Phytoplankton of the Paraguay and  Bermejo rivers

Domitrovic, Yolanda Zalocar de; Devercelli, Melina; Forastier, Marina E.

doi:10.1127/1612-166x/2014/0065-0034

Cited by 11 publications

(10 citation statements)

References 27 publications

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“…A significant positive relationship between river phytoplankton abundance or biomass and total phosphorus concentration has been observed in several studies (Basu & Pick, ; Hamilton et al, ; Wu et al, ). Phytoplankton is also susceptible to light limitation due to high turbidity caused by resuspension of solids in turbulent waters (Zalocar de Domitrovic, Devercelli, & Forastier, ). Clearly, many factors may control the development of phytoplankton in rivers, and there is no clear consensus as to which factors regulate river phytoplankton communities (Tavernini et al, ; Wu et al, ).…”

Section: Introductionmentioning

confidence: 99%

Abiotic factors controlling the seasonal and spatial patterns of phytoplankton community in the Tigris River, Turkey

Varol

Şen

2017

River Research & Apps

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In this study, the seasonal and spatial dynamics of the phytoplankton community in the Tigris River (Turkey) and the relationships with environmental factors were analysed. Bacillariophyta were the most important taxonomic group both in terms of abundance and species number.Phytoplankton abundance increased from winter to autumn associated with a decline in discharge and an increase in nutrient concentrations and water temperature. There was a downstream increase in phytoplankton abundance and species number in the river. Similar spatial and seasonal patterns were observed in chlorophyll-a concentration and phytoplankton abundance. Redundancy analysis and correlation analysis revealed that chemical variables, mainly nutrients were the most important abiotic factors controlling phytoplankton abundance in the Tigris River.

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Section: Introductionmentioning

confidence: 99%

Abiotic factors controlling the seasonal and spatial patterns of phytoplankton community in the Tigris River, Turkey

Varol

Şen

2017

River Research & Apps

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“…While it has been stated that 'tropical rivers are poorly understood compared with their temperate counterparts' (Davies, Bunn & Hamilton, 2008), the studies conducted in the tropical and subtropical regions suggest that phytoplankton dynamics in tropical rivers obey the same rules as in temperate rivers given above, even though specific features of tropical rivers further constrain development of algal populations within the river channel. The best studied tropical rivers are South American rivers such as the Amazon (Fisher & Parsley, 1979;Wissmar et al, 1981;Forsberg et al, 1993), but also the Uruguay (O'Farrell & Izaguirre, 2014), Paran a (Bonetto, 1983;Garcia de Emiliani, 1990) and Paraguay (Zalocar De Domitrovic, 2002;Zalocar de Domitrovic, Devercelli & Garcia de Emiliani, 2007;Devercelli et al, 2014). The emerging general view is that, in lowland high-order rivers, phytoplankton production in river channels is 'exceedingly low' (Lewis, Hamilton & Saunders, 1995) due to extreme light limitation, combined in black water rivers with low nutrient concentrations (Wissmar et al, 1981).…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton dynamics in the Congo River

et al. 2016

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Summary We report a dataset of phytoplankton in the Congo River, acquired along a 1700‐km stretch in the mainstem during high water (HW, December 2013) and falling water (FW, June 2014). Samples for phytoplankton analysis were collected in the main river, in tributaries and one lake, and various relevant environmental variables were measured. Phytoplankton biomass and composition were determined by high‐performance liquid chromatography analysis of chlorophyll a (Chl a) and marker pigments and by microscopy. Primary production measurements were made using the 13C incubation technique. In addition, data are also reported from a 19‐month regular sampling (bi‐monthly) at a fixed station in the mainstem of the upper Congo (at the city of Kisangani). Chl a concentrations differed between the two periods studied: in the mainstem, they varied between 0.07 and 1.77 μg L−1 in HW conditions and between 1.13 and 7.68 μg L−1 in FW conditions. The relative contribution to phytoplankton biomass from tributaries (mostly black waters) and from a few permanent lakes was low, and the main confluences resulted in phytoplankton dilution. Based on marker pigment concentration, green algae (both chlorophytes and streptophytes) dominated in the mainstem in HW, whereas diatoms dominated in FW; cryptophytes and cyanobacteria were more abundant but still relatively low in the FW period, both in the tributaries and in the main channel. Daily integrated production measured in the mainstem (n = 15) varied between 64.3 and 434.1 mg C m−2 day−1 in FW conditions and between 51.5 and 247.6 mg C m−2 day−1 in HW. Phytoplankton biomass in the Congo River mainstem was likely constrained by hydrological factors (accumulation due to increased retention time during FW, dilution by increased discharge during HW), even though increased nutrient availability in the FW period might have also stimulated phytoplankton production. In contrast to other tropical river systems where connectivity with the floodplain and the presence of natural lakes and man‐made reservoirs play a prominent role in the recruitment of phytoplankton to the main river, our results show that phytoplankton growth in the Congo River can take place in the main channel, with hydrological processes allowing maintenance of phytoplankton biomass even during HW.

