Winter blooms of centric diatoms in the River Danube and in its side-arms near Budapest (Hungary)

Kiss, Keve Tihamér; Генкал, С. И.

doi:10.1007/bf00028030

Cited by 34 publications

(18 citation statements)

References 10 publications

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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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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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“…Furthermore, Mitrovic et al [41] found that Cyclotella biomass was negatively related to flow rates in the rivers. There are several studies indicating that a decreasing flow rate directly contributes to the spring diatom biomass [20,30,35,70]. Thus, the mechanisms behind diatom dominance in lentic and lotic water might not be identical because hydrodynamic conditions may differ between these types of systems.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Can Hydrodynamics Change Phosphorus Strategies of Diatoms?—Nutrient Levels and Diatom Blooms in Lotic and Lentic Ecosystems

2011

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Diatom blooms occur in many water bodies worldwide, causing significant ecological and social concerns. In order to understand the mechanisms of diatom blooms formation, the effects of varying phosphorus (P) concentration and hydrodynamics on the growth of diatoms were studied by combining results from field observations and laboratory experiments. The field investigation showed that spring diatom blooms (Cyclotella meneghiniana and Stephanodiscus hantzschii) occurred in Lake Taihu and Hanjiang River with similar environmental factors such as water temperature, pH, and dissolved oxygen in 2008. Concentrations of total phosphorus (TP), total nitrogen, and ammonia nitrogen (NH 4 -N) in Lake Taihu were significantly higher than the concentrations in the Hanjiang River. Laboratory experiments were conducted to evaluate growth and physiological responses of four lotic diatoms (Cyclotella atomus, Fragilaria crotonensis, Nitzschia palea, and S. hantzschii, isolated from the Hanjiang River) and three lentic diatoms (C. meneghiniana, Melosira varians, and Stephanodiscus minutulus, isolated from Lake Taihu, Lake Donghu, and Guanqiao Pond, respectively) to various P concentrations under smallscale turbulent and standing conditions. Our results showed that, with turbulence, lotic diatoms C. atomus, F. crotonensis, N. palea, and S. hantzschii demonstrated a significant increase in affinity for P compared with lentic diatoms C. meneghiniana, M. varians, and S. minutulus. Moreover, lotic diatoms C. atomus, F. crotonensis, and N. palea had higher growth rates and photosynthetic efficiencies with small-scale turbulence than with standing conditions both in P-limited and P-replete conditions. Lotic species S. hantzschii and three lentic diatoms (C. meneghiniana, M. varians, and S. minutulus) grew well under standing conditions. Our results may explain our field observation that the occurrence of diatom blooms in lakes is often associated with higher TP concentrations whereas in rivers, diatom blooms occur at a wide range of TP concentrations under flows. Therefore, different hydrodynamics and nutrient concentrations determined the dominant diatom species, according to their habitat-dependent physiological characteristics.

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“…Hence, the understanding and prediction the origin of phytoplankton blooms is of major importance, in this way we may get a picture of the possible outcomes of climate change and other environmental changes (Peeters et al 2007). It has been shown in the side arms and dead arms of the River Danube that phytoplankton of high abundance can evolve in winter during ice cover dominated by species of cold-tolerant Centrales, Cryptophyta and Volvocales (Kiss & Genkal 1993).…”

Section: Observed and Expected Reactions Of Aquatic Communitiesmentioning

confidence: 99%

Trends in Research on the Possible Effects of Climate Change Concerning Aquatic Ecosystems With Special Emphasis on the Modelling Approach

et al. 2009

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Abstract. Knowledge on the expected effects of climate change on aquatic ecosystems is defined by three ways. On the one hand, long-term observation in the field serves as a basis for the possible changes; on the other hand, the experimental approach may bring valuable pieces of information to the research field. The expected effects of climate change cannot be studied by empirical approach; rather mathematical models are useful tools for this purpose. Within this study, the main findings of field observations and their implications for future were summarized; moreover, the modelling approaches were discussed in a more detailed way. Some models try to describe the variation of physical parameters in a given aquatic habitat, thus our knowledge on their biota is confined to the findings based on our present observations. Others are destined for answering special issues related to the given water body. Complex ecosystem models are the keys of our better understanding of the possible effects of climate change. Basically, these models were not created for testing the influence of global warming, rather focused on the description of a complex system (e. g. a lake) involving environmental variables, nutrients. However, such models are capable of studying climatic changes as well by taking into consideration a large set of environmental variables. Mostly, the outputs are consistent with the assumptions based on the findings in the field. Since synthetized models are rather difficult to handle and require quite large series of data, the authors proposed a more simple modelling approach, which is capable of examining the effects of global warming. This approach includes weather dependent simulation modelling of the seasonal dynamics of aquatic organisms within a simplified framework.

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Winter blooms of centric diatoms in the River Danube and in its side-arms near Budapest (Hungary)

Cited by 34 publications

References 10 publications

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

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

Can Hydrodynamics Change Phosphorus Strategies of Diatoms?—Nutrient Levels and Diatom Blooms in Lotic and Lentic Ecosystems

Trends in Research on the Possible Effects of Climate Change Concerning Aquatic Ecosystems With Special Emphasis on the Modelling Approach

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