Abiotic Factors Influencing Piranha Attacks on Netted Fish in the Upper Paraná River, Brazil

The purpose of this study was to evaluate the role of abiotic factors on fish larvae occurrence. Samplings were carried out monthly at 12 stations (grouped in four areas) in the Amambaí, Ivaí and Paraná rivers and in the Itaipu Reservoir (upper Paraná River basin), from October 1994 to January 1995 (spawning season). Simultaneously, we obtained water temperature, pH, electrical conductivity, dissolved oxygen, water level, water velocity, and rainfall. Principal Component Analyses (PCA) and Detrended Correspondence Analyses (DCA) were applied to summarize abiotic and larvae density data, respectively. Amambaí River differed significantly from the other areas in relation to abiotic factors. Itaipu Reservoir differed significantly from the other areas considering species composition, and the Ivaí River also differed from the Paraná River. The relationship among PCA and DCA axes were significant, indicating that abiotic factors do influence larva. For example: Leporinus elongatus prefered the Amambaí River, Hypophthalmus edentatus, Plagioscion squamosissimus, and Hoplias aff. malabaricus the Itaipu Reservoir, and Pimelodus maculatus, Auchenipterus osteomystax and Iheringichthys labrosus the Ivaí River. We suggest that species selected some abiotic factors characteristic to a given environment as spawning grounds.

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First records of Freshwater Bivalves of Ilha Grande National Park, Paraná, Brazil

Iheringia Série Zoologia ◽

10.1590/1678-4766201410411420 ◽

2014 ◽

Vol 104 (1) ◽

pp. 14-20 ◽

Cited By ~ 2

Author(s):

Flávio Henrique Ragonha ◽

Gisele Daiane Pinha ◽

Danielle Katharine Petsch ◽

Maria Cristina Dreher Mansur ◽

Alice Michiyo Takeda

Keyword(s):

Organic Matter ◽

Native Species ◽

National Park ◽

Abiotic Factors ◽

Fine Sand ◽

High Water ◽

Paraná River ◽

Parana River ◽

Freshwater Bivalves ◽

Upper Paraná River

The Ilha Grande National Park, Paraná, Brazil, is located in the Upper Paraná River and has characteristics typical of a floodplains. This protected area includes lagoons connected and disconnected to the Paraná River, although the latter also connect during periods of high water level, thus composing a heterogeneous group of lacustrine environments. The enormous potential the flora and fauna diversities are still little known to the region, as can be seen through benthic invertebrates, inclunding bivalves mollusks. The granulometric composition of these floodplain lagoons was formed mainly by mud and very fine sand. Furthermore, organic matter composition was predominantly of fine particulate. The other abiotic factors differed from lagoons located within the island of the park to those located in the left margin of Paraná River. The results demonstrated the importance of abiotic factors such as the physical composition of granulometric texture, organic matter and macrophyte banks, to the establishment of bivalves in these floodplain lagoons. We recorded bivalves of Pisidium (native), Diplodon (native), and Corbicula (invasive). The highest values of Diplodon sp. density were observed at São João/C lake, for Pisidium sterkianum (Pilsbry, 1897) at São João/M lake, and to Jatobá/C lagoon with high density of invasive species Corbicula fluminea (Müller, 1774). This study to obtain conduct the first records of freshwater bivalves in floodplains lagoon in the Ilha Grande National Park, and provides contributions to better understanding the ecology of these mollusks. The recording of native species in the region of Upper Paraná River floodplain after a lomg period without new records, demonstrated the importance of protecting the lagoons of the Ilha Grande National Park as they can be a possible refuge to some species of native freshwater bivalves.

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Invertebrates associated to Eichhornea azurea Kunth in a lagoon of the Upper Paraná River: composition, community attributes and influence of abiotic factors

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x2012005000016 ◽

2012 ◽

Vol 23 (4) ◽

pp. 376-385 ◽

Cited By ~ 3

Author(s):

Valéria Flávia Batista-Silva ◽

Daiane Dias Boneto ◽

Dayani Bailly ◽

Milza Celi Fedatto Abelha ◽

Elaine Antoniassi Luiz Kashiwaqui

Keyword(s):

Dissolved Oxygen ◽

Hydrological Cycle ◽

Abiotic Factors ◽

Principal Component ◽

Paraná River ◽

Mato Grosso ◽

Rainy Period ◽

Parana River ◽

Eichhornia Azurea ◽

Upper Paraná River

AIM: We evaluated the composition and community attributes of invertebrates associated to Eichhornia azurea at Cascalho Lagoon, Upper Paraná River, Mato Grosso do Sul State, Brazil, over a hydrological cycle, as well the possible influence of abiotic factors upon these attributes. METHODS: The samplings were conducted during 2010 in the rainy and dry periods at stands of E. azurea. The attributes evaluated were abundance, richness, diversity, evenness and dominance. The abiotic factors, temperature, dissolved oxygen, pH and turbidity were summarized by a Principal Component Analysis (PCA). In order to verify possible differences between the mean values of the community attributes and the scores of the PCA axis in different periods, we employed null models analysis of variance. The influence of abiotic factors on each attribute was evaluated through Pearson correlations. RESULTS: We captured 3,052 individuals, distributed into 32 taxa, belonging to the phyllum Mollusca, Annelida, Nematoda and Arthropoda. Among the assessed attributes, only abundance and richness varied significantly between periods, with higher values during the rainy period. Chironomidade was dominant in both periods, whereas Notonectidae and Cyclopoida were rare in the rainy, and Bivalve, Decapoda, Haliplidae, Trichoptera and Pyralidae, in the dry period. A temporal distinction was evident only for the PCA axis 1, which represented gradients in temperature, dissolved oxygen and pH. Among the community attributes, only abundance was significant and negatively correlated with this axis. CONCLUSION: We attested that: i) the rainy period should add favorable conditions for invertebrates' higher richness and abundance in this macrophyte; ii) only the later attribute was influenced by limnological gradients.

