Phosphorus gain by bacterivory promotes the mixotrophic flagellate Dinobryon spp. during re-oligotrophication

Kamjunke, Norbert; Henrichs, Tanja; Gaedke, Ursula

doi:10.1093/plankt/fbl054

Cited by 61 publications

(53 citation statements)

References 28 publications

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“…Independent culture studies have shown that some marine and freshwater algae can acquire scarce nutrients, such as phosphorus and iron, using bacterivory (22,23). There are also field reports from nongyre regions that rates of bacterivory by plastidic protists between 3 and 5 μm and larger than 5 μm negatively correlate with the concentration of soluble reactive phosphorus or iron (16,17).…”

Section: Discussionmentioning

confidence: 99%

Mixotrophic basis of Atlantic oligotrophic ecosystems

Hartmann

Grob²,

Tarran³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

263

260

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Oligotrophic subtropical gyres are the largest oceanic ecosystems, covering >40% of the Earth's surface. Unicellular cyanobacteria and the smallest algae (plastidic protists) dominate CO 2 fixation in these ecosystems, competing for dissolved inorganic nutrients. Here we present direct evidence from the surface mixed layer of the subtropical gyres and adjacent equatorial and temperate regions of the Atlantic Ocean, collected on three Atlantic Meridional Transect cruises on consecutive years, that bacterioplankton are fed on by plastidic and aplastidic protists at comparable rates. Rates of bacterivory were similar in the light and dark. Furthermore, because of their higher abundance, it is the plastidic protists, rather than the aplastidic forms, that control bacterivory in these waters. These findings change our basic understanding of food web function in the open ocean, because plastidic protists should now be considered as the main bacterivores as well as the main CO 2 fixers in the oligotrophic gyres.

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Section: Discussionmentioning

confidence: 99%

Mixotrophic basis of Atlantic oligotrophic ecosystems

Hartmann

Grob²,

Tarran³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

263

260

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“…It should be further noted that, in reality, a major carbon and nutrient source for mixotrophs is often bacteria (Mitra et al, 2014), which is not explicitly modelled in this study, but is implicitly represented by the POM pool, P content of which is known, but C content is assumed to be proportional to P by the Red eld ratio. Further resolution of the microbial loop and the organic matter pools in Lake Bourget would be out of the scope of the current study, but constitutes a potential future goal, as with ongoing oligotrophication, relative importance of mixotrophs in the system can be anticipated to increase (Kamjunke et al, 2007;Mitra et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Modelling the plankton groups of the deep, peri-alpine Lake Bourget

Kerimoglu

Jacquet²,

Vinçon‐Leite

et al. 2017

Ecological Modelling

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Predicting phytoplankton succession and variability in natural systems remains to be a grand challenge in aquatic ecosystems research. In this study, we identi ed six major plankton groups in Lake Bourget (France), based on cell size, taxonomic properties, food-web interactions and occurrence patterns: cyanobacterium Planktothrix rubescens, small and large phytoplankton, mixotrophs, herbivorous and carnivorous zooplankton. We then developed a deterministic dynamic model that describes the dynamics of these groups in terms of carbon and phosphorus uxes, as well as of particulate organic phosphorus and dissolved inorganic provide evidence for the hypothesis that the abundance of this species before the onset of strati cation is critical for its success later in the growing season, pointing thereby to a priority e ect.

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“…Moreover, phagotrophy in photosynthetic Haptophyta was well described in genus Chrysochromulina (Legrand et al, 2001), a genus observed in various lakes (Temponeras et al, 2000). Mixotrophy may then provide a competitive advantage over both purely phototrophic microalgae (including cyanobacteria) and non-pigmented protists (Stickney et al, 2000;Domaizon et al, 2003;Troost et al, 2005;Kamjunke et al, 2007) in oligotrophic systems and/or in situation of phosphorous depletion (epilimnion in summer stratification). Even though we need further investigations to define the importance of this process, some of the Haptophyta revealed in these lakes could be bacterivorous.…”

mentioning

confidence: 98%

Vertical structure of small eukaryotes in three lakes that differ by their trophic status: a quantitative approach

et al. 2010

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In lakes, the diversity of eukaryotic picoplankton has been recently studied by the analysis of 18S ribosomal RNA gene sequences; however, quantitative data are rare. In this study, the vertical structure and abundance of the small eukaryotic size fraction (0.2-5 lm) were investigated in three lakes by tyramide signal amplification-fluorescent in situ hybridization targeting six phylogenetic groups: Chlorophyta, Haptophyta, Cercozoa, LKM11, Perkinsozoa and fungi. The groups targeted in this study are found in all lakes; however, both the abundance and structure of small eukaryotes are dependent on the system's productivity and depth. These data highlighted the presence of Chlorophyta contributing on an average to 19.3%, 14.7% and 41.2% of total small eukaryotes in lakes Bourget, Aydat and Pavin, respectively. This study also revealed the unexpected importance of Haptophyta, reaching 62.8% of eukaryotes in the euphotic zone of Lake Bourget. The high proportions of these pigmented cells highlight the underestimation of these groups by PCR-based methods. The presence of pigmented Chlorophyta in the deepest zones of the lakes suggests a mixotrophic behaviour of these taxa. We also confirmed the presence of putative parasites such as Perkinsozoa (5.1% of small eukaryotes in Lake Pavin and Bourget) and, with lower abundances, fungi (targeted by the MY1574 probe). Cells targeted by LKM11 probes represented the second group of abundance within heterotrophs. Open questions regarding the functional roles of the targeted groups arise from this study, especially regarding parasitism and mixotrophy, which are interactions poorly taken into account in planktonic food web models.

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Phosphorus gain by bacterivory promotes the mixotrophic flagellate Dinobryon spp. during re-oligotrophication

Cited by 61 publications

References 28 publications

Mixotrophic basis of Atlantic oligotrophic ecosystems

Mixotrophic basis of Atlantic oligotrophic ecosystems

Modelling the plankton groups of the deep, peri-alpine Lake Bourget

Vertical structure of small eukaryotes in three lakes that differ by their trophic status: a quantitative approach

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