Benthos of a large neotropical river: spatial patterns and species assemblages in the Lower Paraguay and its floodplains

Drago, Inés Ezcurra de; Marchese, Mercedes; Wantzen, Karl M.

doi:10.1127/0003-9136/2004/0160-0347

Cited by 40 publications

(15 citation statements)

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“…RFSs are characterized by high habitat heterogeneity (e.g., Junk et al, 1989;Tockner et al, 2000a, b;Drago et al, 2004). Besides several ecotonal habitats, which are found in the aquatic terrestrial transition zone (ATTZ) (Junk et al, 1989), RFSs have a wide variety of aquatic habitats, such as temporal and permanent lagoons, channels, backwaters, shallow lakes, sloughs, and the main river channel.…”

Section: The Patternmentioning

confidence: 98%

Floods increase similarity among aquatic habitats in river-floodplain systems

2006

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During low water levels, habitats in river-floodplain systems are isolated from each other and from the main river. Oppositely, floods tend to connect water bodies with distinct hydrological characteristics and, as a result, ecological processes and biological communities tend to be more similar among the distinct habitats that comprise a river-floodplain system. Based on a literature review and also using unpublished data obtained in tropical floodplains, the aim of this paper is to highlight the effects of floods as a process that reduce spatial variability. The usual negative relationship between the coefficient of variation of any ecological indicator (e.g., chlorophyll-a or total phosphorus) and water level is the main result demonstrating a reduction in spatial variability due to floods. Considering physical, chemical or biotic data gathered in distinct habitats within the floodplain, this pattern was found in temperate and tropical regions, subjected to distinct levels of anthropogenic impacts, and at different spatial extents. The main mechanism that accounts for this pattern may be stated as follow. During low water level, the biological communities of each habitat in the floodplain (e.g., lagoons, backwater, streams) follow distinct temporal trajectories due to the effects of local driving forces (e.g., an efficient predator trapped in a lagoon but not in another). Management plans and biodiversity conservation in river floodplain systems will benefit by considering the effects of flood homogenization and increased connectivity peculiar to these unique ecosystems.

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Section: The Patternmentioning

confidence: 98%

Floods increase similarity among aquatic habitats in river-floodplain systems

2006

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“…Among macroinvertebrates, Oligochaeta are some of the most abundant groups, as they are present in almost all fresh water environments. They play an important role in the structuring of sediment (Drago et al, 2004;Marchese, 2009) and as a food source for other aquatic organisms (Reynoldson & Rodriguez, 1999;Prygiel et al, 2000). They tolerate low levels of dissolved oxygen well (Verdonschot, 1989).…”

Section: Introductionmentioning

confidence: 99%

Is similar the distribution of Chironomidae (Diptera) and Oligochaeta (Annelida, Clitellata) in a river and a lateral fluvial area?

Cesar

Henry

2017

Acta Limnol. Bras.

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Numerous factors may affect the pattern of distribution of benthic fauna in a river mouth region and, among the macroinvertebrates, Chironomidae and Oligochaeta are the most abundant groups and most tolerant to environmental changes. Aim: The aim of this study was to evaluate the controlling factors of and a possible similarity between Chironomidae and Oligochaeta assemblies at two close sites, the mouth of the Guareí River into the Paranapanema River (São Paulo, Brazil) and its lateral fluvial area. Methods: Fauna samples were collected every three months during one year. Water physical and chemical variables and sediment variables were also determined in the same period. Results: Both assemblies presented low density variability over time in the lateral area due to sediment characteristics and environmental factors. Taxa Caladomyia, Parachironomus, Pristina sp., Pristina osborni, Bothrioneurum and Opistocysta funiculus were recorded at this site. The Guareí River presented both greater temporal and spatial variations, attributed mainly to a reduction in the water level. Greater organism abundance, especially of Chironomus and Tubificinae, was observed in the river. Conclusions: Dissimilarity in temporal and spatial distributions of Chironomidae and Oligochaeta was attributed to peculiar characteristics of the two study sites, a river channel and a lateral area. Reduction in the water level over the year was the main controlling factor of Chironomidae and Oligochaeta richness and density in the river. In the lateral area, the presence and abundance of certain taxa were determined by the nature of the sediment and water physical and chemical variables.Keywords: mouth zone; water level; sediment; macroinvertebrates.Resumo: Diversos fatores podem afetar o padrão de distribuição da fauna bentônica em regiões de desembocadura de rios e, entre os macroinvertebrados, Chironomidae e Oligochaeta são os grupos mais abundantes e tolerantes às alterações ambientais. Objetivo: O objetivo deste estudo foi avaliar a possível similaridade e os fatores controladores entre as assembleias de Chironomidae e Oligochaeta em dois locais próximos, a zona de desembocadura do rio Guareí no rio Paranapanema (SP, Brasil) e sua área fluvial lateral. Métodos: As amostras de fauna foram coletadas a cada três meses durante um ano. As variáveis físico-químicas da água e sedimento também foram determinadas no mesmo período. Resultados: Ambas as assembleias apresentaram baixa variabilidade temporal nas densidades na área lateral devido às características do sedimento e dos fatores ambientais. Caladomyia, Parachironomus, Pristina sp., Pristina osborni, Bothrioneurum e Opistocysta funiculus foram registradas neste local. O rio This is an Open