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Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x12217 ◽

2017 ◽

Vol 29 (0) ◽

Cited By ~ 1

Author(s):

Janet Higuti ◽

Eliezer de Oliveira da Conceição ◽

Ramiro de Campos ◽

Vitor Góis Ferreira ◽

Jonathan da Rosa ◽

...

Keyword(s):

Beta Diversity ◽

Abiotic Factors ◽

Sampling Site ◽

Mesh Size ◽

Paraná River ◽

Sampling Effort ◽

River Floodplain ◽

Parana River ◽

Upper Paraná River ◽

Floating Macrophytes

Abstract Aim: We assessed the effect of environmental factors on the structure of periphytic ostracods communities along the river-floodplain system of the Upper Paraná River. We predict that the higher distance from Porto Primavera dam downstream would lead to higher diversity and density of the ostracods. Methods Periphytic ostracods (associated with root systems of the floating Eichhornia spp) were sampled during November 2013 to May 2015. Three samples were collected at each sampling site (channel of the Paraná River, tributaries and lakes). Eichhornia plants were removed from the water by hand and the plants were placed in a plastic bucket. Roots were washed for the removal of ostracods, and samples were filtered through a hand net with 160 µm mesh size. Results The faunistic survey recorded 44 ostracods species and richness estimators indicated that sampling effort appears to be suitable to reveal the diversity of ostracods in this studied area. The highest richness and density were observed in the stretch downstream of the dam in the main channel of Paraná River and in the lakes. Beta diversity was not significantly different along the longitudinal gradient downstream and higher similarity of ostracods species composition was observed in the lakes located in the stretch downstream of the dam. Conclusions An increase in the richness and density of ostracods were recorded in the sections downstream of the Paraná River, evidencing the importance of undammed tributaries on the ostracods community. The similarity of beta diversity amongst sampling sites may be owing to permanent hydrological connectivity amongst these environments, favouring the exchange of organisms mainly through the drift of free-floating macrophytes, and owing to the passive dispersal of drought resistant eggs of ostracods. Local abiotic factors had significant effects on abundance and distribution of some ostracod species.

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Effects of water quantity on connectivity: the case of the upper Paraná River floodplain

Ecohydrology & Hydrobiology ◽

10.2478/v10104-009-0040-x ◽

2009 ◽

Vol 9 (1) ◽

pp. 99-113 ◽

Cited By ~ 43

Author(s):

Angelo Antonio Agostinho ◽

Cláudia Costa Bonecker ◽

Luiz Carlos Gomes

Keyword(s):

Paraná River ◽

Water Quantity ◽

River Floodplain ◽

Parana River ◽

Upper Paraná River Floodplain ◽

Upper Paraná River ◽

Paraná River Floodplain

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Large scale distribution of bacterial communities in the upper Paraná River floodplain

Brazilian Journal of Microbiology ◽

10.1590/s1517-83822014000400009 ◽

2014 ◽

Vol 45 (4) ◽

pp. 1187-1197 ◽

Cited By ~ 1

Author(s):

Josiane Barros Chiaramonte ◽

Maria do Carmo Roberto ◽

Thomaz Aurélio Pagioro

Keyword(s):

Bacterial Communities ◽

Large Scale ◽

Paraná River ◽

River Floodplain ◽

Parana River ◽

Upper Paraná River Floodplain ◽

Upper Paraná River ◽

Paraná River Floodplain

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Evaluation of the Upper Paraná River discharge controlled by reservoirs

Brazilian Journal of Biology ◽

10.1590/s1519-69842009000300024 ◽

2009 ◽

Vol 69 (2 suppl) ◽

pp. 707-716 ◽

Cited By ~ 72

Author(s):

EE. Souza Filho

Keyword(s):

Paraná River ◽

River Level ◽

Parana River ◽

River Damming ◽

Discharge Rates ◽

Historical Series ◽

Discharge Regime ◽

Upper Paraná River ◽

The Relationship ◽

Different Levels

The building of large dams in the Upper Paraná River basin altered the discharge regime at the Porto São José River section. The discharge regime has been altered since 1972, but the changes intensified after the Porto Primavera damming, in late 1998. Considering that discharge control affects the relationship between channel and floodplain, this work aimed to evaluate the intensity of the discharge control that resulted from the operation of the Porto Primavera Dam. To achieve this objective, statistical analyses were carried out based on the Porto São José Fluviometric Station historical series of river level readings and discharge, between 1964 and 2007. Results showed that the average discharge increased from 1964 to 1981 and diminished after river damming. The increase of average discharge rates was followed by an increase of the duration of higher discharges at different levels of geomorphologic and limnological importance, and the reduction of average discharge during the last observed period was followed by a disproportionate decrease in the duration of the abovementioned discharges. Moreover, it is clear that the relationship between fluviometric level and fluvial discharge changed, which implies that a certain river level reading represents a higher discharge than necessary before river damming.

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