Taking advantage of rotifer sensitivity to rotenone to prevent pond crashes for algal-biofuel production

Ginkel, Steven W. Van; Igou, Thomas; Hu, Zixuan; Narode, Asmita; Cheruvu, Sarasija; Doi, Shusuke; Johnston, Rachel K.; Snell, Terry W.; Chen, Yongsheng

doi:10.1016/j.algal.2015.03.013

Cited by 36 publications

(20 citation statements)

References 15 publications

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“…Additionally, the half-life of rotenone in aquatic environments ranges from hours to weeks 48 and depends on several factors, namely temperature and pH, increases in which quicken degradation 28 . Hence, this information, together with the data gathered in this study for protists, and previous studies on zooplankton 49,50 and rotifers 29,30 suggest that the indiscriminate use of this compound in the past may have had disastrous consequences for aquatic food webs, whose extent is largely unknown. (2020) 10:3899 | https://doi.org/10.1038/s41598-020-60764-2 www.nature.com/scientificreports www.nature.com/scientificreports/ Despite the inability of acting as a deterrent of heterotrophic grazing, rotenone can still be used as a good algal crop protector, especially if the predator is a sensitive organism like a ciliate (present study) or a rotifer 29,30 .…”

Section: Discussionmentioning

confidence: 53%

“…Hence, this information, together with the data gathered in this study for protists, and previous studies on zooplankton 49,50 and rotifers 29,30 suggest that the indiscriminate use of this compound in the past may have had disastrous consequences for aquatic food webs, whose extent is largely unknown. (2020) 10:3899 | https://doi.org/10.1038/s41598-020-60764-2 www.nature.com/scientificreports www.nature.com/scientificreports/ Despite the inability of acting as a deterrent of heterotrophic grazing, rotenone can still be used as a good algal crop protector, especially if the predator is a sensitive organism like a ciliate (present study) or a rotifer 29,30 . Nevertheless, future measures should always assess the effect of rotenone on the specific organism that is plaguing the algal culture, as differences in the sensitivity towards the compound are expected, as seen in the present study.…”

Section: Discussionmentioning

confidence: 53%

“…As expected, autotrophs were more resistant to rotenone, with the exception of T. chuii. Other species of the genus Tetraselmis are also reported to be more vulnerable to rotenone than other algae species, such as the marine Nannochloropsis oculata 29 and the freshwater Chlorella kessleri 30 . This observation suggests that there may be a factor that is common to the genus Tetraselmis that enhances cellular susceptibility to this compound, although it is currently unknown.…”

Section: Discussionmentioning

confidence: 99%

“…Rotenone has already been suggested to eliminate unwanted predation by rotifers in microalgae cultures, as microalgae are seemingly unaffected [28][29][30] . Nevertheless, direct evidence of the effects of rotenone on chloroplast-bearing organisms is scarce despite the common assumption that these organisms are largely unaffected.…”

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confidence: 99%

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Caveats on the use of rotenone to estimate mixotrophic grazing in the oceans

Ferreira

Calbet

2020

Sci Rep

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phagotrophic mixotrophs (mixoplankton) are now widely recognised as important members of food webs, but their role in the functioning of food webs is not yet fully understood. This is due to the lack of a well-established technique to estimate mixotrophic grazing. An immediate step in this direction would be the development of a method that separates mixotrophic from heterotrophic grazing that can be routinely incorporated into the common techniques used to measure microplankton herbivory (e.g., the dilution technique). This idea was explored by the addition of rotenone, an inhibitor of the respiratory electron chain that has been widely used to selectively eliminate metazoans, both in the field and in the laboratory. Accordingly, rotenone was added to auto-, mixo-, and heterotrophic protist cultures in increasing concentrations (ca. 24 h). The results showed that mixotrophs survived better than heterotrophs at low concentrations of rotenone. Nevertheless, their predation was more affected, rendering rotenone unusable as a heterotrophic grazing deterrent. Additionally, it was found that rotenone had a differential effect depending on the growth phase of an autotrophic culture. Altogether, these results suggest that previous uses of rotenone in the field may have disrupted the planktonic food web.

