Effects of terrestrial dissolved organic matter on a bloom of the toxic cyanobacteria, Raphidiopsis raciborskii

Burford, Michele A.; Franklin, Hannah M.; Faggotter, Stephen John; Chuang, Ann; Hayton, Joshua B.; Carroll, Anthony R.

doi:10.1016/j.hal.2022.102269

Cited by 12 publications

(3 citation statements)

References 51 publications

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“…8 ms cm −1 ) Lake Hugh Muntz (28°2 0 60 00 S, 153°24 0 54 00 E). The R. raciborskii and C. ovalisporum blooms occur regularly in lakes Wivenhoe and Hugh Muntz, respectively, with DIP concentrations of both lakes close to or below analytical detection limits (0.06 µmol P l −1 ) during summer stratification [9,19].…”

Section: (A) Experimental Set-up (I) Study Species and Strainsmentioning

confidence: 98%

Phosphorus storage and utilization strategies of two bloom-forming freshwater cyanobacteria

et al. 2023

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The inter-relationships between cellular phosphorus (P) storage, dissolved inorganic P (DIP) uptake affinity, alkaline phosphatase activity (APA) and dissolved inorganic nitrogen (DIN) concentrations were studied in two ubiquitous diazotrophic freshwater cyanobacteria, Raphidiopsis raciborskii (six strains) and Chrysosporum ovalisporum (two strains). DIP uptake kinetics were measured using rates of incorporation of the radio-isotope, 33 P and APA as a proxy for DOP-ester utilization. The study showed that DIP uptake of individual strains followed Michaelis–Menten kinetics (modified in our study to incorporate cellular P quotas), but differed with DIN and P availability, and between growth stages. High-affinity DIP uptake and APA were activated below a P quota threshold of approximately 0.01 µg P µg −1 C across the species and strains. C. ovalisporum had significantly higher APA and P quotas (per unit C and cell) but lower uptake affinity than R. raciborskii . Demand for DIP by C. ovalisporum increased when N fixation occurred, but typically not for R. raciborskii . Our results indicate that cyanobacterial species and strains differ in their strategies to P limiting conditions, and highlight the interplay between N and P. Physiological adaptations like APA and diazotrophy of cyanobacteria adapting to low DIP and/or DIN conditions may occur simultaneously and drive species dominance in oligotrophic environments.

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Section: (A) Experimental Set-up (I) Study Species and Strainsmentioning

confidence: 98%

Phosphorus storage and utilization strategies of two bloom-forming freshwater cyanobacteria

et al. 2023

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“…27 Notably, terrigenous DOM even directly affects the growth of phytoplankton in water. 28 Owing to the dependence of bacteria on C and energy, changes in aquatic species may also regulate the C-based bacterial growth efficiencies, altering the nutrient regeneration and microbial loop structures. 29−32 In addition, DOM provides additional nutrient elements for the growth of phytoplankton, thereby indirectly affecting the growth of their predators: zooplankton.…”

Section: Introductionmentioning

confidence: 99%

“…In Patagonia, discriminate bacterial communities were observed under the influence of nearby forests . Notably, terrigenous DOM even directly affects the growth of phytoplankton in water . Owing to the dependence of bacteria on C and energy, changes in aquatic species may also regulate the C-based bacterial growth efficiencies, altering the nutrient regeneration and microbial loop structures. − In addition, DOM provides additional nutrient elements for the growth of phytoplankton, thereby indirectly affecting the growth of their predators: zooplankton. , In short, DOM enrichment has a considerable stimulating effect on phytoplankton but a weaker effect on zooplankton .…”

Section: Introductionmentioning

confidence: 99%

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Wan

Cao

Song

et al. 2022

Environ. Sci. Technol.

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To explore the effect of different types of dissolved organic matter (DOM) decomposition on nutrient cycling pathways and the microbial loop, four lakes with different DOM sources were investigated monthly. In Lake Tangxun, Dolichospermum decay released highly labile dissolved organic nitrogen into the water column. This induced bacterial organic nitrogen decomposition, as indicated by the increased abundance of gltB, gltD, gdh, and glnA as well as aminopeptidase activity. Genes associated with dissimilatory nitrate reduction to ammonium further fueled ammonium accumulation, driving Microcystis blooms in the summer. In Lake Zhiyin, fish bait deposits (high nitrogen, similar to Dolichospermum detritus) also caused Microcystis blooms. Detritus from Microcystis decomposition then produced high levels of labile dissolved organic phosphorus, inducing phosphatase activity and increasing soluble reactive phosphorus concentrations from September to April in Lakes Tangxun and Zhiyin. The high refractory DOM from macrophytes in Lake Houguan led to insufficient nutrient availability, leading to nutrient mutualism between algae and bacteria. The high levels of labile dissolved organic carbon from terrestrial detritus in Lake Yandong increased bacterial biomass and production, resulting in low chlorophyll content due to the competitive relationship between algal and bacterial nutrient requirements. Therefore, different DOM compositions induce unique connections among available nutrients, algae, and bacteria in the microbial loop.

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Chitosan-modified cotton fiber: An efficient and reusable adsorbent in removal of harmful cyanobacteria, Microcystis aeruginosa from aqueous phases

Park,

Kim,

Choi

et al. 2024

Chemosphere

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Effects of terrestrial dissolved organic matter on a bloom of the toxic cyanobacteria, Raphidiopsis raciborskii

Cited by 12 publications

References 51 publications

Phosphorus storage and utilization strategies of two bloom-forming freshwater cyanobacteria

Phosphorus storage and utilization strategies of two bloom-forming freshwater cyanobacteria

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Chitosan-modified cotton fiber: An efficient and reusable adsorbent in removal of harmful cyanobacteria, Microcystis aeruginosa from aqueous phases

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