Potential grazing impact of the mixotrophic flagellate Ochromonas sp. (Chrysophyceae) on bacteria in an extremely acidic lake

Schmidtke, Andrea; Bell, Elanor M.; Weithoff, Guntram

doi:10.1093/plankt/fbl034

Cited by 41 publications

(40 citation statements)

References 38 publications

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“…In the epilimnion, the heterotrophic carbon gain of Ochromonas sp. is three times higher than autotrophic production (Schmidtke et al 2006). According to light-microscopic analysis the strain was identified as a member of the genus Ochromonas (Nixdorf et al 1998); however, it was not possible to assign a species name.…”

Section: Methodsmentioning

confidence: 99%

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A biochemical explanation for the success of mixotrophy in the flagellate Ochromonas sp.

Boëchat

Weithoff

Krüger

et al. 2007

Limnology & Oceanography

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We report the influence of different nutritional modes-autotrophy, mixotrophy, and heterotrophy-on the fatty acid and sterol composition of the freshwater flagellate Ochromonas sp. and discuss the ecological significance of our results with respect to the resource competition theory (rct). Polyunsaturated fatty acids (PUFAs) are the most efficient biochemical variable distinguishing between nutritional modes of Ochromonas sp. Decreasing concentrations of PUFAs were observed in the order autotrophs, mixotrophs, heterotrophs. In mixotrophs and heterotrophs, concentrations of saturated fatty acids were higher than those of monounsaturated fatty acids and PUFAs as a result of bacterivory. Stigmasterol was the main sterol in Ochromonas sp., regardless of nutritional mode. Mixotrophs showed higher growth rates than heterotrophs, which could not be explained by rct. Heterotrophs, in turn, exhibited higher growth rates than autotrophs, which were cultured under the same light conditions as mixotrophs. Mixotrophs can synthesize PUFAs, which are important for many physiological functions such as membrane permeability and growth. Thus, mixotrophy facilitated efficient growth as well as the ability to synthesize complex and essential biomolecules. These strong synergetic effects are due to the combination of biochemical benefits of heterotrophic and autotrophic metabolic pathways and cannot be predicted by rct.

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Section: Methodsmentioning

confidence: 99%

“…for our strain until the taxonomy of the genus Ochromonas is revised. It is, however, the same strain used in previous studies (Tittel et al 2003;Schmidtke et al 2006).…”

Section: Methodsmentioning

confidence: 99%

A biochemical explanation for the success of mixotrophy in the flagellate Ochromonas sp.

Boëchat

Weithoff

Krüger

et al. 2007

Limnology & Oceanography

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“…In fact, inactive grazers are a common phenomenon in feeding experiments (e.g. Schmidtke et al 2006), leading to underestimations of mixotroph abundance and overestimations of phototrophic forms. Furthermore, the mixotrophs were identified based on their FLB uptake, and many studies in the literature report discrimination against FLB compared to living bacteria (e.g.…”

Section: Relative Importance Of Different Nanoflagellate Forms Under mentioning

confidence: 99%

Relative importance of phototrophic, heterotrophic, and mixotrophic nanoflagellates in the microbial food web of a river-influenced coastal upwelling area

Vargas

Contreras²,

Iriarte³

2012

Aquat. Microb. Ecol.

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. However, since HNF dominated in terms of abundance, they were the dominant grazers on bacterioplankton populations. Estimates of grazing pressure for the microbial food web showed that MNF were capable of removing 1 to 51% BP d . Given the area's relatively high nutrient condition, the elevated MNF biomass in the river plume and the greater bacterivory impact from MNF in winter, it seems that light and, thus, the energy/carbon limitation could be the main trigger for mixotrophy in this river-influenced coastal upwelling area. KEY WORDS: Mixotrophy · River discharge · Upwelling area · Plankton food webResale or republication not permitted without written consent of the publisher

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“…However, there are relatively few investigations carried out on natural communities that comparatively analyze in situ bacterivory rates and grazing impact among various MF. The available data suggest that the chrysophytes are one of the most 'heterotrophic' algae, with high relative contribution of phagotrophy to their growth (Sanders et al 1990, Olrik 1998, Rottberger et al 2013) and high impact on the bacterial community in oligotrophic lakes (Bird & Kalff 1986, Schmidtke et al 2006, Unrein et al 2010. Nevertheless, some differences could be expected among genera or species belonging to the same class.…”

Section: Introductionmentioning

confidence: 99%

Presence, abundance and bacterivory of the mixotrophic algae Pseudopedinella (Dictyochophyceae) in freshwater environments

Gerea¹,

Saad²,

Izaguirre³

et al. 2016

Aquat. Microb. Ecol.

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Potential grazing impact of the mixotrophic flagellate Ochromonas sp. (Chrysophyceae) on bacteria in an extremely acidic lake

Cited by 41 publications

References 38 publications

A biochemical explanation for the success of mixotrophy in the flagellate Ochromonas sp.

A biochemical explanation for the success of mixotrophy in the flagellate Ochromonas sp.

Relative importance of phototrophic, heterotrophic, and mixotrophic nanoflagellates in the microbial food web of a river-influenced coastal upwelling area

Presence, abundance and bacterivory of the mixotrophic algae Pseudopedinella (Dictyochophyceae) in freshwater environments

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