Effects of recurrent disturbances on the periphyton community downstream of a dammed watercourse

Zanon, Jaques Everton; Simões, NR; Rodrigues, Liliana

doi:10.1590/s1519-69842013000200005

Cited by 10 publications

(4 citation statements)

References 29 publications

(28 reference statements)

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“…Hydrological changes influence and limit the distribution and biological function of species in these ecosystems, such as freshwater algae and diatom community. Fluctuations in water level result in changes in the available habitat, light, chemical conditions, stratification, and mixing regimes subsequently affecting the composition and density of the freshwater algae (Rodrigues and Bicudo 2001;Fonseca and Rodrigues 2005;Algarte et al 2006;Leandrini et al 2008;Algarte et al 2009;Cantonati et al 2009;Murakami and Rodrigues 2009;Zanon et al 2013;Carapunarla et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Abundance of Diadesmis confervacea Kützing and Eunotia camelus Ehrenberg indicates the historical water level variation in a marsh

Ruwer

Rodrigues

2018

Braz. J. Bot

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Water level fluctuations result in changes in available habitat, affecting communities of algae and freshwater diatoms. Paleolimnological approaches assist in understanding the effects of hydrological regimes on communities over time. Therefore, the aim of this study was to identify the variation in water level due to the abundance of two diatom species, Diadesmis confervacea Kützing and Eunotia camelus Ehrenberg. Diadesmis confervacea has a periphytic habit and occurs primarily in shallow, marshy environments with high temperatures. Eunotia camelus has a planktonic habit and is mainly found in deeper environments. We analyzed the diatom fossils from sediment collected from a marsh located on Mutum Island, in the Upper Paraná River floodplain. The sediment core of 2 m was divided into layers of 2.5 cm and was dated to 830 PB using 14 C isotope. The relative abundances of the two species were obtained through quantitative analysis. The results showed a shift in the abundance of each species to the geomorphological changes and periods. The ratio of the opposing values of abundances of the two species might have been caused by changes in water levels due to ecological preferences. Competition for light between planktonic and periphytic communities also might affect algae abundance. Thus, we observed that D. confervacea and E. camelus are good indicators of hydrological changes. Therefore, our study contributes to better understand the effects of variation in water level and hydrological regime in the diatom species.

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Section: Introductionmentioning

confidence: 99%

Abundance of Diadesmis confervacea Kützing and Eunotia camelus Ehrenberg indicates the historical water level variation in a marsh

Ruwer

Rodrigues

2018

Braz. J. Bot

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“…The knowledge of the temporal and spatial dynamics of functional strategies of periphytic algae contributes to predicting, generalizing and understanding processes structuring these communities (Dunck et al 2013;Cibils et al 2015;Cibils-Martina et al 2017). Because they have a sessile life style (for the most part) and short life cycle, periphytic algae respond rapidly to environmental changes and are directly influenced by environmental alterations in temperature, water velocity, light and nutrient availability (Biggs 1996;Stevenson 1996;Bourassa and Cattaneo 2000;Moresco et al 2009;Ferragut and Bicudo 2010;Lange et al 2011;Larson and Passy 2012;Algarte et al 2013;Dunck et al 2013;Moresco and Rodrigues 2013;Rodrigues et al 2013;Zanon et al 2013). They exhibit different biological traits, varying in size, life form (unicellular, filamentous and colonial) and forms of adherence to the substrate (loosely attached and firmly attached).…”