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“…Despite flowing through the capital city of Formosa Province, Formosa River has deserved little attention to present. Yet, its location between the watersheds of Pilagá River to the north and San Hilario river to the south provides an interesting source for comparison, as these waterbodies show similar low conductivity values (less than 500 µS/ cm during low waters in rainy years) as compared to other autochtonous streams located in surrounding catchments and, like the Riacho Formosa, are not covered by aquatic macrophytes (Zalocar de Domitrovic et al 2014b). Among the environmental parameters studied, river depth, transparency and conductivity accurately reflected the hydrological cycles that drive the structure, abundance and composition of the phytoplankton, as described by Zalocar de Domitrovic et al (1986, 2014b for other local watercourses in this region.…”

Section: Discussionmentioning

confidence: 99%

“…Yet, its location between the watersheds of Pilagá River to the north and San Hilario river to the south provides an interesting source for comparison, as these waterbodies show similar low conductivity values (less than 500 µS/ cm during low waters in rainy years) as compared to other autochtonous streams located in surrounding catchments and, like the Riacho Formosa, are not covered by aquatic macrophytes (Zalocar de Domitrovic et al 2014b). Among the environmental parameters studied, river depth, transparency and conductivity accurately reflected the hydrological cycles that drive the structure, abundance and composition of the phytoplankton, as described by Zalocar de Domitrovic et al (1986, 2014b for other local watercourses in this region. In general, the high water period gives rise to a higher species richness, as the fluvial overflow allows contact with lenitic waterbodies and other streams, thus favouring the exchange of propagules with different survival strategies, as proposed by Zalocar de Domitrovic et al(2014b).…”

Section: Discussionmentioning

confidence: 99%

“…Among the limnological regions of Argentina defined by Tell et al (2014), the Chaco-Pampa Plain is the most extense, and its northern area overlaps with the Warm climatic region, which reputedly hosts the richest phycoflora and accounts for a large number of probably endemic species (Tell, 2014). Within this area, the ecology of the phytoplankton inhabiting Paraná and Paraguay rivers and their floodplains has deserved much attention over the past 30 years, as comprehensively summarized by Devercelli et al (2014) and Zalocar de Domitrovic et al (2014a), while small local tributaries have been less studied, mostly through single point samplings (Zalocar de Domitrovic et al, 2014b). The phycological overall diversity of the area, in turn, was surveyed over many floristic papers, as detailed in Zalocar de Domitrovic & Forastier (2008).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrology-driven seasonal changes in the phytoplankton of a subtropical river (Riacho Formosa, Argentina).

Mataloni¹,

Burdman²,

Casa³

et al. 2018

Bol. Soc. Argent. Bot.

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The Riacho Formosa is one of many autochtonous watercourses running along the subtropical region of the Wet Chaco Plains and draining into Paraguay River. Their typical hydrological cycle is characterized by a late winter low phase and a high phase throughout the warm season. As part of a baseline characterization, the composition and structure of the phytoplankton were studied in relation to river depth, water temperature, pH, conductivity and transparency through 4 seasonal samplings between June 2015 and March 2016. A rich phytoplankton community (338 taxa) was revealed in this study. A few species of Cryptophyceae and Euglenophyceae dominated the community, especially during low waters. A cluster analysis showed that community compositions were more dissimilar over time than along the watercourse, and were spatially more homogeneous during high waters. A canonical correspondence analysis showed that environmental features significantly explained 42.6% of the total variance of species data (p= 0.004). We conclude that phytoplankton responds to hydrological changes through a high species turnover, with dominance peaks of euryhaline, shadow adapted and organic matter exploiting taxa during low waters.

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Phytoplankton of the Paraguay and Bermejo rivers

Cited by 11 publications

References 27 publications

Abiotic factors controlling the seasonal and spatial patterns of phytoplankton community in the Tigris River, Turkey

Abiotic factors controlling the seasonal and spatial patterns of phytoplankton community in the Tigris River, Turkey

Phytoplankton dynamics in the Congo River

Hydrology-driven seasonal changes in the phytoplankton of a subtropical river (Riacho Formosa, Argentina).

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