Variation of Dissolved Oxygen in the Experiments of Occurrence &amp; Disappearance for Microcystis Bloom

Chen, Mingxi

doi:10.1016/j.proenv.2013.04.075

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…In addition, there is a relationship between dissolved oxygen and chlorophyll-containing organisms present in water, as has been noted [100]. In fact, dissolved oxygen is the second most significant variable in Chl-a prediction.…”

Section: Table 10mentioning

confidence: 66%

A hybrid DE optimized wavelet kernel SVR-based technique for algal atypical proliferation forecast in La Barca reservoir: A case study

Nieto

García–Gonzalo

Lasheras

et al. 2020

Journal of Computational and Applied Mathematics

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Section: Table 10mentioning

confidence: 66%

A hybrid DE optimized wavelet kernel SVR-based technique for algal atypical proliferation forecast in La Barca reservoir: A case study

Nieto

García–Gonzalo

Lasheras

et al. 2020

Journal of Computational and Applied Mathematics

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“…The unicellular Microcystis abundance in the tank was less than twice that in the lake, and the volume of the tank was much smaller than that of the lake; thus, the area of material exchange in the tank was limited. The results of the water parameters showed a lower dissolved oxygen concentration, pH, and total dissolved nitrogen in the tank compared to that in the lake, which might have limited Microcystis growth. − …”

Section: Discussionmentioning

confidence: 95%

Mixotrophic Ochromonas Addition Improves the Harmful Microcystis-Dominated Phytoplankton Community in In Situ Microcosms

Zhang

Wang

et al. 2020

Environ. Sci. Technol.

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Driven by global warming and eutrophication, outbreaks of cyanobacterial blooms have severely impacted ecosystem stability and water safety. Of the organisms used to control cyanobacteria, protozoa can highly resist cyanotoxins, efficiently control cyanobacterial populations, and show considerably different feeding strategies from those of metazoans. Thus, protozoa have great potential to control harmful cyanobacteria and improve phytoplankton composition in eutrophic waters. To evaluate the actual effects of protozoa in controlling cyanobacteria and improving the phytoplankton community structure in the field, an in situ microcosm study was performed using a flagellate Ochromonas gloeopara that ingests Microcystis. Results showed that adding Ochromonas reduced the cyanobacterial populations and increased the chlorophyte and diatom proportions. Furthermore, the species richness and diversity of the phytoplankton community were enhanced in microcosms with Ochromonas. Additionally, there was a gradual increase in the chlorophyte population in the unicellular Microcystis control, while Ochromonas addition significantly accelerated the replacement of dominant species. This study was the first to show the practical effects of protozoa on controlling cyanobacteria in the field, highlighting that a reduction in in situ cyanobacteria via protozoa can improve the phytoplankton community structure, dredge the toxic cyanobacteria-dominated microbial food web, and mitigate harmful cyanobacteria risks in fresh waters.

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“…This value is close to the threshold (7mg/l) that has been proposed as normal for a good survival of these species. 42,43 A decrease in the oxygen content of the culture medium below this threshold would result in a decrease in the biomass of the alga produced, as was observed in culture medium A1. Indeed, in this bottle, a decrease in oxygen to 1.7mg/l on day 21 resulted in a significant decrease in algal biomass from 3.1g to 2.5g.…”

Section: Identification Of the Speciesmentioning

confidence: 86%

Implementation of a microalgae and live prey production system (daphnia) to improve African catfish Clarias gariepinus fry growth

Tine¹,

Diallo²,

Ndao³

et al. 2022

JAMB

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Fish farming in Senegal encounters many difficulties, especially during the first life stages, which are more demanding for food and more sensitive to variations in the physicochemical parameters. Most of the species of aquaculture interest have offspring whose size at birth is very small, thus requiring a particular rich food adapted to the size of the mouth (e.g. live preys which are very rich in nutritive reserves). The objective of this study was to set up a production system of live prey, daphnia for the feeding of fish fry. It consisted of culturing microalgae that were used to fed daphnia reared to fed the fry of the African catfish, Clarias gariepinus. The temperature and dissolved oxygen content in the culture and rearing media were monitored throughout the experiment. The results on species identification showed that the cultured microalgae and reared daphnia species are Microcystis sp and Daphnia magna, respectively. Analyses of algal biomass and daphnia abundance show an increase in these parameters with time. Temperature variations do not affect algal biomass, daphnia abundance and fry growth. On the other hand, a decrease in dissolved oxygen content below a certain threshold (6mg/l) leads to a decrease in algal biomass and daphnia abundance. Among the three feeding rates 1.5g, 3g, 4.5g (the equivalent of 0.5L, 1L, and 1.5L of microalgae, respectively) that were used to feed daphnia, the feeding rate of 3g of biomass corresponding to 1L is more adequate as it gave the best production. The comparison of the effects of the types of feed shows that live daphnia give better growths of C. gariepinus fry than the artificial feed, which may be due to their adequate size and nutrient richness. Thus, this study contributes to the establishment of live prey production systems to boost local aquaculture development and demonstrates the importance of daphnia for the feeding of early fish life stages.

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Variation of Dissolved Oxygen in the Experiments of Occurrence & Disappearance for Microcystis Bloom

Cited by 15 publications

References 9 publications

A hybrid DE optimized wavelet kernel SVR-based technique for algal atypical proliferation forecast in La Barca reservoir: A case study

A hybrid DE optimized wavelet kernel SVR-based technique for algal atypical proliferation forecast in La Barca reservoir: A case study

Mixotrophic Ochromonas Addition Improves the Harmful Microcystis-Dominated Phytoplankton Community in In Situ Microcosms

Implementation of a microalgae and live prey production system (daphnia) to improve African catfish Clarias gariepinus fry growth

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