Spatial distribution of fish assemblages along environmental gradients in the temporary ponds of Northern Pantanal, Brazil

Tondato, Karina Keyla; Fantin-Cruz, Ibraim; Pedrollo, Olavo Correa; Súarez, Yzel Rondon

doi:10.4081/jlimnol.2013.e8

Cited by 8 publications

(8 citation statements)

References 47 publications

(67 reference statements)

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“…Fish community compositions are expected to vary within floodplain systems [12,24,25]. In accordance, we found large spatial variation in fish community composition reflected by differential contribution of sites to the dissimilarity between assemblages (i.e.…”

Section: Discussionsupporting

confidence: 85%

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

et al. 2017

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The Tonle Sap Lake (TSL) is a flood-pulse system. It is the largest natural lake in South-East Asia and constitutes one of the largest fisheries over the world, supporting the livelihood of million peoples. Nonetheless, the Mekong River Basin is changing rapidly due to accelerating water infrastructure development (hydropower, irrigation, flood control, and water supply) and climate change, bringing considerable modifications to the annual flood-pulse of the TSL. Such modifications are expected to have strong impacts on fish biodiversity and abundance. This paper aims to characterize the spatio-temporal variations of fish taxonomic composition and to highlights the underlying determinants of these variations. For this purpose, we used data collected from a community catch monitoring program conducted at six sites during 141 weeks, covering two full hydrological cycles. For each week, we estimated beta diversity as the total variance of the site-by-species community matrix and partitioned it into Local Contribution to Beta Diversity (LCBD) and Species Contribution to Beta Diversity (SCBD). We then performed multiple linear regressions to determine whether species richness, species abundances and water level explained the temporal variation in the contribution of site and species to beta diversity. Our results indicate strong temporal variation of beta diversity due to differential contributions of sites and species to the spatial variation of fish taxonomic composition. We further found that the direction, the shape and the relative effect of species richness, abundances and water level on temporal variation in LCBD and SCBD values greatly varied among sites, thus suggesting spatial variation in the processes leading to temporal variation in community composition. Overall, our results suggest that fish taxonomic composition is not homogeneously distributed over space and time and is likely to be impacted in the future if the flood-pulse dynamic of the system is altered by human activities.

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Section: Discussionsupporting

confidence: 85%

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

et al. 2017

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“…The multiple regression analysis showed that the abundance of the Chironomidae community, duration is the most important factor responsible for the distribution of different species of fauna and flora (Fantin-Cruz et al, 2010;Fernandes et al, 2010;Pagotto et al, 2011;Tondato et al, 2013). In this study, the genus Polypedilum occurred in 77.8% of the sampled plots, and its highest abundance was found in sites with predominance of larger sediment particles and in sites under shorter flood period.…”

Section: Relationship Between Chironomidae Community and Environmentamentioning

confidence: 77%

“…In studies with other groups, in environments with this same dynamics, the flood duration (hydroperiod) is the determining factor for the spatial distribution of species (Fantin-Cruz et al, 2008;Fernandes et al, 2010;Pagotto et al, 2011;Tondato et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Factors structuring the spatial distribution of Chironomidae larvae community in the floodplain of the northern Pantanal, Brazil