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Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Caveats on the use of rotenone to estimate mixotrophic grazing in the oceans

Ferreira

Calbet

2020

Sci Rep

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“…Therefore, grazing by these zooplankton predators must be controlled and prevented. Recently, several studies have been published on the control of zooplankton grazers in algal cultures by different chemical compounds [14][15][16][17][18], but few reports have focused on early detection of grazers to prevent their adverse effects on algal cultures [19].…”

Section: Introductionmentioning

confidence: 99%

Early detection and quantification of zooplankton grazers in algal cultures by FlowCAM

et al. 2017

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Algal cultivation and biomass production for biofuel and other products have many advantages over terrestrial crops. However, sustainable algal cultivation, especially in open ponds, is difficult due to opportunistic zooplankton grazers. There is an urgent need for the development of methods and procedures for early detection and quantification of zooplankton in algal cultures. In this study, the FlowCAM was able to detect and quantify Brachionus calyciflorus, a model organism, in algal cultures with a detection limit of < 1 individual/mL for B. calyciflorus in an algal (Chlorella sp.) cell density of 10 7 cells/mL. The methodology also allowed successful monitoring of rotifer population growth at low density (<1 individual/mL of B. calyciflorus) in dense algal cultures. Furthermore, the methodology was also effective in detecting and quantifying other zooplankton grazers including ciliates, Poterioochromonas sp., and Euplotes sp. in outdoor open raceway cultures.

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Ecosystem responses to the eradication of common carp Cyprinus carpio using rotenone from a reservoir in South Africa

Dalu

Bellingan

Gouws³

et al. 2020

Aquatic Conservation

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The control of invasive alien fish populations using piscicides to alleviate impacts on native biota is a controversial conservation strategy because the collateral impacts on non‐target taxa are not well documented. This article documents the responses of water quality, plankton and macroinvertebrate communities to an eradication of the globally invasive common carp Cyprinus carpio Linnaeus 1758, using the piscicide rotenone in a small South African reservoir. Treated and untreated reservoirs were sampled before and at intervals following rotenone treatment. Sampling endpoints included water quality parameters, plankton, macroinvertebrates and fish. These endpoints were selected to gain an understanding of the ecological impacts of the treatment at various biological levels and to document possible recovery following treatment. The study showed that: (i) the common carp were successfully removed; (ii) water clarity improved following the removal of fish; (iii) invertebrate communities, including macroinvertebrates and large zooplankton, recovered within 6 months of treatment; and (iv) that small zooplankton (i.e. Rotifera) dynamics were complex but rotifer abundances had returned to pre‐treatment levels within 6 months of treatment. There was a 56% similarity between the macroinvertebrate assemblages before and 6 months after treatment, showing a substantial turnover in taxa following treatment. The phytoplankton community of the treated reservoir was dominated by blue‐green and green algae prior to the treatment. The blue‐green algal communities were not present 6 months after the treatment, possibly indicating a change in the nutrient status of the reservoir resulting from lower nutrient concentrations in the water column. The phytoplankton community of the reservoir changed from a community typical of eutrophic waters to a community typical of a lower nutrient state. Within each group, there were species changes, but we suggest these are likely to be part of the altered biological interaction dynamics resulting from fish removals, rather than a direct effect of rotenone.

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Taking advantage of rotifer sensitivity to rotenone to prevent pond crashes for algal-biofuel production

Cited by 36 publications

References 15 publications

Caveats on the use of rotenone to estimate mixotrophic grazing in the oceans

Caveats on the use of rotenone to estimate mixotrophic grazing in the oceans

Early detection and quantification of zooplankton grazers in algal cultures by FlowCAM

Ecosystem responses to the eradication of common carp Cyprinus carpio using rotenone from a reservoir in South Africa

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