Untitled

Lair, Nicole; Reyes-Marchant, Patricia

doi:10.1023/a:1003127230386

Cited by 50 publications

(8 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These organisms can break away from the substrata because of the river's discharge and strong current, thus being transported by the flow of water (Lair and Reyes-Marchant, 1997;Soares et al, 2007;Stevenson, 2009). Descy et al (2011) observed that over 70% of the species of diatom identified in the Loire River were benthic and not potamoplanktonic, like in the Lower Iguaçu.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variation of the phytoplankton community in a section of the Iguaçu River, Paraná, Brazil

Menezes¹,

Bueno²,

Rodrigues

2013

Braz. J. Biol.

View full text Add to dashboard Cite

The work aimed to show variations in the composition and structure of the phytoplankton community at high water and low water in Iguaçu Falls, Iguaçu River and to examine the influence of these waterfalls and environmental variables on the community. Phytoplankton samples were taken monthly during a year from two sampling stations in the Iguaçu River. A total of 408 taxa were identified, with Bacillariophyceae being the most strongly represented group. A large differentiation in the composition of the phytoplankton was observed between the sampling stations. The total richness and density of the phytoplankton groups was very low in both sample locations, as well as the Shannon diversity index, but the evenness value was generally high. No significant seasonal and spatial difference in the studied features of the phytoplankton community was seen. But, significant seasonal differences were observed when the density and richness of the algae classes were assessed separately. The heterogeneity of the Iguaçu River's characteristics between the sampling sites caused no significant spatial differentiation in the features of the phytoplankton community. However, the seasonal variation of the climatic conditions has significantly influenced the composition and structure of the community in the Iguaçu River.Keywords: lotic ecosystem, potamoplankton, Iguaçu River.Variação espacial e temporal da comunidade fitoplanctônica em um trecho do Rio Iguaçu, Paraná, Brasil ResumoEste trabalho objetivou apresentar a variação da composição e da estrutura da comunidade fitoplanctônica a montante e a jusante das Cataratas do Iguaçu, Rio Iguaçu, Paraná, e verificar a influência destas quedas d'água e das variáveis ambientais sobre esta comunidade. As coletas do material fitoplanctônico foram realizadas mensalmente, durante um ano, em duas estações de amostragem no Rio Iguaçu. Um total de 408 táxons foi identificado, sendo Bacillariophyceae o grupo melhor representado. Uma marcante diferenciação na composição do fitoplâncton entre as estações amostradas foi observada. A riqueza total e a densidade dos grupos fitoplanctônicos foram muito baixas em ambos os locais de coleta, assim como a diversidade de Shannon; contudo, a equitabilidade, de uma maneira geral, foi alta. Não foi observada diferença sazonal e espacial significativa para os atributos da comunidade fitoplanctônica. Entretanto, diferenças sazonais significativas foram observadas quando avaliadas as densidades e riquezas das classes de algas, separadamente. A heterogeneidade das características do Rio Iguaçu entre os locais amostrados não causaram uma diferenciação espacial significativa nos atributos da comunidade fitoplanctônica. Entretanto, a variação sazonal das condições climáticas influenciou significativamente a composição e a estrutura da comunidade no Rio Iguaçu.Palavras-chave: ecossistema lótico, potamoplâncton, Rio Iguaçu.

show abstract

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variation of the phytoplankton community in a section of the Iguaçu River, Paraná, Brazil

Menezes¹,

Bueno²,

Rodrigues

2013

Braz. J. Biol.

View full text Add to dashboard Cite

show abstract

“…Nutrients can potentially limit phytoplankton growth in spring and summer, but they are usually present in non-limiting concentrations in rivers affected by urban and agricultural land use including our focus rivers Rhine and Elbe (Ietswaart et al, 1999;Quiel et al, 2011). Apart from physical and chemical factors, biotic factors can massively interfere with phytoplankton populations and community structure, exerting a top-down effect (Gosselain et al, 1994;Lair and Reyes-Marchant, 1997;Welker and Walz, 1998).…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Plankton Dynamics in the Rivers Rhine and Elbe

