scholarly journals Effects of the hydrological regime on the ichthyofauna of riverine environments of the Upper Paraná River floodplain

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 669-680 ◽  
Author(s):  
R. Fernandes ◽  
AA. Agostinho ◽  
EA. Ferreira ◽  
CS. Pavanelli ◽  
HI. Suzuki ◽  
...  
Keyword(s):  
Species Richness ◽  
Fish Assemblage ◽  
Hydrological Cycle ◽  
Diversity Index ◽  
Principal Component ◽  
Paraná River ◽  
Analysis Of Covariance ◽  
Long Distance ◽  
Parana River ◽  
Upper Paraná River

In this work, spatial and temporal variations in the diversity (species richness and Simpson's Diversity Index) and abundance (indexed by the capture per unit effort - CPUE; total and for reproductive groups) of fish from three rivers (Baía, Ivinheima and Paraná) located in a floodplain of the Upper Paraná River basin were analyzed over a period of 20 years (1987-2007). In addition, we evaluated the relationships of these ecological attributes with variations in the hydrologic regime, considering the possible effects of natural (climatic events) and artificial (discharge control by dams) disturbances. Annual variations in hydrometric attributes were calculated using PULSO software and daily water level data. We applied analysis of covariance to determine the relationships between ecological and hydrometric attributes, the latter summarized in axes of a principal component analysis. Lower values of the fish assemblage attributes (diversity and abundance) were registered in the Paraná River. Species richness, total CPUE and CPUE of long-distance migratory species were positively related to the duration of the floods and the connectivity of the area. Variations in the annual hydrological cycle and their effects on fish assemblage appear to be affected by extreme natural (ENSO) and artificial (discharge control by dams) events.

scholarly journals Ecomorphological patterns of the fish assemblage in a tropical floodplain: effects of trophic, spatial and phylogenetic structures

2010 ◽  
Vol 8 (3) ◽  
pp. 569-586 ◽  
Author(s):  
Edson Fontes Oliveira ◽  
Erivelto Goulart ◽  
Luciani Breda ◽  
Carolina Viviana Minte-Vera ◽  
Luiz Ricardo de Souza Paiva ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Principal Component ◽  
Mantel Test ◽  
Paraná River ◽  
Trophic Guilds ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain

Ecomorphological patterns of the fish assemblage from the upper Paraná River floodplain, Brazil, were described and evaluated according to trophic (guilds), spatial (habitats) and phylogenetic (taxonomic distances) structures. The samples were obtained through the Long Term Research Project (LTER-CNPq/UEM/NUPELIA) in August and October 2001. Thirty-five species were analyzed from thirty-one morphological variables. Strong significant correlations (Mantel test) between morphology and trophic guilds and between morphology and taxonomy were found, while morphology and habitat revealed a weak correlation. However, the partial Mantel test showed that the correlations between morphology and trophic guilds persist even when the effect of taxonomy is discounted. The ecomorphological pattern shown by the Principal Component Analysis separated species according to locomotion structures used in feeding. At one extreme there are the piscivores and insectivores that exploit lentic habitats and have compressed bodies and well developed anal fins, while at the other there are detritivores and invertivores that exploit lotic and semi-lotic habitats and have depressed bodies and well developed pectoral, pelvic and caudal fins. Canonical Discriminant Analysis using ecomorphological variables successfully predicted 94.5% of the trophic guild ecomorphotypes, but only 57.1% of the habitat ecomorphotypes. These data indicate that the fish assemblage of the upper Paraná River floodplain is structured ecomorphologically mainly according to trophic structure rather than habitat.

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

2012 ◽  
Vol 23 (4) ◽  
pp. 376-385 ◽  
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.

scholarly journals Spatial and seasonal patterns in fish assemblage in Corrego Rico, upper Parana River basin

2013 ◽  
Vol 11 (1) ◽  
pp. 143-152 ◽  
Author(s):  
Erico L. H Takahashi ◽  
Fabricio R. T. Rosa ◽  
Francisco Langeani ◽  
Laura S. O. Nakaghi
Keyword(s):  
River Basin ◽  
Fish Assemblage ◽  
Assemblage Structure ◽  
Paraná River ◽  
Fish Assemblage Structure ◽  
Water Parameters ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

The upper Paraná River basin drains areas of intensive industry and agriculture, suffering negative impacts. The Córrego Rico flows through sugar cane fields and receives urban wastewater. The aim of this work is to describe and to compare the fish assemblage structure in Córrego Rico. Six standardized bimonthly samples were collected between August 2008 and June 2009 in seven different stretches of Córrego Rico. Fishes were collected with an experimental seine and sieves, euthanized, fixed in formalin and preserved in ethanol for counting and identification. Data were recorded for water parameters, instream habitat and riparian features within each stretch. Non-metric multidimensional scaling, species richness and diversity analysis were performed to examine spatial and seasonal variation in assemblage structure. Fish assemblage structure was correlated with instream habitat and water parameters. The fish assemblage was divided in three groups: upper, middle and lower reaches. High values of richness and diversity were observed in the upper and lower stretches due to connectivity with a small lake and Mogi Guaçu River, respectively. Middle stretches showed low values of richness and diversity suggesting that a small dam in the middle stretch negatively impacts the fish assemblage. Seasonal differences in fish assemblage structure were observed only in the lower stretches.

