Multiscale environmental heterogeneity in a large river-floodplain system

Mayora, Gisela; Scarabotti, Pablo Augusto; Schneider, Berenice; Alvarenga, Patricio; Marchese, Mercedes

doi:10.1016/j.jsames.2020.102546

Cited by 20 publications

(11 citation statements)

References 44 publications

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“…The environmental characterization of the sampling sites is presented in the Supporting Information Table S2 and detailed in the study by Mayora et al . (2020). Surface water samples for DNA extraction were collected in sterilized bottles and pre‐filtered through a 50 μm pore mesh to remove invertebrates.…”

Section: Methodsmentioning

confidence: 99%

“…In total, 10 samples from the main channel, secondary channels and floodplain lakes were obtained during periods of flood and drought in order to encompass the habitat types and the hydrological variability characteristic of the Paran a fluvial system. The environmental characterization of the sampling sites is presented in the Supporting Information Table S2 and detailed in the study by Mayora et al (2020). Surface water samples for DNA extraction were collected in sterilized bottles and prefiltered through a 50 μm pore mesh to remove invertebrates.…”

Section: Sampling Sites and Proceduresmentioning

confidence: 99%

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Freshwater protists: unveiling the unexplored in a large floodplain system

Metz

Huber

Accattatis

et al. 2021

Environmental Microbiology

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Protists play a fundamental role in all ecosystems, but we are still far from estimating the total diversity of many lineages, in particular in highly diverse environments, such as freshwater. Here, we survey the protist diversity of the Paran a River using metabarcoding, and we applied an approach that includes sequence similarity and phylogeny to evaluate the degree of genetic novelty of the protists' communities against the sequences described in the reference database PR 2 . We observed that $28% of the amplicon sequence variants were classified as novel according to their similarity with sequences from the reference database; most of them were related to heterotrophic groups traditionally overlooked in freshwater systems. This lack of knowledge extended to those groups within the green algae (Archaeplastida) that are well documented such as Mamiellophyceae, and also to the less studied Pedinophyceae, for which we found sequences representing novel deep-branching clusters. Among the groups with potential novel protists, Bicosoecida (Stramenopiles) were the best represented, followed by Codosiga (Opisthokonta), and the Perkinsea (Alveolata). This illustrates the lack of knowledge on freshwater planktonic protists and also the need for isolation and/or cultivation of new organisms to better understand their role in ecosystem functioning.

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Section: Methodsmentioning

confidence: 99%

Section: Sampling Sites and Proceduresmentioning

confidence: 99%

Freshwater protists: unveiling the unexplored in a large floodplain system

Metz

Huber

Accattatis

et al. 2021

Environmental Microbiology

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“…Para humedales del Alto Paraná, N. marina fue mencionada entre las hidrófitas raras que, a su vez, pueden ser abundantes localmente, dependiendo de las condiciones de transparencia, profundidad y sustrato (Neiff 1986). Esto concuerda con nuestras observaciones en el Bajo Paraná donde la especie tuvo una rareza a escala de paisaje, por ser registrada en solo una de 19 lagunas estudiadas en detalle (Mayora et al, 2020); y una dominancia a escala local, por presentar alta cobertura en la zona limnética de tal laguna aislada de un cauce activo (Fig. 1 C-D).…”

Section: Rasgos Biológicos Y Hábitatunclassified

Primer registro de Najas marina (Hydrocharitaceae) y listado florístico de hidrófitas sumergidas en el Bajo Paraná (Argentina)

Schneider

2020

LIL

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Se comunica el registro de Najas marina L., una hidrófita completamente sumergida, en el Bajo Paraná (Argentina) como nueva cita para su flora y se revisan brevemente aspectos de su ecología (rasgos biológicos, hábitat y distribución). Además, se presen- ta un listado de las 24 especies de hidrófitas sumergidas (en 12 familias y 15 géneros) que han sido registradas para la extensa planicie de inundación del Bajo Paraná.

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“…The hydrological regime is considered to be the factor that governs the functioning of the system and that maintains its ecological integrity (Power, 1995;Ward & Stanford, 1995;Bellmore, Baxter, Martens & Connolly, 2013). It connects biogeochemical processes (Tabacchi et al , 1998;Fisher, Heffernan, Sponseller & Welter, 2007;Hamilton, 2010), modulates the fate and storage of organic matter (Casco, Galassi, Mari, Poi & Neiff, 2016;Mayora, Scarabotti, Schneider, Alvarenga & Marchese, 2020), and enables the high biodiversity that these systems sustain with organism cycles coupled to a large extent to water level fluctuations (Neiff, 1990;Ward, Tockner & Schiemer, 1999;Thomazet al , 2007). Hence, understanding the hydrological dynamic is an important feature to partially elucidate the functioning of the river as well as the biological communities' assembly.…”

Section: Introductionmentioning

confidence: 99%

Chaos arising from the hydrological behaviour of a floodplain river during the last century

Giri

Devercelli

2021

Preprint

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The hydrological regime is the main factor governing the functioning of floodplain rivers. A full comprehension of its dynamic leads to a better understanding of the system’s behaviour and of the proper methods that must be used. We analysed the daily water level of the Paraná River during the last century at three gauge stations using linear and non-linear tools to characterise the hydrological dynamic and to analyse to what extent chaotic behaviour prevails. The three water level time series were characterised as non-linear and non-stationary by power spectrum, autocorrelation function, and surrogate test analyses. A strange attractor was developed when the phase space was reconstructed, having a low dimensional chaos supported by correlation dimension, positive maximum Lyapunov exponents, and recurrence quantification analysis. In line with this, the system resulted unpredictable with a threshold by sample entropy, and with an intermediate hydrological complexity, while Hurst exponent characterised the system as persistent and with sensitive dependence on initial conditions. In a general overview, all the evidence obtained indicates that the Paraná River’s behaviour is at the edge of chaos. A latitudinal gradient of decreasing chaoticity was observed as the floodplain extent increased, whereas complexity was highest at the intermediate river station due to the inflow of tributaries with different hydrology. This paper attempts to offer some additional insights for understanding the hydrological behaviour of floodplain rivers and the proper methods to understand their complexity.

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Multiscale environmental heterogeneity in a large river-floodplain system

Cited by 20 publications

References 44 publications

Freshwater protists: unveiling the unexplored in a large floodplain system

Freshwater protists: unveiling the unexplored in a large floodplain system

Primer registro de Najas marina (Hydrocharitaceae) y listado florístico de hidrófitas sumergidas en el Bajo Paraná (Argentina)

Chaos arising from the hydrological behaviour of a floodplain river during the last century

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