Estudio Ficológico Y Bacteriológico De Una Laguna Urbana De Uso Recreativo (Santa Fe, Argentina)

Polla, Wanda; Bainotti, María Fernanda; Novoa, Martín David

doi:10.14409/natura.v1i47.5985

Cited by 3 publications

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“…The Shannon index and Margalef index were calculated as per Yang et al (2016). The water quality was evaluated by Saprobic index according to previous studies (Junqueira et al, 2010;Galán et al, 2011;Polla et al, 2016;Taboada et al, 2018).…”

Section: Physiochemical Measurement Phytoplankton Identifi Cation and Enzyme Activities Determinationmentioning

confidence: 99%

Effects of phytoplankton community and interaction between environmental variables on nitrogen uptake and transformations in an urban river

et al. 2021

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Phytoplankton are not only the main bearer of the nitrogen cycle, but also a key link driving nitrogen cycle. However, most phytoplankton cannot directly use N 2 , and they must uptake nitrogenous nutrients (ammonium, nitrate, and urea) to meet their photosynthesis needs. We examined the uptake characteristics of several nitrogenous substrates using stable isotope technique and identifi ed the potential nitrogen transformations in the Fenhe River. Results revealed that spring phytoplankton community composed of mainly Fragilaria , Ulothrix , Microcystis , and Synedra . Urea can meet the spring partial nitrogen requirement of phytoplankton. The large uptake rate of urea depended on urease, chlorophyll a , and nitrate concentrations as shown in random forest models. Cyanobacteria explained more than 42.8% of the total abundance at all sites in summer. Upstream was dominated by Actinastrum , and Chlorella was relevant in the downstream section. The uptake rates of ammonium were higher than those of nitrate and urea. In addition, the random forest model demonstrated that ammonium, urease, and dissolved oxygen (DO) were the major contributors to the ammonium uptake rates. Ammonium was taken up preferentially in autumn and phytoplankton ( Cyclotella , Chlorella , and Pseudanabaena ) appeared to be able to respond to changes in nitrogen forms by adjusting their community composition. Structural equation models demonstrated that temperature-induced changes in DO directly aff ected the transformations of diff erent forms of nitrogen. At the same time, dissolved organic carbon can directly act on nutrients and then indirectly aff ect enzyme activity. There were great diff erences in the positive and negative eff ects of diff erent paths in the process of nitrate reduction to nitrite and then reduction to ammonium in time and space. These fi ndings provide a better understanding of the underlying mechanism of nitrogen uptake and the infl uences of interaction between environmental variables on nitrogen transformations in urban river ecosystems.

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Section: Physiochemical Measurement Phytoplankton Identifi Cation and Enzyme Activities Determinationmentioning

confidence: 99%

Effects of phytoplankton community and interaction between environmental variables on nitrogen uptake and transformations in an urban river

et al. 2021

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“…Consequently, it affects the specific richness of higher trophic levels and plays a key role in the structuration of aquatic ecosystems (Zalocar de Domitrovic et al, 2014). Phytoplankton density, diversity, and biovolume are considered good indicators of environmental disturbances, such as eutrophication and contamination from different sources (Borics et al, 2014;Frau et al, 2018;Polla et al, 2016). On the other hand, zooplankton plays a key role in aquatic ecosystems as consumers of microalgae and particulate matter, as well as a trophic resource for zooplanktivorous fishes (Mbandzi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Plankton Community Responses to Anthropogenic Pollution in an Argentinian Urban Reserve

Vaschetto

Regaldo

Polla

et al. 2021

Water Air Soil Pollut

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parameters, nutrients, chemical oxygen demand (COD), biological oxygen demand (BOD 5 ), and concentrations of potentially toxic metals (Cu, Cr, Pb, and Cd) in water and benthic sediments were analyzed in four sampling sites. The heavy metal geo-accumulation index (Igeo) was also calculated. Quali-quantitative analysis of phytoplankton and zooplankton samples was performed and summarized in ecological attributes and indices: Total density, specific richness, Shannon's diversity index, Simpsons' dominance index, and evenness index, as well as phytoplanktonic biovolume and functional groups. Except Cu, metal concentrations in water exceeded recommended limits for freshwaters in 37.5% (Cr), 31.3% (Pb), and 18.8% (Cd) of samples. Igeo revealed that sediments were moderately, highly, and very seriously polluted with Cu, Cr, and Pb, respectively. Phytoplankton showed the predominance of functional groups typical of eutrophic and low-flow environments, with high concentrations of nutrients. Cyanobacterial blooms occurred in 75% of the samples, considered high-risk events for the aquatic life and users of the urban reserve. The zooplankton community was dominated by microzooplankton, characterized by smaller species, more tolerant to polluted and eutrophic waters. This survey evidences the urgent need to develop a comprehensive management plan for the area.

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Bacteriological and eutrophication risk assessment of an Argentinian temperate shallow urban lagoon

Crettaz-Minaglia¹,

Gianello

2023

Environ Sci Pollut Res

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Estudio Ficológico Y Bacteriológico De Una Laguna Urbana De Uso Recreativo (Santa Fe, Argentina)

Cited by 3 publications

References 0 publications

Effects of phytoplankton community and interaction between environmental variables on nitrogen uptake and transformations in an urban river

Effects of phytoplankton community and interaction between environmental variables on nitrogen uptake and transformations in an urban river

Plankton Community Responses to Anthropogenic Pollution in an Argentinian Urban Reserve

Bacteriological and eutrophication risk assessment of an Argentinian temperate shallow urban lagoon

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