Screening of microalgae and LED grow light spectra for effective removal of dissolved nutrients from cold-water recirculating aquaculture system (RAS) wastewater

Stevčić, Čedomir; Pulkkinen, Katja; Pirhonen, Juhani

doi:10.1016/j.algal.2019.101681

Cited by 20 publications

(13 citation statements)

References 48 publications

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“…strain CPCC 336 was obtained from the Canadian Phycological Culture Centre, originally isolated from a clear-water lake, and thus was not readily adapted to brown waters. The algae were maintained phototrophically in the authors' culture collection as stock cultures in MWC (Modified Wright's Cryptophyte) media (Guillard & Lorenzen, 1972) with some modifications (Stevčić et al, 2019; see Methods S1) at 18°C under light-dark cycle of 12:12 h (light intensity of 50-70 μmol quanta m −2 s −1 ).…”

Section: Strains Culture Preparation and Growing Conditionsmentioning

confidence: 99%

Metabolic plasticity of mixotrophic algae is key for their persistence in browning environments

et al. 2022

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Light availability is the main regulator of primary production, shaping photosynthetic communities and their production of ecologically important biomolecules. In freshwater ecosystems, increasing dissolved organic carbon (DOC) concentrations, commonly known as browning, leads to lower light availability and the proliferation of mixotrophic phytoplankton. Here, a mixotrophic algal species (Cryptomonas sp.) was grown under five increasing DOC concentrations to uncover the plastic responses behind the success of mixotrophs in browning environments and their effect in the availability of nutritionally important biomolecules. In addition to the browning treatments, phototrophic, heterotrophic and mixotrophic growth conditions were used as controls. Despite reduced light availability, browning did not impair algal growth compared to phototrophic conditions. Comparative transcriptomics showed that genes related to photosynthesis were down‐regulated, whereas phagotrophy gene categories (phagosome, lysosome and endocytosis) were up‐regulated along the browning gradient. Stable isotope analysis of phospholipid fractions validated these results, highlighting that the studied mixotroph increases its reliance on heterotrophic processes with browning. Metabolic pathway reconstruction using transcriptomic data suggests that organic carbon is acquired through phagotrophy and used to provide energy in conjunction with photosynthesis. Although metabolic responses to browning were observed, essential fatty acid content was similar between treatments while sterol content was slightly higher upon browning. Together, our results provide a mechanistic model of how a mixotrophic alga responds to browning and how such responses affect the availability of nutritionally essential biomolecules for higher trophic levels.

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Section: Strains Culture Preparation and Growing Conditionsmentioning

confidence: 99%

Metabolic plasticity of mixotrophic algae is key for their persistence in browning environments

et al. 2022

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“…Paraphysomonas can be effective in the biologically mediated regeneration and recycling process of Fe, Zn, Th and Mn playing a role in their biogeochemical cycles (Hutchins & Bruland, 1994;Barbeau et al, 2001). Synura petersenii and Mallomonas caudata have high capacity for removal of nitrogen and phosphorus, which can be useful in water treatment management (Stevčić et al, 2019).…”

Section: Water Purificationmentioning

confidence: 99%

Contribution of silica-scaled chrysophytes to ecosystems services: a review

et al. 2022

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Silica-scaled chrysophytes are a unique group of protists representing a major component of numerous aquatic habitats where they can significantly contribute to human well-being in many ways. In the present review, altogether 14 ecosystem services provided by silica-scaled chrysophytes were identified highlighting their importance and roles in aquatic ecosystems. The most important supporting services are related to primary production, nutrient- and biogeochemical cycling, as well as sediment formation. Additionally, they are involved in the regulation of climate, maintenance of air quality, biological control and water purification processes (as regulating services). The most relevant provisioning services include their usefulness in environmental monitoring (paleolimnology, ecological status assessment and climate modelling), production of biochemicals and provision of genetic resources. Cultural services are associated with aesthetic values, inspiration source and knowledge system as well. Although silica-scaled chrysophytes are one of the least studied groups of algae, here they are shown to provide important benefits and to have many further powerful opportunities for humans, thus their detailed research in the future is emphasised as an important key for human well-being.

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“…Bioremediation of aquaculture WW by microalgae is mostly limited to warmer geographical locations (e.g. Egloff et al, 2018), but their efficiency in cold and temperate climates (below 20°C) has also been demonstrated (Stevčić et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…However, Daphnia do not suit for all WWs due to their sensitivity to high levels of dissolved nutrients (>35, >6, >250, and >50 mg L -1 of NH4 + , NO2 -, NO3 -, and PO4 3-, respectively) (Maceda-Veiga et al, 2015;Serra et al, 2019a). In RAS WW the levels of these nutrients are typically much lower (<0.4, <0.3, <133, and <6 mg L -1 of NH4 + , NO2 -, NO3 -, and PO4 3-, respectively) (Piedrahita, 2003;Bregnballe, 2015;Stevčić et al, 2019), and the levels are further reduced after bioremediation with microalgae (Stevčić et al, 2019). Although the filtration efficiency of D. magna is influenced negatively by temperatures below 20°C (McMahon and Rigler, 1965), the larger body size and higher longevity of Daphnia in temperatures below 20°C induce higher overall ingestion rates (Sodré and Bozelli, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we aimed to find a suitable microalgae species for an efficient microalgae-Daphnia bioremediation system of unfiltered RAS wastewater (WW) specifically in Nordic RAS conditions (~17°C). We evaluated the growth and filtration efficiency of waterflea (Daphnia magna) when fed with green microalgae species that we have previously found to be efficient for nutrient removal in Nordic RAS WW (Stevčić et al, 2019). The nutrient removal by microalgae-Daphnia bioremediation system is likely to depend not only on the species of microalgae but also on the density of Daphnia, as the crowding of Daphnia affects negatively their growth and efficiency in microalgal removal from a suspension (McMahon and Rigler, 1965;Matveev, 1993;Marzetz et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Efficiency of Daphnia magna in removal of green microalgae cultivated in Nordic recirculating aquaculture system wastewater

2020

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Screening of microalgae and LED grow light spectra for effective removal of dissolved nutrients from cold-water recirculating aquaculture system (RAS) wastewater

Cited by 20 publications

References 48 publications

Metabolic plasticity of mixotrophic algae is key for their persistence in browning environments

Metabolic plasticity of mixotrophic algae is key for their persistence in browning environments

Contribution of silica-scaled chrysophytes to ecosystems services: a review

Efficiency of Daphnia magna in removal of green microalgae cultivated in Nordic recirculating aquaculture system wastewater

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