scholarly journals Species richness and abundance of bats in fragments of the stational semidecidual forest, Upper Paraná River, southern Brazil

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 727-734 ◽  
Author(s):  
H. Ortêncio-Filho ◽  
NR. Reis
Keyword(s):  
Species Richness ◽  
Anthropogenic Impacts ◽  
Paraná River ◽  
Forest Fragments ◽  
Southern Brazil ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Species Richness And Abundance ◽  
Artibeus Lituratus

The Upper Paraná River floodplain is inserted in a region of the Mata Atlântica biome, which is a critical area to preserve. Due to the scarcity of researches about the chiropterofauna in this region, the present study investigated species richness and abundance of bats in remnants from the stational semidecidual forest of the Upper Paraná River, southern Brazil. Samplings were taken every month, from January to December 2006, using 32 mist nets with 8.0 x 2.5 m, resulting in 640 m²/h and totaling a capture effort of 87,040 m²/h. In order to estimate the species richness, the following estimators were employed Chao1 and Jack2. During the study, a total of 563 individuals belonging to 17 species (Artibeus planirostris, Artibeus lituratus, Carollia perspicillata, Platyrrhinus lineatus, Sturnira lilium, Artibeus fimbriatus, Myotis nigricans, Desmodus rotundus, Artibeus obscurus, Noctilio albiventris, Phylostomus discolor, Phylostomus hastatus, Chrotopterus auritus, Lasiurus ega, Chiroderma villosum, Pygoderma bilabiatum and Lasiurus blossevillii) were captured. The estimated richness curves tended to stabilize, indicating that most of the species were sampled. Captured species represented 10% of the taxa recorded in Brazil and 28% in Paraná State, revealing the importance of this area for the diversity of bats. These findings indicate the need to determine actions aiming to restrict human activities in these forest fragments, in order to minimize anthropogenic impacts on the chiropterofauna.

scholarly journals Periphytic algal community in lentic environments of the Upper Paraná River floodplain: seasonal and spatial variation

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Kisay Lorena Adame ◽  
Barbara Dunck ◽  
Liliana Rodrigues
Keyword(s):  
Species Richness ◽  
Seasonal Variation ◽  
Hydrological Regime ◽  
Paraná River ◽  
Algal Community ◽  
River Floodplain ◽  
Periphytic Algae ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River

Abstract Aim: This study aimed to evaluate the influence of seasonal variation in the hydrological regime and of limnological variables on species richness of periphytic algae in lakes of the Upper Paraná River floodplain. Methods The study area is located in the last undammed stretch of the Paraná River in this floodplain, in which three lakes were sampled quarterly (May, August and November 2014, and February and May 2015) for one year. The periphytic material was obtained from petioles of the aquatic macrophyte Eichhornia azurea (Sw.) Kunth. Results We registered 149 taxa of periphytic algae, distributed in 9 classes. Algal richness changed as a function of the seasonal dynamics of the Paraná River’s hydrological regime. Water level fluctuations directly influenced periphytic algae species. During periods of high water level, species richness increased. Limnological variables showed a close relationship with the hydrological regime, and the dissolved nutrients and turbidity were the abiotic factors that most influenced the algal community. The following species were present in all lakes: Fragilaria capucina Desmazières, Gomphonema gracile Ehrenberg and Navicula cryptotenella Lange-Bertalot (Bacillariophyceae) and two species of the genus Oedogonium (Oedogoniophyceae). Conclusions The hydrological regime of the Paraná River played an important role in structuring communities of periphytic algae. Seasonal variation in hydrological regime and in limnological variables together influenced the species richness of these organisms in these floodplain lakes.

scholarly journals Effects of a small natural barrier on the spatial distribution of the fish assemblage in the Verde River, Upper Paraná River Basin,Brazil

2016 ◽  
Vol 76 (4) ◽  
pp. 851-863 ◽  
Author(s):  
J. C. Silva ◽  
É. A. Gubiani ◽  
P. A. Piana ◽  
R. L. Delariva
Keyword(s):  
Spatial Distribution ◽  
Species Richness ◽  
River Basin ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Parana River ◽  
Verde River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Natural Barrier

Abstract Geographical barriers influence species distribution and play an important role in the segregation of fish assemblages. The present study aims to test the influence of a small natural barrier on the spatial distribution of fish species in the Verde River, Upper Paraná River Basin, Brazil, considering two biotopes: upstream and downstream of the Branca Waterfall. We observed the highest species richness downstream of the Branca Waterfall, which also had the highest number of exclusive species. Richness, evenness, and abundance varied significantly among biotopes. The composition and structure of the fish assemblage differed between biotopes, which were characterized by different indicator species, mainly downstream of the Branca Waterfall. Physical and chemical variables and geographical distance between sites were not responsible for the differences observed. Hence, the present study shows that small barriers can also be crucial in structuring fish fauna and play a key role in the segregation of fish assemblages.

