Richness of periphytic algae and its relationship with hydrological attributes

Algarte, Vanessa Majewski; Siqueira, Natália Silveira; Ruwer, Daiane Trevisan; Osório, Nicolli Cristina; Rodrigues, Liliana

doi:10.1007/s40415-017-0383-2

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…High values of species richness were registered in May and February 2015, coinciding with high water level, and the lowest number of algal species was found in August 2014, which presented the lowest water levels of the Paraná River. Other studies performed in lentic and semi-lotic environments of the Upper Paraná River floodplain also registered higher species richness of periphytic algae during high-water periods (Rodrigues & Bicudo, 2004;Fonseca & Rodrigues, 2005;Algarte et al, 2009Algarte et al, , 2017Carapunarla et al, 2014;Biolo et al, 2015;Bichoff et al, 2016), in agreement with our results.…”

Section: Discussionsupporting

confidence: 92%

“…Chlorophyceans and desmids (which accounted for most species of Zygnemaphyceae) develop best at high temperatures (Coesel & Wardenaar, 1990;Vercellino & Bicudo, 2006;Murakami et al, 2009). Moreover, they are easily carried and distributed by water currents and establish in environments with abundant stands of macrophytes, which contribute to an increase in species number (Algarte et al, 2009(Algarte et al, , 2017Biolo et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Two stands of the aquatic macrophyte Eichhornia azurea (Sw.) Kunth were sampled in each lake. In each stand, at each of the five sampling periods, one petiole in adult stage was sampled (Schwarzbold, 1990;Algarte et al 2016;Bichoff et al, 2016;Algarte et al, 2017). We thus collected two petioles (n = 2) per site, totalling 30 samples.…”

Section: Sampling Of Periphytic Algal Communitiesmentioning

confidence: 99%

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Periphytic algal community in lentic environments of the Upper Paraná River floodplain: seasonal and spatial variation

2018

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Aim: This study aimed to evaluate the influence of seasonal variation in the hydrological regime and of limnological variables on species richness of periphytic algae in lakes of the Upper Paraná River floodplain. Methods The study area is located in the last undammed stretch of the Paraná River in this floodplain, in which three lakes were sampled quarterly (May, August and November 2014, and February and May 2015) for one year. The periphytic material was obtained from petioles of the aquatic macrophyte Eichhornia azurea (Sw.) Kunth. Results We registered 149 taxa of periphytic algae, distributed in 9 classes. Algal richness changed as a function of the seasonal dynamics of the Paraná River’s hydrological regime. Water level fluctuations directly influenced periphytic algae species. During periods of high water level, species richness increased. Limnological variables showed a close relationship with the hydrological regime, and the dissolved nutrients and turbidity were the abiotic factors that most influenced the algal community. The following species were present in all lakes: Fragilaria capucina Desmazières, Gomphonema gracile Ehrenberg and Navicula cryptotenella Lange-Bertalot (Bacillariophyceae) and two species of the genus Oedogonium (Oedogoniophyceae). Conclusions The hydrological regime of the Paraná River played an important role in structuring communities of periphytic algae. Seasonal variation in hydrological regime and in limnological variables together influenced the species richness of these organisms in these floodplain lakes.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Sampling Of Periphytic Algal Communitiesmentioning

confidence: 99%

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Periphytic algal community in lentic environments of the Upper Paraná River floodplain: seasonal and spatial variation

2018

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“…In this study, the peak time of terrestrial algae biomass in the high-velocity canal section was earlier than that in the low-velocity canal section. This is because high-velocity water flow accelerates material exchange between algae and the water body [ 50 , 51 ]. However, in actual research, high- velocity environmental water flow sometimes cannot effectively remove benthic algae; however, it will lead to an increase in filamentous taxa.…”

Section: Discussionmentioning

confidence: 99%

Reducing the Risk of Benthic Algae Outbreaks by Regulating the Flow Velocity in a Simulated South–North Water Diversion Open Channel

Sun

Liu

et al. 2023

IJERPH

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The reduction in open-channel flow velocity due to China’s South-to-North Water Diversion Project (SNP) increases the risk of benthic algal community blooms resulting in drinking water safety issues. Consequently, it has attracted attention from all walks of life. However, regulatory measures to mitigate the risk of algal blooms and the main risk-causing factors are unclear. This study simulated the river ecosystem of the SNP channel through water diversion. Simulated gradient-increasing river flow velocity affects environmental factors and benthic algal alterations, and can be used to explore the feasibility of regulating the flow velocity to reduce the risk of algal blooms. We found that the algal biomasses in the velocity environments of 0.211 and 0.418 m/s decreased by 30.19% and 39.88%, respectively. Community structure alterations from diatoms to filamentous green algae were 75.56% and 87.53%, respectively. We observed significant differences in biodiversity, especially in terms of richness and evenness. The α diversity index of a species is influenced by physical and chemical environmental factors (especially flow velocity). Our study revealed that flow velocity is the main factor affecting the growth and outbreak of benthic algae. The risk of algal blooms in open channels can be effectively mitigated by regulating the flow velocity. This provides a theoretical basis for ensuring the water safety of large-scale water conservancy projects.

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“…It further proves that the microbial ecosystem in flow-reduced river reaches are dysfunctional, and needs to regulate water flow to maintain the microbial ecosystem properly. In addition, the improvement of the alpha index of the bacterial community may be specifically attributed to the fact that the increase in water flow accelerates the material exchange between the bacterial community and the water column, which promotes microbial metabolic proliferation ( Tsai et al, 2013 ; Algarte et al, 2017 ). Microbial community structure showed positive ecological response with a flow gradient restoration, and the richness and diversity of the community were restored steadily.…”

Section: Discussionmentioning

confidence: 99%

The microbial community and functional indicators response to flow restoration in gradient in a simulated water flume

et al. 2022

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Flow reduction has greatly affected the river ecological systems, and it has attracted much attention. However, less attention has been paid to response to flow restoration, especially flow restoration in gradient. Flow regime of rivers may affect river functional indicators and microbial community structure. This study simulated the ecological restoration of the flow-reduced river reach by gradiently controlling the water flow and explores the ecological response of environmental functional indicators and microbial community structure to the water flow. The results showed that gross primary productivity (GPP), ecosystem respiration rate (ER) and some water quality indices such as chemical oxygen demand, total nitrogen, and total phosphorus (TP), exhibited positive ecological responses to flow restoration in gradient. GPP and ER increased by 600.1% and 500.2%, respectively. The alpha diversity indices of the microbial community increased significantly with a flow gradient restoration. Thereinto, Shannon, Simpson, Chao1, and Ace indices, respectively, increased by 16.4%, 5.6%, 8.6%, and 6.2%. Canonical correspondence analysis indicated that water flow, Dissolved oxygen and TP were the main influencing factors for changes in bacterial community structure. Microbial community structure and composition present a positive ecological response to flow restoration in gradient. This study reveals that the main variable in the restoration of the flow-reduced river reach is the flow discharge, and it provides a feasible scheme for its ecological restoration.

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Richness of periphytic algae and its relationship with hydrological attributes

Cited by 7 publications

References 23 publications

Periphytic algal community in lentic environments of the Upper Paraná River floodplain: seasonal and spatial variation

Periphytic algal community in lentic environments of the Upper Paraná River floodplain: seasonal and spatial variation

Reducing the Risk of Benthic Algae Outbreaks by Regulating the Flow Velocity in a Simulated South–North Water Diversion Open Channel

The microbial community and functional indicators response to flow restoration in gradient in a simulated water flume

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