Photosynthetic picoplankton in Lake Tanganyika: biomass distribution patterns with depth, season and basin

Stenuite, Stéphane; Tarbe, Anne-Laure; Sarmento, Hugo; Unrein, Fernando; Pirlot, Samuel; Sinyinza, Danny; Thill, Sophie; Lecomte, Mélanie; Leporcq, Bruno; Gasol, Josep M.; Descy, Jean-Pierre

doi:10.1093/plankt/fbp090

Cited by 32 publications

(44 citation statements)

References 47 publications

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“…In surface samples, the abundance of phycoerythrin-rich picocyanobacteria, identi fi ed as Synechococcus spp. (Sarmento et al 2007 ) , ranged between 0.5 × 10 5 and 2.0 × 10 5 cells mL −1 ) and were similar to those observed in Lake Tanganyika (Stenuite et al 2009a ) . Vertical depth pro fi les Using in situ fl uorometry, a permanent chlorophyll peak was detected just below the oxycline (ca.…”

Section: Prokaryotic Cell Abundances Biomass and Productionsupporting

confidence: 65%

“…The strong temporal coupling between phytoplankton biomass and bacterial abundance and the fact that bacterial carbon demand can be sustained by phytoplankton primary production suggest a preferential transfer of organic matter through the microbial food web in Lake Kivu . The pivotal role of the microbial food web was recently demonstrated in Lake Tanganyika (Tarbe et al 2011 ) , where photosynthetic picoplankton dominated autotrophic biomass and production (Stenuite et al 2009a, b ) . Picophytoplankton production and transfer to upper trophic levels should nevertheless be evaluated in Lake Kivu.…”

Section: Synthesis and Perspectivesmentioning

confidence: 96%

“…To date, only few studies reported abundance and production of picoplankton in East African Great lakes (Pirlot et al 2005 ;Sarmento et al 2008 ;Stenuite et al 2009a, b ) . Sarmento et al ( 2008 ) reported the fi rst data on bacterial abundances in Lake Kivu.…”

Section: Prokaryotic Cell Abundances Biomass and Productionmentioning

confidence: 99%

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Microbial Ecology of Lake Kivu

et al. 2012

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We review available data on archaea, bacteria and small eukaryotes in an attempt to provide a general picture of microbial diversity, abundances and microbedriven processes in Lake Kivu surface and intermediate waters (ca. 0-100 m). The various water layers present contrasting physical and chemical properties and harbour very different microbial communities supported by the vertical redox structure. For instance, we found a clear vertical segregation of archaeal and bacterial assemblages between the oxic and the anoxic zone of the surface waters. The presence of speci fi c bacterial (e.g. Green Sulfur Bacteria) and archaeal (e.g. ammonia-oxidising archaea) communities and the prevailing physico-chemical conditions point towards the redoxcline as the most active and metabolically diverse water layer. The archaeal assemblage in the surface and intermediate water column layers was mainly composed by the phylum Crenarchaeota , by the recently de fi ned phylum Thaumarchaeota and by the phylum Euryarchaeota . In turn, the bacterial assemblage comprised mainly ubiquitous members of planktonic assemblages of freshwater environments ( Actinobacteria , Bacteroidetes and Betaproteobacteria

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Section: Prokaryotic Cell Abundances Biomass and Productionsupporting

confidence: 65%

Section: Synthesis and Perspectivesmentioning

confidence: 96%

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Microbial Ecology of Lake Kivu

et al. 2012

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“…With regard to their spatial distribution, most Stramenopiles OTUs were recovered in the metalimnion. This is not surprising, as the metalimnion features a high bacterial abundance (Stenuite et al 2009) and a particular light regime, which can favour mixotrophy as an alternative to phototrophy.…”

