Phytoplankton and water chemistry of several alluvial pools and oxbows after the flood event - a process of diversification

Pithart, David

doi:10.1127/algol_stud/95/1999/93

Cited by 9 publications

(8 citation statements)

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“…With decreasing discharge and water levels, and even before the surface separation of water subsystems, a horizontal heterogeneity of water chemistry and plankton already appears, being accelerated by the subsequent surface separation of water bodies. Thus, the different spatial and temporal course of each flood causes a time shift in water chemistry and plankton development in different parts of the floodplain (Pithart, 1999). The morphometry of any water body has a crucial impact on the mixing of the water column.…”

Section: Source Of Water: Infiltration and Floodingmentioning

confidence: 99%

“…Moreover, flood events enhance the connectivity, accelerating the exchange of plankton communities, plant seeds and fish among the various pools and oxbows. After each flood event, a process of diversification begins again as the water level declines, the water current diminishes, and finally the floodplain lakes and oxbows become disconnected (Pithart, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal diversity of small shallow waters in river Lužnice floodplain

et al. 2007

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To propose a concept of their mutual diversity, twenty-nine permanent shallow floodplain pools and oxbows in the river Lužnice floodplain were analysed for area, depth, shape, flooding, and shading by terrestrial vegetation, and sampled in all seasons for their water chemistry, phytoplankton composition and biomass, and zooplankton composition. The sites are regularly flooded, eutrophic, and often shaded by surrounding vegetation. Cryptophyceae, Chrysophyceae and Euglenophyceae dominated the phytoplankton, while Cyanophytes were rare. Within the rich zooplankton assemblage (63 species), cladocerans and rotifers dominated. Correlation matrices and multivariate analyses indicated that shaded and relatively deeper sites had lower oxygen saturation and higher concentrations of PO 4 -P and NH 4 -N. Shade and relative depth correlated negatively with phytoplankton biomass and number of phytoplankton taxa, and positively with Cryptophytes and large cladocerans-thus indicating poor mixing, poor light availability and low fish pressure on herbivores. Decomposition of leaf litter increased oxygen consumption, while shade from terrestrial vegetation restricted photosynthesis and decreased oxygen production. Larger sites were more species-rich in phytoplankton and supported Euglenophyceae, green algae and rotifers.

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Section: Source Of Water: Infiltration and Floodingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial and temporal diversity of small shallow waters in river Lužnice floodplain

et al. 2007

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“…Shallow water depth and the presence of macrophytes allow for extensive development, at least seasonally, of metaphyton (large fi lamentous or thallose algae, epipelic and periphytic algae) besides plankton. Recent studies have shown that the algal community in wetlands may be signifi cantly different from that in the adjacent deep water in lakes or river channels (Moss and Balls 1989;van den Brink et al 1994;Pithart et al 1996;Pithart 1999). Robinson et al (1997a,b) report that in delta marshes, metaphyton contributes up to 70% of the total algal production and 87% (123-1300 g per square metre (m −2 )) of the biomass, and that this may be as high as the contribution from submerged macrophytes.…”

Section: Species Diversitymentioning

confidence: 99%

“…Sah and Gopal (unpublished) recorded much higher plant diversity in a part of the fl oodplain of the River Yamuna which did not experience direct fl ooding, than in another area regularly connected to the river channel. Studies of the Luznice River fl oodplain (Trebon Biosphere Reserve) (Pithart et al 1996;Pithart 1999) show habitat diversifi cation on the fl oodplain by different levels of shade caused by terrestrial vegetation, and the different basin morphology of waterbodies. Pithart (1999) shows that the diversifi cation of habitats increases in the fl oodplain with time.…”

Section: Hydrology Connectivity Ecotones and Disturbancementioning

confidence: 99%

Biodiversity in Wetlands

Gopal

2009

The Wetlands Handbook

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“…However, the presence of a dense and persistent cover of aquatic plants of large size (floating and submersed) counteracts turbulence (Scheffer 1998), and favours flagellated forms (Pithart 1999;Zalocar de Domitrovic 2000;O'Farrell et al 2003). Small C-strategists organisms can quickly develop under fairly high temperature and irradiance conditions after an event of resuspension even in spite of low nutrient concentrations (Jensen et al 1994).…”

Section: Phytoplankton Successionmentioning

confidence: 99%

Phytoplankton response to pH rise in a N-limited floodplain lake: relevance of N2-fixing heterocystous cyanobacteria

et al. 2009

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Phosphorus has been traditionally regarded as the controlling nutrient for phytoplankton growth, however, N-limitation is likely to occur in several environments. For example, nitrogen is considered the main nutrient limiting phytoplankton in floodplain lakes of the Paraná River basin. However, N 2 -fixing heterocystous cyanobacteria (N 2 -cyano) are usually absent in these water bodies. The low pH values frequently found may limit the development of these algae. We hypothesise that long-term lake isolation allows conspicuous phytoplankton growth during summer, resulting in high photosynthetic rates and pH. This scenario combined with low DIN (dissolved inorganic nitrogen) would favour the development of N 2 -cyano. Phytoplankton composition was studied during 16 months in a vegetated and isolated floodplain lake in the Paraná basin. Additionally, pH was artificially increased in in situ mesocosms to test effects on phytoplankton structure. Lake phytoplankton was dominated by flagellates (cryptophytes and euglenophytes) and small coccoid algae (chlorophytes and colonial cyanobacteria). Algal biomass was highest during warm periods. Although pH increased up to 8.8 during the second summer period, N 2 -cyano remained rare, most likely because of the high DIN concentration recorded. The alkalophilic diatom Cyclotella meneghiniana dominated and was positively correlated with pH. Conversely, PO 4 = concentrations in the mesocosm experiment were high and DIN remained relatively low. pH enhancement in the treated mesocosms (avg. pH = 8.2) promoted the development of N 2 -cyano (Anabaena spp.) and C. meneghiniana, which after 1 month of incubation accounted together for 50% of the biomass in contrast to less than 1.6% in control containers. Our results support the hypothesis that during the warm season and under low DIN concentration, high pH favours N 2 -cyano growth in these lakes. We provide new evidence supporting the idea that even under optimal nutrient conditions, N 2 -cyano do not thrive unless other requirements are satisfied.

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Phytoplankton and water chemistry of several alluvial pools and oxbows after the flood event - a process of diversification

Cited by 9 publications

References 0 publications

Spatial and temporal diversity of small shallow waters in river Lužnice floodplain

Spatial and temporal diversity of small shallow waters in river Lužnice floodplain

Biodiversity in Wetlands

Phytoplankton response to pH rise in a N-limited floodplain lake: relevance of N2-fixing heterocystous cyanobacteria

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