and they have been recorded recently even beyond the polar circle. The long-term scenarios forecast a growing expansion of Synechococcus sp. and its area of dominance. This is, among others, due to their high physiological plasticity in relation to changing environmental conditions. Three phenotypes of the genus Synechococcus sp. (Type 1, Type 2, and Type 3a) were tested in controlled laboratory conditions in order to identify their response to various irradiance (10, 55, 100 and 145 µmol photons m−2 s−1) and temperature (15, 22.5 and 30 °C) conditions. The highest total pigment content per cell was recorded at 10 μmol photons m−2 s−1 at all temperature variants with the clear dominance of phycobilins among all the pigments. In almost every variant the highest growth rate was recorded for the Type 1. The lowest growth rates were observed, in general, for the Type 3a. However, it was recognized to be less temperature sensitive in comparison to the other two types and rather light-driven with the highest plasticity and adaptation potential. The highest amounts of carotenoids were produced by Type 2 which also showed signs of the cell stress even around 55 μmol photons m−2 s−1 at 15 °C and 22.5 °C. This may imply that the Type 2 is the most susceptible to higher irradiances. Picocyanobacteria Synechococcus sp. require less light intensity to achieve the maximum rate of photosynthesis than larger algae. They also tolerate a wide range of temperatures which combined together make them gain a powerful competitive advantage. Our results will provide key information for the ecohydrodynamical model development. Thus, this work would be an important link in forecasting future changes in the occurrence of these organisms in the context of global warming.

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“…Picocyanobacteria are important components and primary producers in aquatic ecosystems [33][34][35]. In the past, picocyanobacteria were described as a non-blooming group [36]; however, some studies demonstrated the potentially dangerous character of picocyanobacterial blooms [37][38][39][40]. Those bloom have caused profound transformations in the aquatic ecosystem and resulted in the loss of fish and clam resources.…”

Section: Introductionmentioning

confidence: 99%

The Importance of Allelopathic Picocyanobacterium Synechococcus sp. on the Abundance, Biomass Formation, and Structure of Phytoplankton Assemblages in Three Freshwater Lakes

Bubak

Śliwińska‐Wilczewska

Głowacka

et al. 2020

Toxins

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The contribution of picocyanobacteria to summer phytoplankton blooms, accompanied by an ecological crisis, is a new phenomenon in Europe. This issue requires careful investigation. We studied allelopathic activity of freshwater picocyanobacterium Synechococcus sp. on phytoplankton assemblages from three freshwater lakes. In this study, the allelopathic activity of the Synechococcus sp. on the total abundance, biomass, as well as structure of the phytoplankton assemblages were investigated. Our results indicated that addition of exudates obtained from Synechococcus sp. affected the number of cells and biomass of the phytoplankton communities; the degree of inhibition or stimulation was different for each species, causing a change in the phytoplankton abundance and dominance during the experiment. We observed that some group of organisms (especially cyanobacteria from the genus Aphanothece, Limnothrix, Microcystis, and Synechococcus) showed tolerance for allelopathic compounds produced and released by Synechococcus sp. It is also worth noting that in some samples, Bacillariophyceae (e.g., Amphora pediculus, Navicula pygmaea, and Nitzschia paleacea) were completely eliminated in the experimental treatments, while present in the controls. This work demonstrated that the allelopathic activity exhibited by the Synechococcus sp. is probably one of the major competitive strategies affecting some of the coexisting phytoplankton species in freshwater ecosystems. To our best knowledge this is the first report of the allelopathic activity of Synechococcus sp. in the freshwater reservoirs, and one of the few published works showing allelopathic properties of freshwater picocyanobacteria on coexisting phytoplankton species.

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Synechococcus bloom in the Pearl River Estuary and adjacent coastal area–With special focus on flooding during wet seasons

Cited by 37 publications

References 67 publications

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

Effect of copper sulfate on the external microbiota of adult common snook (Centropomus undecimalis)

Photosynthetic Pigments Changes of Three Phenotypes of Picocyanobacteria Synechococcus sp. under Different Light and Temperature Conditions

The Importance of Allelopathic Picocyanobacterium Synechococcus sp. on the Abundance, Biomass Formation, and Structure of Phytoplankton Assemblages in Three Freshwater Lakes

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