The likely effects of river impoundment on beta-diversity of a floodplain zooplankton metacommunity

Soares, Carlos Eduardo Alves; Velho, Luiz Felipe Machado; Lansac‐Tôha, Fábio Amodêo; Bonecker, Cláudia Cósta; Landeiro, Victor Lemes; Bini, Luis Maurício

doi:10.1016/j.ncon.2015.04.002

Cited by 23 publications

(12 citation statements)

References 26 publications

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“…Differences in the composition of ecological communities (bdiversity) could occur due to the replacement of some species by others among communities (turnover), or differences in species richness, wherein the species in one community are a subset of the species in another community (nestedness), or the joint action of both (Baselga & Leprieur, 2015). Most of the heterogeneous environments exhibit higher taxonomic b-diversity than homogeneous environments (Bozelli et al, 2015;Soares et al, 2015), but it is uncertain how environmental homogenisation affects functional b-diversity (Ricotta & Burrascano, 2008;Swenson, 2011), which is based on the differences in functional traits of the species (Diaz & Cabido, 2001).…”

Section: Introductionmentioning

confidence: 99%

Effects of dams decrease zooplankton functional β‐diversity in river‐associated lakes

et al. 2018

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In river–floodplain systems, the construction of dams causes environmental changes in the natural dynamics of rivers and the associated wetlands, which can affect both the taxonomic and functional composition of communities, and, consequently, ecosystem functioning. We evaluated zooplankton taxonomic and functional β‐diversity in sets of lakes associated with a preserved and a dammed river in a Neotropical floodplain. We expected that both β‐diversity measures would be lower in lakes associated with a dammed river than in lakes associated with a preserved river. β‐Diversity was partitioned into turnover and nestedness components, through multiple‐site dissimilarity measures, and compared with expected null models. We expected that nestedness would be more important for both the β‐diversity measures in lakes associated with the dammed river, whereas species and trait turnover would be more important in lakes associated with the preserved river. Functional β‐diversity was higher among lakes of the preserved river than of the dammed river, while taxonomic β‐diversity was not different between the rivers. Contributions of turnover and nestedness components were similar in the preserved river, whereas that of nestedness was higher in the dammed river, revealing the loss of extreme trait combinations from the functional space. Comparisons between observed and expected β‐diversity revealed a higher trait turnover than would be expected by species turnover in the preserved river, and no differences from the null models were observed in lakes associated with the dammed river. Our results suggest that dissimilarity in trait composition is influenced more by environmental changes associated with river damming than by dissimilarity in species composition such that a functional homogenisation occurs without a change in taxonomic β‐diversity. We propose the maintenance of preserved tributaries in floodplains, which sustain environmental heterogeneity, primarily if the nearby environments are already dammed. Furthermore, we reinforce the necessity of a pluralistic approach, considering both taxonomic and functional aspects of biodiversity in ecosystem management.

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Section: Introductionmentioning

confidence: 99%

Effects of dams decrease zooplankton functional β‐diversity in river‐associated lakes

et al. 2018

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“…Nevertheless, while several studies have distinguished nestedness from turnover in studies of spatial beta diversity (e.g. Hortal et al, 2011;Leprieur et al, 2011;Svenning, Fløjgaard & Baselga, 2011), the temporal dynamics of these patterns have been evaluated less frequently (but see Angeler, 2013 andSoares et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Productivity is considered another major driver of beta diversity (Chase & Leibold, 2002;Chase & Ryberg, 2004;Chase, 2010), including for phytoplankton (Ptacnik et al, 2010), but the conclusions regarding its role are contradictory. Some authors suggest that species-sorting mechanisms prevail in environments with limited resources because high productivity should strengthen the role of stochasticity in assembling local communities (Chase, 2010;Bini et al, 2014;Soares et al, 2015). On the other hand, Langenheder et al (2012) suggest that species-sorting mechanisms are more common during highly productive periods.…”

