Hydrology as a major factor determining plankton development in two floodplain segments and the River Danube, Austria

Hein, Thomas; Baranyi, Christian; Heiler, G.; Holarek, C.; Riedler, P.; Schiemer, F.

doi:10.1127/lr/11/1999/439

Cited by 32 publications

(48 citation statements)

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“…These results may indicate that phytoplankton growth was not strongly influenced by light and nutrients in the lake during the dry and mid-dry seasons, and in the tributaries. Other studies have found that hydrology, such as water retention time, determines phytoplankton development in rapidly flushed ecosystems (Hein et al, 1999;Søballe and Kimmel, 1987;Zeng et al, 2006). Therefore, we hypothesised that hydrological conditions, specifically the retention time, represented the principal factor controlling phytoplankton growth in both the lake during the dry and mid-dry seasons and the tributaries during all three seasons.…”

Section: P9mentioning

confidence: 91%

“…In combination, these factors justify the importance of phytoplankton for tracking environmental changes in view of management issues involving aquatic ecosystems. Numerous studies have addressed the factors that disrupt the growth of phytoplankton, including abiotic (droughts and floods) and biotic factors (human pollution and grazing), and these studies have also estimated how ecosystems respond to stressors (Hein et al, 1999;Riedler et al, 2006;Vanni and Temte, 1990). Hydrological conditions, such as the water level, are the primary factors that affect phytoplankton, particularly in hydrologically variable environments.…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton chlorophyllain Lake Poyang and its tributaries during dry, mid-dry and wet seasons: a 4-year study

Lai

Zhang

et al. 2014

Knowl. Managt. Aquatic Ecosyst.

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Key-words:Lake Poyang, tributaries, chlorophyll a, light, water retention timeVariations in phytoplankton chlorophyll a were studied in Lake Poyang, and these variations were compared with those observed in its tributaries. Samples were collected from January 2009 to January 2013 during the dry, mid-dry and wet seasons. The study showed that chlorophyll a concentrations were significantly higher in the wet season than in the dry and mid-dry seasons (p < 0.0001) in the lake; a comparative analysis of Lake Poyang and its tributaries showed significant differences in chlorophyll a between the two ecosystems during the wet season but not during the dry and mid-dry seasons. During the wet season, the underwater light conditions were significantly elevated and water retention time increased substantially (25.5 d). In combination, these factors contributed to a significantly higher chlorophyll a concentration during the wet season than that during the dry and mid-dry seasons in the lake; the effect of nutrients on the phytoplankton was not obvious. The large variations in water retention time during the three seasons indicated that Lake Poyang has the combined characteristics of a river and a lake. The short retention times during the dry and mid-dry seasons produced no difference in chlorophyll a between the lake and its tributaries, whereas the long retention time during the wet season facilitated phytoplankton growth in the lake. ces facteurs a contribué à une augmentation significative de la concentration en chlorophylle a pendant la saison des pluies ; l'effet des nutriments sur le phytoplancton n'était pas évident. Les grandes variations dans le temps de rétention de l'eau au cours des trois saisons impliquent que le lac Poyang combine les caractéristiques d'une rivière et d'un lac. Les temps de rétention courts pendant les saisons sèche et mi-sèche n'entraînent aucune différence en chlorophylle a entre le lac et ses affluents, tandis que le temps de rétention long pendant la saison des pluies facilite la croissance du phytoplancton dans le lac.

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Section: P9mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Phytoplankton chlorophyllain Lake Poyang and its tributaries during dry, mid-dry and wet seasons: a 4-year study

Lai

Zhang

et al. 2014

Knowl. Managt. Aquatic Ecosyst.

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“…Particulate organic nitrogen showed no relation to hydrology, nor did Chla. Algal blooms in floodplain pools have been shown to depend on nutrient supply by floods and on grazing pressure (13,15).…”

Section: Discussionmentioning

confidence: 99%

“…This backwater system was artificially cut off from the riverine channel network at its upstream end Ͼ100 years ago but still remained to some extent dynamically interlinked with the main channel. In 1997, a restoration project took place at this site, which led to an additional increase in surface connectivity with the river (connection 0.5 m below mean water) and consequently to lotic conditions in this floodplain area for Ͼ180 days of a hydrological average year (13,30). The other three floodplain pool sampling sites, L3, L4, and L5, were located in a former river channel in the Lobau area within the district of Vienna.…”

Section: Methodsmentioning

confidence: 99%

Complexity of Bacterial Communities in a River-Floodplain System (Danube, Austria)