scholarly journals Influence of tributaries on the periphytic diatom community in a floodplain

2017 ◽  
Vol 29 (0) ◽  
Author(s):  
Andressa Bichoff ◽  
Nicolli Cristina Osório ◽  
Daiane Trevisan Ruwer ◽  
Kisay Lorena Adame Montoya ◽  
Bárbara Dunck ◽  
...  
Keyword(s):  
Species Richness ◽  
Protected Area ◽  
Paraná River ◽  
Diatom Community ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain ◽  
Periphytic Diatom

Abstract In impacted floodplains, small tributaries have an essential role in the maintenance of ecosystem biodiversity. Aim: We aimed to characterise the periphytic diatom community (Bacillariophyta) in a protected area at the Upper Paraná River floodplain considering the importance of tributaries as a source of propagules. The purpose of this study was to understand the influence of the tributaries in the periphytic diatom community (Bacillariophyta) in a protected area at the Upper Paraná River floodplain. We expect that species present in the main river channel (mainly in the last stretch) would be a subset of the community present in the tributaries. Methods The study area is located in the last non-dammed stretch of the Paraná River in this floodplain, with the contribution of several tributaries. Sampling was performed in 2014 in two tributaries and three sites at the Paraná River main channel, and the periphytic material was obtained from petioles of the aquatic macrophyte Eichhornia azurea (Sw.) Kunth. Results We identified 115 diatom taxa. Higher values of species richness were registered in the tributaries, and higher densities in the tributaries and at sampling sites under the direct influence of the tributaries. We also observed a higher similarity between the tributaries, which are located in the preserved side of the floodplain. The results of beta diversity showed that closer sites had lower values, and that the species turnover was the component more important in this floodplain. Conclusion In this way, these results reinforce the importance of tributaries mainly on the algae establishment and development reflected in the density of species. It demonstrates that sites in preserved area present a higher species richness and can serve as a pool of propagules for downstream environments.

scholarly journals Fish larvae from the upper Paraná River: do abiotic factors affect larval density?

2008 ◽  
Vol 6 (4) ◽  
pp. 551-558 ◽  
Author(s):  
Gilmar Baumgartner ◽  
Keshiyu Nakatani ◽  
Luiz Carlos Gomes ◽  
Andréa Bialetzki ◽  
Paulo Vanderlei Sanches ◽  
...  
Keyword(s):  
Fish Larvae ◽  
Abiotic Factors ◽  
Larval Density ◽  
Principal Component ◽  
Paraná River ◽  
The Other ◽  
Parana River ◽  
Upper Paraná River ◽  
Iheringichthys Labrosus

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.

The impact of a dam on the helminth fauna and health of a neotropical fish species Salminus brasiliensis (Cuvier 1816) from the upper Paraná River, Brazil

2012 ◽  
Vol 87 (2) ◽  
pp. 245-251 ◽  
Author(s):  
L.C. Karling ◽  
A. Isaac ◽  
I.P. Affonso ◽  
R.M. Takemoto ◽  
G.C. Pavanelli
Keyword(s):  
Hydroelectric Plant ◽  
Diversity Index ◽  
Nematode Species ◽  
Paraná River ◽  
Helminth Parasites ◽  
Neotropical Fish ◽  
Parana River ◽  
Upper Paraná River ◽  
The Impact ◽  
Salminus Brasiliensis

AbstractThe aim of the present study was to detect changes in the structure of the helminth parasite infracommunities in Salminus brasiliensis (Cuvier 1816) from the floodplain of the upper Paraná River after construction of the Porto Primavera Hydroelectric Plant. A total of 126 fish in the period before the dam's construction and 56 specimens 10 years after this event were analysed. Three species of parasites were collected before the construction of the dam: Prosthenhysteraobesa Diesing, 1850 (Digenea), Cladocystis intestinalis Vaz, 1932 (Digenea) and Monticellia coryphicephala Monticelli, 1892 (Cestoda), and one nematode species in the larval stage, whose identification was not possible. After dam construction, the following helminth parasites were found: C. intestinalis, M. coryphicephala, Octospiniferoides incognita, Contracaecum spp. larvae and Contracaecum sp. type 2 larvae Moravec, Kohn & Fernandes 1993. The diversity of helminth parasites measured by the Brillouin diversity index (HB) differed significantly between the pre- and post-dam periods (mean HB = 0.069 and HB = 0.2, respectively; P= 0.0479; Mann–Whitney U test). The parasite community of S. brasiliensis before the construction of the dam showed concentration of dominance (C) of P. obesa (C = 0.38), while there was no concentration of dominance of any species of parasite (C = 0.22) after the dam's construction. Before the Porto Primavera dam the relative condition factor of fish was 1.0; after the dam's construction it was 0.93 (P <  0.0001; Mann–Whitney U test). This study records the disappearance of the species P. obesa and suggests that there has been local extinction of this parasite. The results show that the anthropic influence on natural systems is interfering with the welfare and health of S. brasiliensis, reflected by its fauna of helminth parasites.

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