Factors controlling the seasonal development and distribution of the phytoplankton community in the lowland course of a large river in Northern Italy (River Adige)

Salmaso, Nico; Braioni, Maria Giovanna

doi:10.1007/s10452-007-9135-x

Cited by 66 publications

(48 citation statements)

References 52 publications

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“…The two seasonal patterns and the corresponding dominant algal groups encountered were reported previously in other lotic waterbodies and regions in the suspended algal fraction (type I: Garnier et al 1995;Salmaso & Braioni 2008;type II: Stevenson & White 1995;Karrasch et al 2001). No other studies on suspended algae in small lotic ecosystem investigating this issue were conducted but as the results suggest, findings from larger lotic ecosystems may be transferred to smaller lotic waterbodies.…”

Section: Algal Abundance and Seasonalitysupporting

confidence: 49%

Seasonality of algal communities in small streams and ditches in temperate regions using delayed fluorescence

Breuer

Janz

Farrelly

et al. 2016

Journal of Freshwater Ecology

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Because of their high ecological relevance, algae are often used in environmental monitoring of freshwater ecosystems. They are used to assess the state of the environment, and can be used to estimate the diversity and productivity of the ecosystem. Chlorophyll a is the most commonly used indicator where no taxonomic information is obtained. In this two-year study, algae were monitored in small lotic waterbodies using a high precision method of evaluating algal pigments: delayed fluorescence (DF). The method allows quantifying algae and differentiating algal groups using pigments unique to each algal group. DF correlated strongly with biovolume (derived from cell count) data (r 2 D 0.94) and could therefore be recommended as a biomonitoring tool. In addition, seasonal dynamics in both the attached and suspended algal communities were studied. Both algal fractions displayed seasonal variations with either a single peak in biomass in summer (type 1), or with two peaks in biomass in spring and fall (type 2). Green algae dominated type 1 patterned communities whereas diatoms dominated type 2 patterned communities. Spatial synchronicity between sampling sites and waterbodies was observed within the studied watershed. Sampling time rather than spatial site selection was found to be a key factor in the study of algal communities in lotic bodies of water.

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Section: Algal Abundance and Seasonalitysupporting

confidence: 49%

Seasonality of algal communities in small streams and ditches in temperate regions using delayed fluorescence

Breuer

Janz

Farrelly

et al. 2016

Journal of Freshwater Ecology

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“…In flushed systems, the phytoplankton structure is determined by physical factors like retention time of water (Köhler and Hong 2000, Everbecq et al 2001, Sabater et al 2008, light condition (Everbecq et al 2001, Reynolds 2003, tributaries (Skidmore et al 1998, Karrasch et al 2001, flow velocity (Skidmore et al 1998, Bahnwart et al 1999, Salmaso et al 2008 and changing nutrient supply (Köhler andHong 2000, Sabater et al 2008).…”

Section: Introductionmentioning

confidence: 99%

The effect of cyanobacterial blooms in the Siemianówka Dam Reservoir on the phytoplankton structure in the Narew River

Grabowska

Mazur‐Marzec

2011

Oceanological and Hydrobiological Studies

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The effect of cyanobacterial blooms on the phytoplankton structure in the lowland Narew River (north-eastern Poland) was examined. The studies were carried out at stations situated at different distances from the eutrophic Siemianówka Dam Reservoir. In 2008, the investigated lowland reservoir and the outflowing river were characterized by the dominance of toxic cyanobacteria (from July to October). At a station situated 130 km below the dam, species composition in the river was very similar to that in the shallow reservoir. Planktothrix agardhii was the main and permanent dominant, both in limnoplankton and potamoplankton. The current study indicates that the eutrophic Siemianówka Dam Reservoir is the main and rich source of phytoplankton for the outflowing Narew River. Cyanobacteria were dominant in the river phytoplankton at all sampling stations, but their share in phytoplankton biomass gradually decreased with the distance from the dam. Chemical analysis revealed the presence of microcystins (MCs) in water samples collected from June to October. The toxins, mainly demethylated MC analogues, were detected at a long distance down the river,

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“…Corresponding values for nutrient thresholds are based on half-saturation coefficients for N (DIN = 15-300 lg L -1 ) and P (PO 4 = \5-25 lg L -1 ) uptake (Hamilton and Schladow 1997). Nutrient thresholds are low in comparison to typical concentrations for rivers in human-dominated catchments suggesting a prevalence of light-limiting conditions (Reynolds and Descy 1996;Salmaso and Braioni 2008).…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton abundance and contributions to suspended particulate matter in the Ohio, Upper Mississippi and Missouri Rivers

et al. 2011

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Main channel habitats of the Ohio, Missouri, and Upper Mississippi Rivers were surveyed during the summers of 2004, 2005 and 2006 using a probability-based sampling design to characterize inter-annual and inter-river variation in suspended chlorophyll a (CHLa) and related variables. Large (fivefold) differences in CHLa were observed with highest concentrations in the Upper Mississippi (32.3 ± 1.8 lg L -1 ), intermediate values in the Missouri (19.7 ± 1.1 lg L -1 ) and lowest concentrations in the Ohio (6.8 ± 0.5 lg L -1 ). Inter-annual variation was small in comparison to inter-river differences suggesting that basin-specific factors exert greater control over river-wide CHLa than regional-scale processes influencing climate and discharge. The rivers were characterized by variable but generally low light conditions as indicated by depth-averaged underwater irradiance \4 E m -2 day -1 and high ratios of channel depth to euphotic depth ([3). Despite poor light conditions, regression analyses revealed that TP was the best single predictor of CHLa (R 2 = 0.40), though models incorporating both light and TP performed better (R 2 = 0.60). Light and nutrient conditions varied widely within rivers and were inversely related, suggesting that riverine phytoplankton may experience shifts in resource limitation during transport. Inferred grazing and sedimentation losses were large yet CHLa concentrations did not decline downriver indicating that growth and loss processes were closely coupled. The contribution by algae to suspended particulate organic matter in these rivers (mean = 41%) was similar to that of lakes (39%) but lower relative to reservoirs (61%).

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Factors controlling the seasonal development and distribution of the phytoplankton community in the lowland course of a large river in Northern Italy (River Adige)

Cited by 66 publications

References 52 publications

Seasonality of algal communities in small streams and ditches in temperate regions using delayed fluorescence

Seasonality of algal communities in small streams and ditches in temperate regions using delayed fluorescence

The effect of cyanobacterial blooms in the Siemianówka Dam Reservoir on the phytoplankton structure in the Narew River

Phytoplankton abundance and contributions to suspended particulate matter in the Ohio, Upper Mississippi and Missouri Rivers

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