Phytoplankton and zooplankton (Cladocera, Copepoda) relationship in the eutrophicated River Danube (Danubialia Hungarica, CXI)

Bothár, Anna; Kiss, Keve Tihamér

doi:10.1007/978-94-009-0467-5_19

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…Maximum values of Chl a in the two stations (\7 lg l -1 ) were around one order of magnitude lower than maxima recorded in other European rivers, e.g., Danube, Thames, Elbe and Meuse (150-285 lg l -1 ; Bothár & Kiss, 1990;Ruse & Hutchings, 1996;Desortová et al, 1996;Gosselain et al, 1998;Young et al, 1999). This aspect was underscored in previous research, when in three stations along a 26-km stretch of the lowland course of the River Adige, Salmaso and Braioni (2008) recorded maximum concentrations of Chl a ranging from 23 to 31 lg l -1 .…”

Section: Constraints To Phytoplankton Developmentmentioning

confidence: 70%

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

Salmaso

Zignin

2009

Hydrobiologia

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Phytoplankton and associated environmental factors were collected fortnightly during a 1-year cycle in the upper and lower reaches of the River Adige (northeastern Italy). The river has a typical Alpine flow, with the period of high flow and flooding occurring in the spring and summer months. Phytoplankton biomass was constrained by physical variables, mainly water discharge and associated variables directly linked to water fluxes. These factors acted negatively and synchronously by diluting phytoplankton cells and worsening the light regime. Nutrient concentrations did not appear to limit phytoplankton growth. Compared to many other central European rivers, the very low maximum algal biomasses supported by River Adige (Chl a \ 7 lg l -1 ) are due to the Alpine flow regime, which is characterised by higher flow during the warmer months, when conditions for algal development are more favourable. Hydrology and flow regime, along with the channelisation of the river, caused development of a simplified phytoplankton community, which was almost exclusively composed of diatoms. Moreover, these factors contributed significantly to the lack of ordered and cyclic temporal patterns in phytoplankton dynamics. In fact, the gradient of species composition showed a strong association with hydrological factors. If the scenarios predicting increase of atmospheric temperatures and decrease of atmospheric precipitations and water availability in the regions south of the Alps are realistic, algal biomasses may rise and be associated with an increase of groups other than diatoms.

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Section: Constraints To Phytoplankton Developmentmentioning

confidence: 70%

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

Salmaso

Zignin

2009

Hydrobiologia

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“…Changes in species composition of planktonic crustaceans in the Hungarian River Danube, over a period of 20 years, indicated its gradual eutrophication (Bothar and Kiss, 1990). This was confirmed by the striking alteration recorded by Gulyas (1994) in species composition, including rotifers, over 5 years.…”

Section: Discussionmentioning

confidence: 83%

“…In the past, Talling and Rzoska (1967) provided examples of plankton development under conditions of running water without extensive storage in reservoirs, but they suspected that smaller obstructions to flow, as in swamps, cataracts and barrages may have had an effect. Using zooplankton density-biomass and daily transport, several authors concluded that some species reproduce in the main channel at low water (Rzoska, 1968;Vasquez and Rey, 1989;Bothar and Kiss, 1990;Holst et al, 2002), but such processes have rarely been adequately addressed because of the difficulties of making in situ measurements. In addition, the role of riverine animal plankton in the foodweb needs to be debated.…”

Section: A Challenge For Potamoplankton: Eat To Be Fruitful and Multiplymentioning

confidence: 98%

A review of regulation mechanisms of metazoan plankton in riverine ecosystems: aquatic habitat versus biota