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“…These organisms are very sensitive to physical and chemical disturbances (Furse et al, 2006;Jesús-Crespo and Ramírez, 2011), which lead to reductions in diversity and abundance and increased dominance of species that can tolerate adverse conditions (Smith and Lamp, 2008;Jesús-Crespo and Ramírez, 2011;Wang et al, 2012) Within benthic invertebrates, Oligochaeta are one of the most abundant groups, in almost all freshwater environments and particularly in the Paraná River floodplain (Takeda, 1999), and have an important role in structuring the sediment of freshwater ecosystems (Drago et al, 2004;Marchese, 2009). Oligochaeta assemblages are influenced by the type of substrate, food availability, and especially the flood pulse (Stevaux and Takeda, 2002;Behrend et al, 2009) and hydro-morphological characteristics (Blettler et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Tributaries as richness source for Oligochaeta assemblage (Annelida) of Neotropical dammed river

et al. 2014

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Tributaries may serve as richness source for the river main channel and the zoobenthos community is a good tool to verify this kind of pattern. In this study, we aimed to characterize the benthic invertebrate assemblage in three tributaries associated to the Paraná River main channel, focusing in Oligochaeta community. We hypothesized that (i) in tributaries, Oligochaeta are richer than the main river (Paraná River) and (ii) dammed tributary (Paranapanema River) is poorly diverse than the others. Samples were conducted in Paranapanema, Baía and Ivinhema tributaries using a modified Petersen grab along three transects (samples conducted inside the tributary, in the mouth of each tributary and inside Paraná River). To analyze (i) the difference between the richness and density among the tributaries and the Paraná River and (ii) effect of each tributary transect on the Oligochaeta richness we used a nonparametric Kruskal-Wallis test. Changes in environmental variables and in richness and composition of Oligochaeta were summarized by Canonic Correspondence Analysis. It was registered 21 different benthic invertebrates taxa, being Oligochaeta assemblage with the highest density. Within Oligochaeta, Narapa bonettoi was the most abundant species, followed by Haplotaxis aedochaeta and Paranadrilus descolei. In our results we refused both hypotheses, because we did not found significant differences for richness and density between the tributaries and the main river, and also no difference between the three transects of each tributary were found. However, the tributaries less influenced by damming, especially the Baía recorded high richness. This corroborates their importance to diversity in the floodplain and the species of Oligochaeta reflect the peculiar characteristics of habitats within each tributaries.Keywords: Narapa bonettoi, benthic invertebrate, sediments, floodplain, biodiversity. Tributários como fontes de riqueza para assembleia de Oligochaeta (Annelida) de um rio Neotropical represado ResumoTributários podem servir como fonte de riqueza para o canal principal do rio e a comunidade de zoobentos é uma boa ferramenta para verificar esse tipo de padrão. Neste estudo, que teve como objetivo caracterizar as assembleias de invertebrados bentônicos em três tributários associados ao canal principal do rio Paraná, com foco na comunidade de Oligochaeta. Nossa hipótese é que (i) em afluentes a assembleia de Oligochaeta apresenta maior riqueza do que o rio principal (rio Paraná), e (ii) o tributário represado (Rio Paranapanema) é menos diverso do que os demais. As amostras foram realizadas nos tributários Paranapanema, Baía e Ivinhema utilizando uma draga Petersen modificado ao longo de três transectos (amostras realizadas dentro do afluente, na boca de cada afluente e no interior do Rio Paraná). Para analisar (i) a diferença na riqueza e densidade entre os afluentes e o rio Paraná, e (ii) o efeito de cada transecto do tributário sobre a riqueza Oligochaeta foi utilizado um teste de Kruskal-Wallis não paramétric...

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Benthos of a large neotropical river: spatial patterns and species assemblages in the Lower Paraguay and its floodplains

Cited by 40 publications

References 0 publications

Floods increase similarity among aquatic habitats in river-floodplain systems

Floods increase similarity among aquatic habitats in river-floodplain systems

Is similar the distribution of Chironomidae (Diptera) and Oligochaeta (Annelida, Clitellata) in a river and a lateral fluvial area?

Tributaries as richness source for Oligochaeta assemblage (Annelida) of Neotropical dammed river

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