Periphytic diatom ecological guilds in floodplain: Ten years after dam

Algarte, Vanessa Majewski; Dunck, Bárbara; Leandrini, Josimeire Aparecida; Rodrigues, Liliana

doi:10.1016/j.ecolind.2016.04.049

Cited by 25 publications

(25 citation statements)

References 55 publications

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“…Despite the difference of the applied dissimilarity measures, their findings also supported pure species turnover (Algarte et al, 2016), similar to our observations.…”

Section: Main Forces In β-Diversitysupporting

confidence: 91%

“…Partitioning of overall β-diversity revealed that dissimilarity of diatom communities originates mainly from the replacement of species in one community by different species in the other community (namely, as a result of high species turnover). Algarte et al (2016) reported 50% mean β-diversity for periphytic diatoms in lakes connected to the Paraná River, however the authors calculated pair-wise dissimilarity instead of multiple-site dissimilarity because they focused on β-diversity between each pair of lakes among the sampling years.…”

Section: Main Forces In β-Diversitymentioning

confidence: 99%

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Structuring forces and β-diversity of benthic diatom metacommunities in soda pans of the Carpathian Basin

Szabó

Lengyel

Padisák

et al. 2018

European Journal of Phycology

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Small soda lakes represent one of the most vulnerable ecosystem types due to their high hydrological sensitivity to climate change and anthropogenic interventions. Since diatoms are excellent bioindicators, determining the β-diversity and the structuring dynamics of diatom metacommunities can provide valuable information for conservation planning of soda pans. In this study, two diatom metacommunities were surveyed monthly in a one-year period from distinct regions of the Carpathian basin: the Fertő-Hanság National Park (FH) between 2013 and 2014, and the Danube-Tisza Interfluve (DT) between 2014 and 2015. We explored whether β-diversity of diatom assemblages in the two regions is enhanced by species turnover or nestedness (related to richness differences) and investigated the role of deterministic and stochastic processes in shaping β-diversity patterns. Furthermore, we evaluated the contribution of environmental variables, geographic distance and temporal variation to community structure. High β-diversity (> 90%) was revealed for both metacommunities, and was maintained primarily by species turnover. Within the metacommunity of the DT where the natural hydrological cycle of soda pans is not disturbed, diatom communities assembled mainly by the selection force of environment at spatiotemporal scale. In the soda pans located in the habitat reconstruction area of the FH, besides species-sorting, significant temporal variation in community structure appeared due to the water management and periodic water supply. Our results point to the need for a conservation management strategy which maintains the natural hydrological regime of small saline lakes, and therefore their habitat heterogeneity which is of high conservation value.

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“…Despite the difference of the applied dissimilarity measures, their findings also supported pure species turnover (Algarte et al, 2016), similar to our observations.…”

Section: Main Forces In β-Diversitysupporting

confidence: 91%

Section: Main Forces In β-Diversitymentioning

confidence: 99%

Structuring forces and β-diversity of benthic diatom metacommunities in soda pans of the Carpathian Basin

Szabó

Lengyel

Padisák

et al. 2018

European Journal of Phycology

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“…Our results clearly indicated that benthic diatom assemblages at biomonitoring sites downstream of water supply reservoirs were significantly different from assemblages at control sites and that these differences extended beyond the scale of individual reservoirs. Our results are in keeping with findings in the wider literature, predominantly on individual dams (Blinn et al, 1989;Uehlinger et al, 2003;Wu et al, 2009;Cibils Martina et al, 2013;Gallo et al, 2015;Algarte et al, 2016). Large-scale studies on the subject are rare, but two regional-scale Australian studies involving eight water supply reservoirs found that diatom assemblages downstream of reservoirs differed from assemblages inhabiting upstream sites (Growns, 1999;Growns and Growns, 2001).…”

Section: Changes In Assemblage Structuresupporting

confidence: 90%

“…Very few studies have used ecological guilds to quantify the effect of impoundment on benthic diatom assemblages (e.g. Algarte et al, 2016). A study on the Achiras Stream (Argentina), using an alternative morphological guild classification, reported that the benthic diatom assemblage downstream of the reservoir comprised a higher percentage of late-succession species than upstream, which was linked to a reduced seasonality and variability of flow (Cibils Martina et al, 2013).…”

