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Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters
Haptophytes were the most important mixotrophic group and have a key role as bacterivores in marine ecosystems, when considered alongside the widespread distribution of haptophytes in the ocean.
Significant year‐round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system
Soluble reactive phosphorus concentration was negatively correlated with the ingestion rate of both groups of PF, suggesting that mixotrophic flagellates would be using their phagotrophic capability to obtain phosphorus when this nutrient is limiting.
Factors Controlling the Year-Round Variability in Carbon Flux Through Bacteria in a Coastal Marine System
Changes in bacterioplankton assemblage structure were not coupled to changes in ecosystem functioning, at least in bacterial carbon use, and suggests that both low molecular weight dissolved organic matter released by phytoplankon, and high molecular weight DOM in periods of low Chl a, can enhance BHP.
Grazing rates and functional diversity of uncultured heterotrophic flagellates
Grazing rates of uncultured protists in natural assemblages are measured and their prey preference over several bacterial tracers in short-term ingestion experiments are investigated, revealing important functional differences between distinct unculturing protists and offers the possibility to disentangle the complexity of microbial food webs.
Changes in phytoplankton community along a transversal section of the Lower Paraná floodplain, Argentina
- F. Unrein
- Environmental ScienceHydrobiologia
Interactions between the main stream of large rivers and their floodplains are usually observed, determining gradual changes in environmental variables along a transversal axis. This paper studies…
Metabolic diversity of heterotrophic bacterioplankton over winter and spring in the coastal Arctic Ocean.
- M. Sala, R. Terrado, C. Lovejoy, F. Unrein, C. Pedrós-Alió
- Environmental ScienceEnvironmental microbiology
- 1 April 2008
Bacterioplankton metabolism seemed to be influenced by resuspension, advection, and sedimentation events that contributed organic matter that enhanced bacterial metabolism, suggesting oligotrophy in the winter surface waters.
Nutrient dynamics in the deltaic floodplain of the Lower Paraná River
Typology of lentic water bodies at Potter Peninsula (King George Island, Antarctica) based on physical-chemical characteristics and phytoplankton communities
During austral summer 1995/1996, 26 ultraoligotrophic to hypereutrophic ponds and lakes on Potter Peninsula were characterized on the basis of abiotic factors and the phytoplankton community to show that the characteristics of each catchment strongly influenced the abiotic parameter accounting for the obtained lake and pond ordination.
Protist Herbivory: a Key Pathway in the Pelagic Food Web of Lake Tanganyika
Evidence is provided that NF and PCya were tightly coupled in Lake Tanganyika and that herbivory by protists may be one of the reasons why this great lake has high productivity, and support is brought to the idea that microbial Herbivory is a major process in oligotrophic freshwater systems.
Abundance and distribution of picoplankton in tropical, oligotrophic Lake Kivu, eastern Africa
- H. Sarmento, F. Unrein, M. Isumbisho, Stéphane Stenuite, J. Gasol, J. Descy
- Environmental Science
- 1 April 2008
A review of PPP concentration across aquatic systems suggests that the abundance of Synechococcus-like cyanobacteria in large, oligotrophic, tropical lakes is very high, apparently contradicts the view that PPP abundance increases with increasing eutrophy.