2006

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This review summarizes the key factors of a series of articles about animal plankton in rivers, a topic that remains poorly investigated. Running water, in which sampling processes are variable and often difficult, acts as a constraint as well as a resource for plankton. Assessment of the potamoplankton reveals that good swimmers of the true plankton are mixed with numerous poor swimmers among littoral and epibenthic forms. Small taxa dominate communities in most of rivers all over the world and, in comparison with crustaceans; the successful development of rotifers rests on their shorter development times. According to hydraulic and geomorphological features, the diversity of the habitats and the ability of individuals to avoid washout was examined, decrease in flow creating standing zones favourable to zooplankton development. Many species can find suitable conditions for the development of dense populations in stream habitats and examples of taxa-specific response, regardless of the habitat structure, are observed. While the challenge for riverine plankton remains 'eat to be fruitful and multiply', their activities have been poorly investigated in turbulent conditions, those able to continue growing in a current of 20 cm s À1, such as brachionid species, being usually dominant in rivers. Examination of the distribution of plankton populations, in the Middle Loire and in other rivers, showed that the flow regime, which plays a central role in organizing river habitats, explains the presence/absence of these fast-growing organisms. While reservoirs are major sources of crustaceans, lateral exchanges as well as downstream transport are important in determining the plankton. These ecosystems are primarily governed by abiotic factors, biological control taking place after physical control has happened. Because animals arrive by chance in any habitat during dispersion, zooplankton in rivers remains primarily governed by unpredictable physical processes and depends on the age of the water and the availability of habitats. In this way, the hydro-dynamics of river habitats need to be more documented with regard to their key role in the planktonic life. Preservation of the lentic areas remaining at the heart of the matter, the contrasting ecology of the rotifers should be a reliable tool with which to estimate the changes in habitats diversity of main channels, particularly during droughts, while crustacean's diversity would be more representative of flood plain annexes, particularly during flood events.

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“…Composition of the plankton is strongly influenced by competition among the plankton members, and this leads to the development of a characteristic assemblage called potamoplankton. The potamoplankton is mostly dominated by centric diatoms and chlorococcaleans not only in the vegetation period (Bothár and Kiss, 1990;Várbíró et al, 2007), but in winters too (Kiss and Genkal, 1993). This assemblage can also be enriched by the influents, but this impact is of lesser importance, because of the very large water discharge of the rivers in this category.…”

Section: Discussionmentioning

confidence: 99%

The role of phytoplankton diversity metrics in shallow lake and river quality assessment

Borics

Görgényi

Grigorszky

et al. 2014

Ecological Indicators

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Ecological water quality problems are frequently connected to increment of phytoplankton productivity and overdominance of some phytoplankton species. Metrics that show monotonously increasing or decreasing tendencies along stressor gradients is recommended for ecological state assessment. Diversity metrics are influenced by various physical disturbances and show high within-year variability; thus, there is no agreement on the usefulness of these metrics as state indicators.To test the usefulness of phytoplankton diversity in ecological state assessment we investigated the productivity-diversity relationships for lakes and rivers in the Carpathian Basin (Hungary). We demonstrated that the shape of productivity-diversity relationship depends on the investigated water body type. Regarding lakes, hump-shaped relationship was found for all computed metrics. Parallel with the increase in phytoplankton productivity values, diversity metrics showed monotonously increasing tendencies in rhithral and decreasing tendencies in large potamal rivers. We found no systematic relationship in the case of small lowland rivers. Changes of diversity metrics calculated for species and functional groups showed similar tendencies within the types, only the slopes of regression lines differ each other. The use of diversity metrics as ecological state indicators should be restricted to water body types where diversity decreases or increases monotonously with phytoplankton biomass. Regarding the lakes the use of diversity metrics is not recommended for ecological state assessment. In rhithral and large potamal river assessment, application of diversity metrics should be strongly considered. We demonstrated that diversity metrics can be useful components of multimetric indices proposed to use by the Water Framework Directive.

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Phytoplankton and zooplankton (Cladocera, Copepoda) relationship in the eutrophicated River Danube (Danubialia Hungarica, CXI)

Cited by 5 publications

References 10 publications

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

A review of regulation mechanisms of metazoan plankton in riverine ecosystems: aquatic habitat versus biota

The role of phytoplankton diversity metrics in shallow lake and river quality assessment

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