Gaps and challenges in the knowledge of algal biodiversity in Paraguay

Rosset, Vitória Kalana; Bartozek, Elaine Cristina Rodrigues; Lambrecht, Richard W.; Auricchio, Marina Ramos; Santos, Melissa Dos; Peres, Cleto Kaveski

doi:10.1080/00318884.2020.1830597

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…con un único representante (Tabla 2). Esta riqueza corresponde al 21% de las especies conocidas para Paraguay (Rosset et al, 2020). Los géneros con más especies en el Phylum Bacillariophyta corresponden a: Eunotia Ehrenberg, 1837, las cuales están caracterizadas por encontrarse en ambientes neutros a ácidos y situaciones oligotróficas (Ortiz-Lerín & Cambra, 2007); Pinnularia Ehrenberg, 1843, cuyas especies son de hábito solitario, rara vez en cadenas, encontrándose en aguas dulces, limpias y de bajo pH (Toledo y Comas, 2011); y Nitzschia Hassall, 1845, distribuida en aguas dulces y saladas, bastante tolerantes a cambios ambientales (Rivera Ramírez, 1985).…”

Section: -9unclassified

Untitled

2022

Rep. cient. FACEN

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Resumen: Los humedales son considerados sistemas biológicos dinámicos y productivos, debido a que el agua se encarga de producir un ambiente mixto. Las algas tienen un rol importante desde los servicios ecosistémicos que desarrollan, entre ellos los de soporte y regulación, vinculados a la producción primaria, al ciclaje de nutrientes, a la producción de oxígeno atmosférico y a la purificación del agua. El objetivo de este trabajo fue aportar información respecto a la riqueza y composición de especies de la ficoflora del departamento de Ñeembucú. Para ello se tomaron muestras de agua en los distritos Tacuaras y Villa Franca, del departamento de Ñeembucú -Paraguay, en ocho campañas de muestreo, durante los meses de octubre de 2020 a julio de 2021. Se colectaron 32 muestras, incluyendo tomas directas de agua y muestras filtradas con red de plancton provenientes de cuerpos de agua temporales y permanentes, conservadas en lugol acético para su posterior observación. Para el recuento e identificación de las algas se utilizó el método de sedimentación de Utermölh. Se encontraron 185 especies de algas distribuidas en siete phylum: Bacillariophyta (63 especies), Charophyta (53 especies), Chlorophyta (41 especies), Cryptophyta (una especie), Cyanophyta (ocho especies), Euglenophyta (17 especies), y Ochrophyta (dos especies). La mayoría de las especies identificadas corresponden a medios dulceacuícolas oligotróficos. Este trabajo representa un aporte para aumentar el conocimiento de la diversidad algal del departamento de Ñeembucú.

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Section: -9unclassified

Untitled

2022

Rep. cient. FACEN

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“…Despite global concern for wetland habitats and the ecosystem goods and services they provide, little is known about the extent of wetland conversion in South America (Junk, 2013). Paraguay is one of South America's least studied countries, and even less is known about the largest wetland within Paraguay's administrative boundaries, the Ñeembucú Wetlands Complex (Kandus et al, 2018;Pett and Wyer, 2020;Rosset et al, 2020). The Ñeembucú Wetlands Complex lies within the Paraguay-Paraná-La Plata River system, which has the 9 th highest water discharge into oceans and 5 th highest drainage area of rivers worldwide (Milliman and Meade, 1983;Junk, 2013).…”

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confidence: 99%

Wetland loss in the Ñeembucú Wetlands Complex, Paraguay, using remote sensing

O'Leary

2022

Preprint

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South American wetlands are of global importance, yet limited delineation and monitoring restricts informed decision-making around the drivers of wetland loss. A growing human population and increasing demand for agricultural products has driven wetland loss and degradation in the Neotropics. Understanding of wetland dynamics and land use change can be gained through wetland monitoring. The Ñeembucú Wetlands Complex is the largest wetland in Paraguay, lying within the Paraguay-Paraná-La Plata River system. This study aims to use remotely sensed data to map land cover between 2006 and 2021, quantify wetland change over the 15-year study period and thus identify land cover types vulnerable to change in the Ñeembucú Wetlands Complex. Forest, dryland vegetation, vegetated wetland and open water were identified using Random Forest supervised classifications trained on visual inspection data and field data. Annual change of -0.34, 4.95, -1.65, 0.40 was observed for forest, dryland, vegetated wetland and open water, respectively. Wetland and forest conversion is attributed to agricultural and urban expansion. With ongoing pressures on wetlands, monitoring will be a key tool for addressing change and advising decision-making around development and conservation of valuable ecosystem goods and services in the Ñeembucú Wetlands Complex.

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“…The combination of assessing different endpoints, such as photosynthetic and biochemical changes, help to elucidate the mechanisms affected under different stressful scenarios(Baracho et al 2019). The freshwater microalga Ankistrodesmus densus is widely distributed worldwide (e.g., John and Tsarenko 2002;Rosset et al 2020) and it is sensitive to several stressors, such as Cd, P, and nanoparticles(Barreto …”

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Changes in photosynthetic parameters and lipid classes of N-limited freshwater microalga under cadmium exposure

Rocha

Parrish

Espíndola

2022

Preprint

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In the environment, algae are exposed to non-optimal conditions and adapt their physiology to cope with adverse conditions, such as limiting nutrients or excess contaminants. The present study evaluated the changes in photosynthetic parameters and lipid classes of the freshwater green microalga Ankistrodesmus densus exposed to nitrogen (N) limitation and cadmium (Cd) exposure. While N is required for the algal metabolism, Cd does not present known functions in freshwater microalgae. Our results indicate that the growth rate was more affected by metal than by the nutrient. At the same time, the quenchings, i.e., fractions of light energy driven to photochemical or non-photochemical processes of photosynthesis, were not affected under the N limitation. However, in the combination of the two stressors, the changes were more pronounced, suggesting a synergism in the growth rate, chlorophyll a production, photochemical quenching (qP), and effective quantum yield ((Y(II)). While Cd did not affect any lipid classes, the percentage of storage lipids (triacylglycerol) was increased under N limitation and in some of the combinations of N limitation and Cd. However, in the combination of the stressors, there were some non-linear changes in structural lipids (phospholipids) and a decrease in acetone mobile polar lipids. Our data indicate that the combination of the two stressors affected algal physiology with synergism in several parameters. However, the algal photoprotective mechanisms effectively avoided photodamage, as indicated by non-photochemical quenchings (qN and NPQ) and in the quantum yield related to regulated energy loss Y (NPQ) values.

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Gaps and challenges in the knowledge of algal biodiversity in Paraguay

Cited by 6 publications

References 18 publications

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Wetland loss in the Ñeembucú Wetlands Complex, Paraguay, using remote sensing

Changes in photosynthetic parameters and lipid classes of N-limited freshwater microalga under cadmium exposure

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