Section: Introductionmentioning

confidence: 99%

Temporal variation in phytoplankton beta diversity patterns and metacommunity structures across subtropical reservoirs

et al. 2017

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Summary Analysing the beta diversity components and spatial patterns of species distribution may provide key insights into how local communities respond to human‐induced environmental changes. Indeed, analysing temporal variation in spatial patterns of species distribution may reveal trends of biotic homogenisation and its likely causes. We used an eight‐year phytoplankton data set generated from to 17 reservoirs in Brazil to analyse the temporal variability in beta diversity and its turnover and nestedness components. This data set was also used to determine metacommunity structures across these subtropical reservoirs. We tested whether there was any long‐term temporal trend in beta diversity that might be indicative of biotic homogenisation or differentiation. We also tested how temporal variation was related to climatic conditions, environmental heterogeneity, productivity and cyanobacterial dominance. Lastly, we verified whether the phytoplankton metacommunity showed non‐random structure. We did not find supporting evidence for biotic homogenisation among the reservoirs. Rather, we did find that nestedness decreased during the study. Environmental heterogeneity was the main variable positively related to phytoplankton beta diversity, while high ammonium concentration and cyanobacterial abundance were negatively correlated with spatial variation among the reservoirs. Despite the noticeable temporal variation in metacommunity structures, the phytoplankton species responded similar to latent environmental gradients. Clementsian patterns found mainly in fall and winter were consistent with differences in species composition between sites, reinforcing the role of environmental filtering in driving changes in these metacommunities. Our results suggest that eutrophication control is essential to prevent biotic homogenisation, at least in our study system. We also highlight that metacommunity patterns detected in snapshot surveys should not be extrapolated temporally.

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“…The current Environmental Impact Assessment techniques are insufficient to provide a real scenario about the fish fauna conservation status. A study to understand how the impact of all dams, with a method emphasizing all information for the entire watershed is needed, thus allowing to evaluate the impacts in multi scale can be performed using beta diversity (Soares et al 2015, Socolar et al 2015. Also, it is necessary to incorporate how the Land Use Change -LUC affects the watershed in a multi-scale approach as indicated by Leal et al (2016).…”

Section: Future Directions For Monitoring and Conservation Of The Fismentioning

confidence: 99%

Impacts of the Hydroelectric Power Generation Over the Fish Fauna of the Tocantins River, Brazil: Marabá Dam, the Final Blow

Akama

2017

Oecol. Austr.

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As the eyes of environmentalists and researchers focused on the Madeira, Xingu and Tapajós rivers dams, one unknown project to bystanders will negatively affect an entire watershed, causing impacts far greater than any other megadam constructed in Brazil. Despite the environmental modifications, little is known about the UHE Marabá dam and its impacts over such a splendid cellar of species: the Araguaia-Tocantins basin. Historically the Tocantins River is the most impacted amazon tributary, with several already built dams, though the Araguaia River is free of dams. Building the UHE Marabá dam will affect both rivers, and probably extinguish many species increasing the already high number of Amazonian endangered fish species. Due to its unique evolutionary history among Amazonian tributaries, the endemicity found in the basin is probably higher than any other Amazon tributary, as some authors consider it as a different watershed, separated from the Amazon. Describing and foreseeing the impacts locally and globally are the main goals of the present study.

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The likely effects of river impoundment on beta-diversity of a floodplain zooplankton metacommunity

Abstract: NCON 21 1-7 Please cite this article in press as: Soares, C.E.A., et al., The likely effects of river impoundment on beta-diversity of a floodplain zooplankton metacommunity. Nat Conservacao. 2015. http://dx.

Cited by 23 publications

References 26 publications

Effects of dams decrease zooplankton functional β‐diversity in river‐associated lakes

Effects of dams decrease zooplankton functional β‐diversity in river‐associated lakes

Temporal variation in phytoplankton beta diversity patterns and metacommunity structures across subtropical reservoirs

Impacts of the Hydroelectric Power Generation Over the Fish Fauna of the Tocantins River, Brazil: Marabá Dam, the Final Blow

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