Combined effects of nitrogen levels and Daphnia culture filtrate on colony size of Scenedesmus obliquus

Zhu, Xiaoyong; Yang, Jin Kuk; Xu, Nuo; Chen, Ge; Yang, Zhou

doi:10.1016/j.algal.2015.03.002

Cited by 15 publications

(6 citation statements)

References 20 publications

(34 reference statements)

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“…Several features of these Secendesmus colonies are relevant to flocculation. First, colonies have higher sinking rates than unicells and, generally, sinking velocities increase with an increased colony size (Zhu et al 2015b ). Second, the magnitude of inducible colony formation can vary with duration of exposure to grazer cues and on grazer density.…”

Section: Introductionmentioning

confidence: 99%

The use of natural infochemicals for sustainable and efficient harvesting of the microalgae Scenedesmus spp. for biotechnology: insights from a meta-analysis

2016

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Open raceway ponds are regarded as the most economically viable option for large-scale cultivation of microalgae for low to mid-value bio-products, such as biodiesel. However, improvements are required including reducing the costs associated with harvesting biomass. There is now a growing interest in exploiting natural ecological processes within biotechnology. We review how chemical cues produced by algal grazers induce colony formation in algal cells, which subsequently leads to their sedimentation. A statistical meta-analysis of more than 80 studies reveals that Daphnia grazers can induce high levels of colony formation and sedimentation in Scenedesmus obliquus and that these natural, infochemical induced sedimentation rates are comparable to using commercial chemical equivalents. These data suggest that natural ecological interactions can be co-opted in biotechnology as part of a promising, low energy and clean harvesting method for use in large raceway systems.

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Section: Introductionmentioning

confidence: 99%

The use of natural infochemicals for sustainable and efficient harvesting of the microalgae Scenedesmus spp. for biotechnology: insights from a meta-analysis

2016

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“…These regression analysis results could be used to predict the sedimentation performance of S. obliquus based on a large number research results about the effects of environmental factors on colony size of S. obliquus. 7,8 These predictions would provide some references to choose proper agent to promote sedimentation of S. obliquus for harvesting.…”

Section: Discussionmentioning

confidence: 92%

“…The ltrates were considered to signicantly increase the colony size of S. obliquus and hence improve the harvesting efficiency. 7 Nevertheless, large Daphnia culture ltrates themselves consume much energy and demand signicant nancial resources. Low light intensity was also reported to induce colony formation of S. obliquus 8 whereas algal biomass growth would also be inhibited due to low light intensity.…”

Section: Introductionmentioning

confidence: 99%

“…9 On the other hand, the authors only investigated colony size of S. obliquus rather than the sedimentation efficiency. 9 Hitherto, there was not a clear nding illustrating the relationship between colony size and sedimentation efficiency of S. obliquus even in the work of Zhu et al, 7 in which combined effects of nitrogen levels and Daphnia culture ltrate on colony size of S. obliquus were well studied. Therefore, it is still important to study the effects of LAS on colony size and sedimentation efficiency of S. obliquus with proper concentration gradient of LAS.…”

Section: Introductionmentioning

confidence: 99%

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Linear alkylbenzene sulfonate (LAS) promotes sedimentation and lipid accumulation in Scenedesmus obliquus

et al. 2017

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“…Previous studies testing for a cost of multicellular group formation have tended to obtain positive results (Lurling and Van Donk 2000;O'donnell et al 2012;Wang et al 2014;Wang et al 2015;Zhu et al 2015;Zhu et al 2016). Potential costs of group forma-tion include resource competition, a cost of producing extracellular adhesive molecules, and higher sinking rates (Reynolds 1984;Lancelot and Mathot 1985;Kirk 1994;Trainor 1998;Ploug et al 1999;Lürling 1999;Tollrian and Dodson 1999).…”

Section: Costs Of Multicellular Group Formationmentioning

confidence: 99%

The costs and benefits of multicellular group formation in algae*

Kapsetaki

West

2019

Evolution

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The first step in the evolution of complex multicellular organisms involves single cells forming a cooperative group. Consequently, to understand multicellularity, we need to understand the costs and benefits associated with multicellular group formation. We found that in the facultatively multicellular algae Chlorella sorokiniana: (1) the presence of the flagellate Ochromonas danica or the crustacean Daphnia magna leads to the formation of multicellular groups; (2) the formation of multicellular groups reduces predation by O. danica, but not by the larger predator D. magna; (3) under conditions of relatively low light intensity, where competition for light is greater, multicellular groups grow slower than single cells; (4) in the absence of live predators, the proportion of cells in multicellular groups decreases at a rate that does not vary with light intensity. These results can explain why, in cases such as this algae species, multicellular group formation is facultative, in response to the presence of predators.

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Combined effects of nitrogen levels and Daphnia culture filtrate on colony size of Scenedesmus obliquus

Cited by 15 publications

References 20 publications

The use of natural infochemicals for sustainable and efficient harvesting of the microalgae Scenedesmus spp. for biotechnology: insights from a meta-analysis

The use of natural infochemicals for sustainable and efficient harvesting of the microalgae Scenedesmus spp. for biotechnology: insights from a meta-analysis

Linear alkylbenzene sulfonate (LAS) promotes sedimentation and lipid accumulation in Scenedesmus obliquus

The costs and benefits of multicellular group formation in algae*

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