Section: Stramenopilesmentioning

confidence: 96%

“…Li et al 1992, Zubkov et al 2000, Grob et al 2007, LT also harbours a plankton community highly dominated by picoplankton -both autotrophic and heterotrophic , Stenuite et al 2007. Flow cytometry counts allowed detection of picoeukaryote populations of around 2 × 10 3 cells ml -1 (Stenuite et al 2009). In addition, analysis by microscopy showed that the main picoplankton grazers in LT were heterotrophic flagellates in the size class 2-5 µm, which contributed up to 76% of the total heterotrophic flagellate abundance that ranged between 0.30 × 10 3 and 1.83 × 10 3 cells ml -1 .…”

Section: Introductionmentioning

confidence: 99%

Molecular characterisation of the small-eukaryote community in a tropical Great Lake (Lake Tanganyika, East Africa)

Tarbe

Stenuite

Balagué

et al. 2011

Aquat. Microb. Ecol.

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In aquatic environments, small eukaryotes (mainly algae and protozoa of 1 to 5 µm in size) are a key link in the carbon transfer to higher trophic levels, e.g. through primary production and grazing of picoplankton. However, the diversity of these microorganisms remains poorly investigated in freshwater habitats, and is still unknown in tropical aquatic systems. In this study, we investigated the small-eukaryote diversity in the oligotrophic Lake Tanganyika, one of the African Great Lakes, at different depths in the water column using denaturing gradient gel electrophoresis (DGGE) and gene clone libraries based on 18S rRNA genes. Each sample produced complex DGGE fingerprints clearly discriminating the epilimnion from the metalimnion. Analysis, using genetic libraries, confirmed the high level of small-eukaryote diversity in Lake Tanganyika. Organisms from 5 taxonomic groups (Stramenopiles, Alveolata, Cryptophyta, Kinetoplastea and Choanoflagellida) were dominant among the species detected. Some sequences were nearly identical to those recovered in temperate freshwaters in North America and Europe, suggesting a high dispersal ability in some small-eukaryote lineages. However, 49% of sequences were < 95% similar to any sequence in GenBank. This may result from undersampling of freshwater systems, but also raises the possibility that perennially warm tropical waters harbour particular assemblages of planktonic small eukaryotes.KEY WORDS: Small-eukaryote community · Tropical lake · 18S rRNA gene libraries Resale or republication not permitted without written consent of the publisher

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Food niches of planktonic rotifers: Diversification and implications

Gilbert

2022

Limnology & Oceanography

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The diverse diets of common planktonic rotifers are described in detail from field and laboratory observations and experiments. Also considered are methodological approaches, rotifer feeding mechanisms, and the availability in natural waters of less well-known food items (detritus, picoplankton, protozoans). Despite much variation among and within rotifer genera, food niches of planktonic rotifers can be subdivided into four broad, overlapping categories defined by the predominant types and sizes of food ingested: (1) microphagous rotifers that eat fine detritus/organic aggregates, picoplankton, and 2-10 μm nanoplankton; (2) polyphagous rotifers that eat the above items, larger nanoplankton, and small (20-50 μm) microplankton; (3) macrophagous algivores that eat 5-50 μm algae; and (4) macrophagous omnivores/predators that eat 5-250 μm algae, protozoans, and metazoans. These diet-based categories have ecological advantages over categories based on rotifer morphology or feeding mode. The information on diets assembled here is important for understanding: (1) the population dynamics of planktonic rotifers and their food organisms; (2) the position of rotifers in classical and microbial food webs;(3) the seasonality, spatial distribution, and species diversity of rotifers in plankton communities; and (4) food overlap, and thus potential resource competition, among planktonic protozoans, rotifers, and crustaceans.

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Photosynthetic picoplankton in Lake Tanganyika: biomass distribution patterns with depth, season and basin

Cited by 32 publications

References 47 publications

Microbial Ecology of Lake Kivu

Microbial Ecology of Lake Kivu

Molecular characterisation of the small-eukaryote community in a tropical Great Lake (Lake Tanganyika, East Africa)

Food niches of planktonic rotifers: Diversification and implications

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