Biodiversity in Pristine Wetlands of Central Brazil: a Multi-Taxonomic Approach

Fonseca, Bárbara Medeiros; Mendonça-Galvão, Luciana de; Sousa, Francisco Diogo Rocha; Elmoor-Loureiro, Lourdes M. A.; Gomes-e-Souza, Maria Beatriz; Pinto, Ricardo L.; Petracco, Paula; Oliveira, Regina Célia de; Lima, Elizângela de Jesus

doi:10.1007/s13157-017-0964-7

Cited by 20 publications

(12 citation statements)

References 53 publications

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“…Cyanobacteria, the second group in terms of species richness, have also been reported as an important component in Cerrado acidic wetlands (Fonseca et al 2018), represented mainly by branched heterocytous taxa (e.g. Scytonema, Stigonema, Hapalosiphon), which were commonly reported here as well, under similar ecological conditions.…”

Section: Discussionsupporting

confidence: 79%

“…According to Komárek (2013, p. 439), however, it is "usually in strictly alkaline, stagnant or slowly streaming waters". This explains why this taxon has not been mentioned in previous studies on Cyanobacteria from Cerrado acidic environments, where genera such as Stigonema, Hapalosiphon and Scytonema are more common (Senna & Ferreira 1987;Fonseca et al 2018). The environmental conditions found in PETeR, on the other hand, favor the occurrence of such alkaliphilic taxa.…”

Section: Some Rare or Interesting Speciesmentioning

confidence: 84%

“…For this reason, these algae are frequently observed in Cerrado waters (Estrela et al 2011;Dunck et al 2013). Fonseca et al (2018) reported this group as the richest one among non-diatom periphytic algae in Cerrado wetlands. Some European floras have indicated many acidophilic taxa among Zygnematophyceae, and some of them were reported in our streams, highlighting here Cylindrocystis brebissonii, Closterium closterioides, Tetmemorus laevis, Micrasterias spp., Euastrum spp.…”

Section: Discussionmentioning

confidence: 98%

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Soft-bodied benthic algae in pristine Brazilian streams: from acid to karst

2019

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This study evaluated soft-bodied benthic algae from seven streams located in protected areas of central Brazil (Parque Nacional de Brasília, Parque Nacional da Chapada dos Veadeiros and Parque Estadual de Terra Ronca), and related them to abiotic factors. We addressed the following questions: A) how algal community structure in Cerrado streams is influenced by the marked seasonality typical of the region; and B) how karst geology influences algal communities in Parque Estadual de Terra Ronca, as compared to streams in other Cerrado areas. Samples were collected between 2012 and 2013 from a single site in each stream, and upstream and downstream of caves present in Parque Estadual de Terra Ronca. Altogether, 159 taxa were recorded. Algal community structure varied significantly among sites, but not between seasons, despite relatively lower abundances during the rainy season, likely due to a negative influence of the faster currents in streams during this period. Some alkaliphilic species were observed only at sites near caves (e.g. the cyanobacterium Tolypothrix distorta), while acidophilic taxa were more frequent in the other streams (e.g. desmids and Cyanobacteria such as Scytonema caldarium, Hapalosiphon stuhlmannii and Stigonema ocellatum). We observed a rare green alga, Microthamnion kuetzingianum, and reported the cyanobacterium Rivularia aquatica for the first time in Brazil.

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Section: Discussionsupporting

confidence: 79%

Section: Some Rare or Interesting Speciesmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 98%

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Soft-bodied benthic algae in pristine Brazilian streams: from acid to karst

2019

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“…Natural shallow ponds are widely distributed in Cerrado biome, presenting numerous plant species with different morphologies whose physical structure promotes considerable habitat heterogeneity in such ecosystems (sousa et al, 2014). The dominant taxa in these ecosystems are algae (periphyton and metaphyton), aquatic macrophytes, protozoa, and an impressive diversity of invertebrates, mainly Cladocera species (Bini et al, 2007;sousa et al, 2014;Fonseca and Estrela, 2015;Fonseca et al, 2017). Pond size is related to the length and width of the littoral zone, which displays the best ecological conditions in terms of oxygen and temperature (de marco Jr et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Pond size is related to the length and width of the littoral zone, which displays the best ecological conditions in terms of oxygen and temperature (de marco Jr et al, 2014). in these natural shallow ponds of the Cerrado, water levels vary from 20 to around 80 cm (Fonseca et al, 2017), it is not possible to delimit a pelagic zone.…”

Section: Introductionmentioning

confidence: 99%

Trophic relationships between primary producers and associated fauna in a pristine Cerrado pond

et al. 2019

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Ponds arising from groundwater in Cerrado of Central Brazil are oligotrophic but highly biodiverse environments. In this study, we used stable isotope ratios to test if there are variations in carbon and nitrogen acquisition by different primary food sources and if they are influenced by seasonality in a well-preserved pond. We hypothesized that periphyton is the main food source for macrophyte-associated fauna. We found that δ13C, but not δ15N, can distinguish between primary food sources; however, the isotopic signatures of food sources did not differ significantly between seasons. The δ15N values of macrophyte-associated fauna were significantly higher for predators compared with other trophic groups, but δ13C values did not differ significantly between groups. Emergent macrophytes and periphyton were the main food sources for scrapers (contribution of 42.5%) and collector-gatherers (contribution of 41.6%), respectively. Compared with emergent macrophytes, submerged macrophytes were associated with a greater abundance of fauna and algal biomass but were not a significant food source for associated fauna. Our findings demonstrate that in this small shallow oligotrophic pond in the Cerrado, the stable isotope ratios of carbon and nitrogen of food sources did not vary between seasons but did differ between aquatic macrophyte life forms. We point out the different functional roles of macrophyte life forms, with emergent macrophytes serving as an important food resource, while submerged macrophytes mainly provide physical structure.

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