Section: Introductionmentioning

confidence: 99%

Trait structure and functional diversity of periphytic algae in a floodplain conservation area

et al. 2018

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We aimed to evaluate the structure of periphytic algae communities, the trait distribution and the patterns of functional diversity in the last non-dammed stretch of the Upper Paraná River floodplain. We hypothesize that there is an increase in the functional diversity and a change of the traits and environmental variables structure along this floodplain. We expected an increase in the functional diversity due to the increase in tributaries propagule input leading to a functional divergence, provided by deterministic processes. The sampling was in channels, lakes and rivers in a floodplain area covering 230 km of extension of the main river. The periphyton was obtained from scraping petioles of the floating macrophyte Eichhornia azurea (Sw.) Kunth. The traits evaluated were life form and strength and form of adherence to the substrate. The functional diversity was calculated from a functional dendrogram and assembly rules. The hypotheses proposed in this study were partially accepted, since there was no increase in functional diversity along the sampled area, but we observed a change in the structure of the functional traits along the different stretches of the floodplain. The results showed diatoms as the dominant algae, and functional convergence as the assembly rule prevalent for this community. There was a large difference between local environmental factors along the floodplain. The protected areas housed the greatest functional diversity values, which was apparently influenced by the increase in functional diversity, which can be explained by the limnological factors and the input of propagules from the tributaries to the Paraná River. We noted the importance of the protected areas and local factors for assembly of this community.

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“…Research investigating the structure and functioning of biological communities on the Paraná river floodplain all point to the river's hydrological regime and tributaries as the main factors influencing the region's ecological processes (THOMAZ et al, 2007). Hydrometric level variation and its effect on aquatic communities has been examined on several occasions with regard to the Paraná river floodplain, including work focusing on the local periphyton community (ALGARTE et al, 2006(ALGARTE et al, , 2009 LEANDRINI et al, 2008;BICUDO, 2001;ZANON et al, 2013;and others). Most of these studies involved analysis of periphytic algae in their ecological context on natural substrate: the aquatic macrophyte Eichhornia azurea Kunth, which covers extensive areas on the littoral margins of different environments on the floodplain.…”

Section: Introductionmentioning

confidence: 99%

<b>Structure of the periphytic algae associated with a floating macrophyte in an open lake on the upper Paraná river floodplain, Brazil</b> - doi: 10.4025/actascibiolsci.v35i4.18663

Biolo

Rodrigues

2013

Acta Sci. Biol. Sci.

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We aimed to access the knowledge of the structure of the periphytic algae community on a floating substrate, the macrophyte Ricciocarpus natans (L.) Corda, during two hydrological periods in a connected environment at the Paraná river floodplain. Attached algal was removed from the substrate with the aid of a softbristled brush and distilled water jets and was fixed immediately for qualitative and quantitative analysis. The total richness of the periphytic algae was 188 taxa. February showed the highest species richness (154 taxa), while total species density exhibited an inverse pattern, with the highest values occurring in June (273.4 10 3 ind. cm-2). Bacillariophyceae comprised the largest fraction of density, which was reflected by the abundance of Achnanthidium minutissimum (Kütz.) Czarn. Community structure of periphytic algae in R. natans followed the same pattern of other substrates, as previously determined. This suggests that main factor acting on the structure of periphyton at the Paraná river floodplain is primarily the floodpulses regime. The hydrochoric dispersion of R. natans across the various environments comprising the floodplain favors its communities associated, as the periphytic algae, subject to passive transport via water movement. Floating rhizoids of R. natans also may act as a mesh retainer, promoting the colonization of many metaphytic and planktonic species. However, in order to better understand and delineate patterns of ecosystem functioning, it is recommended that natural substrates be used which have greater stability in the environment, such as rooted or submerged macrophyte species.

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Effects of recurrent disturbances on the periphyton community downstream of a dammed watercourse

Cited by 10 publications

References 29 publications

Abundance of Diadesmis confervacea Kützing and Eunotia camelus Ehrenberg indicates the historical water level variation in a marsh

Abundance of Diadesmis confervacea Kützing and Eunotia camelus Ehrenberg indicates the historical water level variation in a marsh

Trait structure and functional diversity of periphytic algae in a floodplain conservation area

<b>Structure of the periphytic algae associated with a floating macrophyte in an open lake on the upper Paraná river floodplain, Brazil</b> - doi: 10.4025/actascibiolsci.v35i4.18663

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