Besemer

Moeseneder

Arrieta

et al. 2005

Appl Environ Microbiol

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Natural floodplains play an essential role in the processing and decomposition of organic matter and in the self-purification ability of rivers, largely due to the activity of bacteria. Knowledge about the composition of bacterial communities and its impact on organic-matter cycling is crucial for the understanding of ecological processes in river-floodplain systems. Particle-associated and free-living bacterial assemblages from the Danube River and various floodplain pools with different hydrological characteristics were investigated using terminal restriction fragment length polymorphism analysis. The particle-associated bacterial community exhibited a higher number of operational taxonomic units (OTUs) and was more heterogeneous in time and space than the free-living community. The temporal dynamics of the community structure were generally higher in isolated floodplain pools. The community structures of the river and the various floodplain pools, as well as those of the particle-associated and free-living bacteria, differed significantly. The compositional dynamics of the planktonic bacterial communities were related to changes in the algal biomass, temperature, and concentrations of organic and inorganic nutrients. The OTU richness of the free-living community was correlated with the concentration and origin of organic matter and the concentration of inorganic nutrients, while no correlation with the OTU richness of the particle-associated assemblage was found. Our results demonstrate the importance of the river-floodplain interactions and the influence of damming and regulation on the bacterial-community composition.Almost all large rivers in Europe are greatly affected by pollution, alterations in the catchment, and hydraulic engineering (30). The greatest impact of damming and regulation on the connectivity, thermal heterogeneity, and biodiversity of a river system becomes visible in the lowland region of a river. Side arms, dead side arms, separated meander segments, and expansive floodplains, as they naturally appear in the lowland reach of a river, create a broad range of lotic, lentic, and semiaquatic habitats, leading to hot spots of biodiversity (37). Natural floodplains serve as sinks, sources, or transformers of dissolved and particulate organic matter, inorganic nutrients, and biota and thus contribute greatly to the self-purification ability of a river. The driving force of exchange processes between the river and its floodplains is hydrological connectivity, via both surface and groundwater inflow (36).The National Park of the River Danube (Austria) is one of the last remnants of a natural floodplain and one of the largest in Europe. It is located downstream of Vienna and extends to the Slovakian border. Due to regulation of the Danube River and the construction of hydropower dams upstream of Vienna, large parts of the floodplains have been drained or disconnected from the river, and the hydrology and limnology of the whole river-floodplain system has been changed. The freeflowing section of t...

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“…Introduction of the Flood Pulse Concept (JUNK et al, 1989) stimulated renewed interest in the connection between large rivers and their floodplains; since then numerous studies have focused on the zooplankton of large rivers. These efforts have indicated that inshore retention and hydrological connectivity are a major determinant of zooplankton assembly (HEIN et al, 1999;BARANYI et al, 2002;RECKENDORFER et al, 1999;ZIMMERMANN-TIMM et al, 2007). In contrast, most hydro-ecological research projects on large rivers and their floodplains focus just on fish and/or benthic invertebrate assemblages, thus neglecting the importance of zooplankton communities in the food-web of river-floodplain systems.…”

mentioning

confidence: 96%

Flood‐Pulse Effects on Zooplankton Assemblages in a River‐Floodplain System (Gemenc Floodplain of the Danube, Hungary)

Schöll

Kiss

Dinka

et al. 2012

International Review of Hydrobiology

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We studied the structure and population dynamics of zooplankton assemblages in the water bodies (eu-, para-, plesiopotamal and conjunctive water bodies) of a temperate floodplain during flood events. Here we report differences in the species composition of these water bodies in the two stages of flood pulses: rising vs. receding. During the receding period the proportion of larger and tychoplanktonic species increased. Similarity among zooplankton assemblages of these floodplain water bodies increased during the rising and decreased during the receding period. Species richness, diversity and population density values of zooplankton assemblages increased during the receding period in all types of water bodies except the eupotamal. The guild ratio of rotifer assemblages showed characteristic, but somewhat ambiguous changes. We conclude that the hydrological regime affects the structure and dynamics of zooplankton assemblages on the floodplain. IntroductionSpatial and temporal variability induces high productivity and biodiversity in terrestrial and aquatic components of the river-floodplain systems (SHIEL et al., 1998;ARMITAGE et al., 2003). Understanding the ecological functions of natural river-floodplain systems is important to establish criteria to protect the biota of these sites (BERCZIK and BUZETZKY, 2006). Introduction of the Flood Pulse Concept (JUNK et al., 1989) stimulated renewed interest in the connection between large rivers and their floodplains; since then numerous studies have focused on the zooplankton of large rivers. These efforts have indicated that inshore retention and hydrological connectivity are a major determinant of zooplankton assembly (HEIN et al., 1999;BARANYI et al., 2002;RECKENDORFER et al., 1999;ZIMMERMANN-TIMM et al., 2007). In contrast, most hydro-ecological research projects on large rivers and their floodplains focus just on fish and/or benthic invertebrate assemblages, thus neglecting the importance of zooplankton communities in the food-web of river-floodplain systems. Concomitantly an assessment of their suitability as a biomonitoring tool is also neglected (BORJA et al., 2008;RESH, 2008

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Hydrology as a major factor determining plankton development in two floodplain segments and the River Danube, Austria

Cited by 32 publications

References 0 publications

Phytoplankton chlorophyllain Lake Poyang and its tributaries during dry, mid-dry and wet seasons: a 4-year study

Phytoplankton chlorophyllain Lake Poyang and its tributaries during dry, mid-dry and wet seasons: a 4-year study

Complexity of Bacterial Communities in a River-Floodplain System (Danube, Austria)

Flood‐Pulse Effects on Zooplankton Assemblages in a River‐Floodplain System (Gemenc Floodplain of the Danube, Hungary)

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