et al. 2013

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Aim: In order to identify the factors structuring the spatial distribution of the Chironomidae community, we analyzed the effects of water and sediment characteristics, flood duration and type of phytophysiognomic unit on the taxa composition of this community. Métodos: O estudo foi realizado em 26 parcelas do Sítio de Amostragem de Longa Duração (SALD), localizado em uma área sazonalmente inundável na parte norte do Pantanal (Brasil). The study was conducted at 26 plots of the Long-Term Sampling Site, located in a seasonally flooded area in northern Pantanal (Brazil). Sediment samples were taken from each plot to analyze the Chironomidae community, organic matter and particle size; limnological parameters (depth, water temperature, dissolved oxygen, electrical conductivity and pH); besides the duration of flood. Results: We identified 432 individuals distributed into 21 Chironomidae taxa. Polypedilum and Ablabesmyia were the most frequent spatially. The multivariate multiple regression analysis showed that the community composition was significantly related to the flood duration and grain size characteristics, but not to phytophysiognomic units and limnological parameters. Plots with predominantly sandy substrate and flooded for a shorter time presented a greater occurrence of taxa. Conclusions: The gradient produced by the spatial distribution of sediment grain size and flood duration determined the distribution of Chironomidae taxa. Changes in the hydrological functioning of the Pantanal, such as those from reservoir construction in the uplands region and roads and dykes construction in the floodplain could then impact the local chironomid biodiversity.Keywords: flood duration, sediment grain size, composition of community, chironomids, Pantanal.Resumo: Objetivos: Para identificar os fatores estruturadores da distribuição espacial da comunidade de Chironomidae, analisamos os efeitos das características da água e do sedimento, da duração da inundação e do tipo de unidade fitofisionômica sobre composição de táxons desta comunidade. Métodos: O estudo foi realizado em 26 parcelas do Sítio de Amostragem de Longa Duração (SALD), localizado em uma área sazonalmente inundável na parte norte do Pantanal (Brasil). Em cada parcela foram coletadas amostras de sedimento para analisar a comunidade de Chironomidae, matéria orgânica e granulometria; parâmetros limnológicos (profundidade, temperatura da água, oxigênio dissolvido, condutividade elétrica e pH); além da duração da inundação. Resultados: Foram encontrados 432 indivíduos, distribuídos em 21 taxa de Chironomidae. Os táxons Polypedilum e Ablabesmyia foram os mais frequentes espacialmente. A análise de regressão múltipla multivariada mostrou que a composição

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“…Prolonged desiccation can lead to serious oxidative stress. For example, in the moss Fontinalis antipyretica an increase in the production of reactive oxygen species (ROS) is associated with dehydration 5,6 . Protein oxidation in the dehydrated cells of the yeast Saccharomyces cerevisiae is 10 times that of hydrated cells 5,7 .…”

Section: Introductionmentioning

confidence: 99%

Transcriptome analysis of the anhydrobiotic cell line Pv11 infers the mechanism of desiccation tolerance and recovery

Yamada

Suetsugu

Deviatiiarov

et al. 2018

Sci Rep

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The larvae of the African midge, Polypedilum vanderplanki, can enter an ametabolic state called anhydrobiosis to overcome fatal desiccation stress. The Pv11 cell line, derived from P. vanderplanki embryo, shows desiccation tolerance when treated with trehalose before desiccation and resumes proliferation after rehydration. However, the molecular mechanisms of this desiccation tolerance remain unknown. Here, we performed high-throughput CAGE-seq of mRNA and a differentially expressed gene analysis in trehalose-treated, desiccated, and rehydrated Pv11 cells, followed by gene ontology analysis of the identified differentially expressed genes. We detected differentially expressed genes after trehalose treatment involved in various stress responses, detoxification of harmful chemicals, and regulation of oxidoreduction that were upregulated. In the desiccation phase, L-isoaspartyl methyltransferase and heat shock proteins were upregulated and ribosomal proteins were downregulated. Analysis of differentially expressed genes during rehydration supported the notion that homologous recombination, nucleotide excision repair, and non-homologous recombination were involved in the recovery process. This study provides initial insights into the molecular mechanisms underlying the extreme desiccation tolerance of Pv11 cells.

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Spatial distribution of fish assemblages along environmental gradients in the temporary ponds of Northern Pantanal, Brazil

Abstract: ABSTRACT

Cited by 8 publications

References 47 publications

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

Spatio-temporal variation of fish taxonomic composition in a South-East Asian flood-pulse system

Factors structuring the spatial distribution of Chironomidae larvae community in the floodplain of the northern Pantanal, Brazil

Transcriptome analysis of the anhydrobiotic cell line Pv11 infers the mechanism of desiccation tolerance and recovery

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