Abundance and size structure of planktonic protist communities in a Neotropical floodplain: effects of top-down and bottom-up controls

Meira, Bianca Ramos; Lansac‐Tôha, Fernando Miranda; Segóvia, Bianca Trevizan; Oliveira, Felipe Rafael de; Buosi, Paulo Roberto Bressan; Jati, Susicley; Rodrigues, Luzia Cleide; Velho, Luiz Felipe Machado

doi:10.1590/s2179-975x6117

Cited by 4 publications

(3 citation statements)

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“…This fraction of the community is favored in their development due to their high surface-volume ratio, which allows for rapid and efficient absorption of the available nutrients, even in an oligotrophic at mesotrophic environment (Lewis Junior, 1976;Naselli-Flores et al, 2007). This contribution is very important because even though these organisms represent low biomass values, they are the ones that effectively participate in the process of energy transference to higher levels of the trophic chain (Meira et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

The phytoplankton community as a descriptor of environmental variability: a case study in five reservoirs of the Paraná River basin

2022

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Aim We aimed to characterize the structure of the phytoplankton community and identify the main environmental factors driving the community in five reservoirs constructed in the region of the high Paraná River. Methods The phytoplankton and environmental variables were collected at the lacustrine region of the reservoir, between November 2013 and November 2014, with interval between collections ranged from 3 to 6 months. The richness and biomass of the phytoplankton community were measured as a response to the spatial and temporal environmental variability. Data from environmental variables was analyzed by Principal Component Analysis (PCA). Non-Metric Multidimensional Scaling Analyzes (NMDS) were performed on the richness and biomass data of the phytoplankton community. Results We identified 80 taxa distributed in 11 taxonomic classes, from which Cyanobacteria and Chlorophyceae were best represented. We did not observe significant temporal variation for either environmental variables or attributes of the phytoplankton community, which may be related to the prolonged drought in this period in the Brazilian Southwest. Higher phytoplankton richness and biomass were found in the Três Irmãos (Tiete River), reservoir located in the most anthropized basin in the country. Cyanobacteria and dinoflagellates dominated the biomass in all reservoirs during the studied period. The Ilha Solteira, Jupiá and Porto Primavera reservoirs showed a tendency to decrease in the values of phytoplankton richness and biomass, and the reservoirs built in series in the Paraná River probably have strong interdependence, according to the CRCC concept. Conclusions Spatial variation in phytoplankton attributes was influenced mainly by the position occupied by the reservoir in the hydrographic basin, water retention time (RT) and nutrient concentrations in each reservoir.

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Section: Discussionmentioning

confidence: 99%

The phytoplankton community as a descriptor of environmental variability: a case study in five reservoirs of the Paraná River basin

2022

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“…or predation, respectively. Several studies have pointed to a positive correlation between the abundances of prokaryotic and heterotrophic flagellates (4,(18)(19)(20). Yet, it is unclear to what extent such biotic relationships can generate biogeography in MAST-4.…”

Section: Significancementioning

confidence: 99%

Niche adaptation promoted the evolutionary diversification of tiny ocean predators

Latorre

Deutschmann

Labarre

et al. 2021

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

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Unicellular eukaryotic predators play a crucial role in the functioning of the ocean ecosystem by recycling nutrients and energy that are channeled to upper trophic levels. Traditionally, these evolutionarily diverse organisms have been combined into a single functional group (heterotrophic flagellates), overlooking their organismal differences. Here, we investigated four evolutionarily related species belonging to one cosmopolitan group of uncultured marine picoeukaryotic predators: marine stramenopiles (MAST)-4 (species A, B, C, and E). Co-occurrence and distribution analyses in the global surface ocean indicated contrasting patterns in MAST-4A and C, suggesting adaptation to different temperatures. We then investigated whether these spatial distribution patterns were mirrored by MAST-4 genomic content using single-cell genomics. Analyses of 69 single cells recovered 66 to 83% of the MAST-4A/B/C/E genomes, which displayed substantial interspecies divergence. MAST-4 genomes were similar in terms of broad gene functional categories, but they differed in enzymes of ecological relevance, such as glycoside hydrolases (GHs), which are part of the food degradation machinery in MAST-4. Interestingly, MAST-4 species featuring a similar GH composition (A and C) coexcluded each other in the surface global ocean, while species with a different set of GHs (B and C) appeared to be able to coexist, suggesting further niche diversification associated with prey digestion. We propose that differential niche adaptation to temperature and prey type has promoted adaptive evolutionary diversification in MAST-4. We show that minute ocean predators from the same phylogenetic group may have different biogeography and genomic content, which needs to be accounted for to better comprehend marine food webs.

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“…bacteria, algae, Dissolved Organic Carbon) or predation respectively. A number of studies pointed to a positive correlation between prokaryotic and heterotrophic flagellates' abundances (18)(19)(20)(21); yet, it is unclear to what extent such biotic relationships can generate biogeography in MAST-4.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary diversification of tiny ocean predators

Latorre¹,

Deutschmann²,

Labarre³

et al. 2020

Preprint

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Unicellular eukaryotic predators have a crucial role in the functioning of the ocean ecosystem by recycling nutrients and energy that are channeled to upper trophic levels. Traditionally, these evolutionary-diverse organisms have been combined into a single functional group (Heterotrophic flagellates), overlooking their organismal differences. Here we investigate four evolutionary related species belonging to one cosmopolitan family of uncultured marine picoeukaryotic predators: MAST-4 (species A, B, C, and E). Co-occurrence and distribution analyses in the global surface ocean indicated contrasting patterns in MAST-4A & C, suggesting adaptation to different temperatures. We then investigated whether these spatial distribution patterns were mirrored by MAST-4 genomic content using Single-Cell Genomics. Analyses of 69 single-cells recovered 66-83% of the MAST-4A/B/C/E genomes, which displayed substantial inter-species divergence. MAST-4 genomes were similar in terms of broad gene functional categories, but they differed in enzymes of ecological relevance, such as glycoside hydrolases (GHs), which are part of the food degradation machinery in MAST-4. Interestingly, MAST-4 species featuring a similar GH composition co-excluded each other (A & C) in the surface global ocean, while species with a different set of GHs appeared to be able to co-exist (species B & C) suggesting further niche diversification associated to prey digestion. We propose that differential niche adaptation to temperature and prey type has promoted adaptive evolutionary diversification in MAST-4. Altogether, we show that minute ocean predators from the same family may have different biogeography and genomic content, which need to be accounted to better comprehend marine food webs.

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Abundance and size structure of planktonic protist communities in a Neotropical floodplain: effects of top-down and bottom-up controls

Cited by 4 publications

References 47 publications

The phytoplankton community as a descriptor of environmental variability: a case study in five reservoirs of the Paraná River basin

The phytoplankton community as a descriptor of environmental variability: a case study in five reservoirs of the Paraná River basin

Niche adaptation promoted the evolutionary diversification of tiny ocean predators

Evolutionary diversification of tiny ocean predators

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