Section: Changes In Taxa Richness Ecological Guilds and Speciesmentioning

confidence: 99%

“…Blinn et al, 1989;Growns, 1999;Gallo et al, 2015) and biomass (Uehlinger et al, 2003;Nichols et al, 2006) downstream of hydropower (Peterson, 1986;Wu et al, 2009) and water supply structures (Boix et al, 2010). Comparisons of pre-and post-impoundment diatom assemblages are rare in the scientific literature due to a general absence of pre-impoundment monitoring data (but see Cibils Martina et al, 2013;Algarte et al, 2016). As a result, most studies have used non-regulated control sites (upstream or on unregulated tributaries) that are assumed to represent reference conditions at downstream sites.…”

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confidence: 99%

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Peer Review #1 of "Diatoms as indicators of the effects of river impoundment at multiple spatial scales (v0.1)"

2019

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River impoundment constitutes one of the most important anthropogenic impacts on the World's rivers. An increasing number of studies have tried to quantify the effects of river impoundment on riverine ecosystems over the past two decades, often focusing on the effects of individual large reservoirs. This study is one of the first to use a large-scale, multi-year diatom dataset from a routine biomonitoring network to analyse sample sites downstream of a large number of water supply reservoirs (n = 77) and to compare them with paired unregulated control sites. We analysed benthic diatom assemblage structure and a set of derived indices, including ecological guilds, in tandem with multiple spatiotemporal variables to disclose patterns of ecological responses to reservoirs beyond the site-specific scale. Diatom assemblage structure at sites downstream of water supply reservoirs was significantly different to control sites, with the effect being most evident at the regional scale. We found that regional influences were important drivers of differences in assemblage structure at the national scale, although this effect was weaker at downstream sites, indicating the homogenising effect of river impoundment on diatom assemblages. Sites downstream of reservoirs typically exhibited a higher taxonomic richness, with the strongest increases found within the motile guild. In addition, Trophic Diatom Index (TDI) values were typically higher at downstream sites. Water quality gradients appeared to be an important driver of diatom assemblages, but the influence of other abiotic factors could not be ruled out and should be investigated further. Our results demonstrate the value of diatom assemblage data from national-scale biomonitoring networks to detect the effects of water supply reservoirs on instream communities at large spatial scales. This information may assist water resource managers with the future implementation of mitigation measures such as setting environmental flow targets.

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Simplification and replacement of diatom functional traits from a subtropical floodplain lakes paleolimnological records

Ruwer

Rodrigues

2021

Limnology

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An effective way to access processes of ecological communities and ecosystems is the use of functional traits; therefore, the use of the functional characteristics of diatoms in paleolimnological works has been growing. In this study, the variations in the abundance of functional traits of sedimentary diatoms were evaluated in two lakes (Garças Lake and Patos Lake), from a subtropical floodplain, which present different intensities of influence of dams. Diatom community functional diversity and functional beta decomposed were calculated. A core from each environment was collected and samples of approximately 50 years were used. According to the functional diversity results, the two lakes showed different patterns, with a greater functional variation in Garças Lake. Through functional beta diversity results, the lakes showed similar results. Both showed a reduction in the functional diversity values and substitution of traits, after the 1980s in Garças Lake, and after ~ 2008 in Patos Lake. In these periods, both environments showed dominance of the same functional categories related to high turbulence and lower waters. The results suggest hydrological changes in the two lakes, which may have been driven by dams close to the floodplain.

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Periphytic diatom ecological guilds in floodplain: Ten years after dam

Cited by 25 publications

References 55 publications

Structuring forces and β-diversity of benthic diatom metacommunities in soda pans of the Carpathian Basin

Structuring forces and β-diversity of benthic diatom metacommunities in soda pans of the Carpathian Basin

Peer Review #1 of "Diatoms as indicators of the effects of river impoundment at multiple spatial scales (v0.1)"

Simplification and replacement of diatom functional traits from a subtropical floodplain lakes paleolimnological records

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