et al. 2015

View full text Add to dashboard Cite

We compared the longitudinal plankton development in the two large rivers Rhine and Elbe by means of four Lagrangian sampling campaigns performed within the time span 2009-2011. The campaigns revealed low chlorophyll concentrations in the Rhine along a long river stretch (Rhine-km 170 to 854) with maximum values below 5 μg L À1 in 2010. In contrast, the Elbe (Elbe-km 4 to 582) showed high and longitudinally increasing chlorophyll concentrations with maximal values of 174 μg L À1 in 2009 and 123 μg L À1 in 2011. Additional samples of the benthic bivalves along the river stretches revealed high densities of the filter feeders in the Rhine that could potentially explain losses of plankton production. Their densities in the Elbe were significantly lower, making important losses to benthic filter feeders unlikely. However, strong phytoplankton growth was observed during the sampling campaign in 2011 in the Rhine coinciding with a low discharge event. This resulted in an exceptionally high chlorophyll value of up to 244 μg L À1 in the lower river sections, a value that was not reached in the last two decades of continuous water quality monitoring in the Rhine. Even though we cannot fully explain this phenomenon, it shows that phytoplankton has a high growth potential in the Rhine but is usually controlled by other mechanisms. Tributaries represented an additional and important source of plankton biomass and suspended substances in the Rhine, whereas they primarily diluted the plankton concentrations in the Elbe.

show abstract

“…Similar domination of rotifers was observed in several rivers including the Elbe (Zimmermann-Timm et al 2007), the Danube (Reckendorfer et al 1999), the Loire (Lair & Reyes-Marchant 1997), the Rhine (Friedrich & Pohlmann 2009), the Po (Rossetti et al 2009) and the Darling (Shiel 1985). It has been suggested that the apparent dominance of rotifers in rivers maybe due to their relatively short generation times compared to the larger crustacean zooplankton (van Dijk & van Zanten 1995;Lair 2006).…”

Section: Discussionmentioning

confidence: 57%

“…Recent attempts to examine specific adaptation of rotifers have shown that among several planktonic forms, the loricate species appeared to be better adapted to the river current than soft bodies or littoral epibenthic species (Lair 2005). Planktonic loricate species dominated not only in the lower Vistula River but also in the middle Loire (Lair & Reyes-Marchant 1997), the Thames (May & Bass 1998) and the lower Rhine (Fredrich & Pohlmann 2009). Dominance of them in numerous rivers may be explained by the capacity of several species to continue growing in currents in excess of 0.2 m s −1 (Lair 2005).…”

Section: Discussionmentioning

confidence: 99%

“…While zooplankton composition and abundance have been quite well documented in many large rivers of Europe (Lair & Reyes-Marchant 1997;Reckendorfer et al 1999;Zimmermann-Timm et al 2007;Rossetti et al 2009;Vadadi-Fülöp et al 2009 little is known of these communities in the mid-eastern European rivers such as the Vistula River. The Vistula River is one of the largest rivers of the Baltic Sea basin and its valley is an important ecological corridor in this part of Europe (Bij de Vaate et al 2002).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The diversity and longitudinal changes of zooplankton in the lower course of a large, regulated European river (the lower Vistula River, Poland)

Napiórkowski

Napiórkowska

2013

Biologia

View full text Add to dashboard Cite

The diversity and longitudinal variation of zooplankton in the lower Vistula River were analyzed. Samples were taken from 40 stations located along a 272-km long section of the lower river course. During the study the unique technique of taking samples from "the same water" was used. The zooplankton community was dominated by rotifers and naupliilarval stages of copepods. The most abundant species were: Brachionus angularis, Brachionus calyciflorus and Brachionus budapestiensis. The zooplankton species diversity in the main channel of the lower Vistula River was similar to other large European rivers; however, its abundance was lower. The diversity, abundance and biomass of potamoplankton steadily decreased downstream. This could be related both to scarcity of storage zones for potamoplankton development in the river due to the extensive regulation processes, and changes in hydrological conditions of the main channel (by the straightening of riverbed) where the samples were collected.

show abstract

Untitled

Cited by 50 publications

References 63 publications

Spatial and temporal variation of the phytoplankton community in a section of the Iguaçu River, Paraná, Brazil

Spatial and temporal variation of the phytoplankton community in a section of the Iguaçu River, Paraná, Brazil

Longitudinal Plankton Dynamics in the Rivers Rhine and Elbe

The diversity and longitudinal changes of zooplankton in the lower course of a large, regulated European river (the lower Vistula River, Poland)

Contact Info

Product

Resources

About