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.

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.

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

1997 ◽  
Vol 17 (3) ◽  
pp. 712-718 ◽  
Author(s):  
Carlos Sérgio Agostinho ◽  
Angelo Antonio Agostinho ◽  
Elineide Eugenio Marques ◽  
Luis Mauricio Bini
Keyword(s):  
Abiotic Factors ◽  
Paraná River ◽  
Parana River ◽  
Factors Influencing ◽  
Upper Paraná River

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

2014 ◽  
Vol 104 (1) ◽  
pp. 14-20 ◽  
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.

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 The ichthyofauna of drifting macrophyte mats in the Ivinhema River, upper Paraná River basin, Brazil

2011 ◽  
Vol 9 (2) ◽  
pp. 403-409 ◽  
Author(s):  
Cíntia Karen Bulla ◽  
Luiz Carlos Gomes ◽  
Leandro Esteban Miranda ◽  
Angelo Antonio Agostinho
Keyword(s):  
Fish Assemblages ◽  
Mesh Size ◽  
Paraná River ◽  
Parana River ◽  
Main River ◽  
Main River Channel ◽  
Dispersal Vectors ◽  
Upper Paraná River ◽  
Number Of Individuals

We describe the fish assemblages associated with drifting macrophyte mats and consider their possible role as dispersal vectors in the Ivinhema River, a major tributary of the upper Paraná River, Brazil. Fish associated with drifting mats were sampled in the main river channel during January and March 2005, when the wind and/or the increased water level were sufficient to transport macrophyte stands. Fish in the drifting mats were sampled with a floating sieve (4 m long x 2 m wide x 0.6 m high, and 2 mm mesh size). In the laboratory, larvae, juvenile, and adult fish were counted and identified to the lowest possible taxonomic level. In four drifting macrophyte mats we captured 218 individuals belonging to at least 28 species, 17 families, and 6 orders. Aphyocharax dentatus, Serrasalmus spp., and Trachelyopterus galeatus were the most abundant taxa associated with the mats, but species richness ranged from 6 to 24 species per mat. In addition, 85% of the total number of individuals caught was larvae and juveniles. Although preliminary and based on limited samples, this study of drifting macrophyte mats was the first one in the last unregulated stretch of the Paraná River remaining inside Brazilian territory, and alerts us to the potential role of macrophytes mats as dispersers of fish species in the region.

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 Larvae occurrences of Rhamdia quelen (Quoy & Gaimard, 1824) (Siluriformes: Heptapteridae) in an area under dam influence in the upper Paraná River region, Brazil

2011 ◽  
Vol 9 (2) ◽  
pp. 419-426 ◽  
Author(s):  
Evelyn B. da Silva ◽  
Pablo H. dos Santos Picapedra ◽  
Paulo V. Sanches ◽  
Renato E. O. de Rezende ◽  
Aline M. Gavião ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Pearson Correlation ◽  
Larval Density ◽  
Principal Component ◽  
Reproductive Activity ◽  
Paraná River ◽  
Negative Effects ◽  
Parana River ◽  
River Region ◽  
Rhamdia Quelen

Rhamdia quelen (Jundiá) is a catfish species of great interest to fish producers and researchers due to several favorable characteristics for inclusion in the Brazilian list of commercially raised fish. It has a wide geographical distribution, with occurrences reported from Central Argentina to South Mexico. Studies on the biological aspects of this species have been limited to captive adult fishes that were researched for farming purposes. Research related to ichthyoplankton has provided valuable information on spawning periods and sites and other aspects of breeding for numerous species of fish. This information is crucial for implementing management and protection strategies for these species. The studied floodplain is located in a lotic remnant between the Reservoirs of Itaipu and Engenheiro Sérgio Motta. This area is located inside a protected area (Ilha Grande National Park) in the last portion of dam-free land along the Paraná River in the Brazilian territory; however, it is still threatened by the negative effects of the dams. We conducted monthly nocturnal collections during four periods from October to March, 2003 to 2007, in 22 locations along the main channel, secondary lakes and main tributaries of the Paraná River. After collection, the individuals were classified according to the degree of development and the notochord flexion and caudal fin support elements. Data were analyzed using principal component analysis (PCA), ANOVA and Pearson correlation to relate abiotic and larval density data. The increase of capture abundances in the four studied stages suggests that R. quelen is finding conditions that are favorable to its reproduction. The increase in captures can generate questions regarding R. quelen reproductive activity, for instance, whether the species is adapting or is influenced by environmental changes created by the Paraná River dams.

scholarly journals Copepod assemblage structure (Crustacea: Copepoda) along a longitudinal environmental gradient in a tropical river-floodplain system, Brazil

2017 ◽  
Vol 29 (0) ◽  
Author(s):  
Welinton Sousa Palhiarini ◽  
Leilane Talita Fatoreto Schwind ◽  
Rodrigo Leite Arrieira ◽  
Luiz Felipe Machado Velho ◽  
Fábio Amodêo Lansac-Tôha
Keyword(s):  
Organic Matter ◽  
Species Richness ◽  
Environmental Gradient ◽  
Paraná River ◽  
The Other ◽  
River Floodplain ◽  
Suspended Organic Matter ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River

Abstract Aim: In this study, we analyzed the structure of the copepod community along a longitudinal axis of the last undammed stretch of the Upper Paraná River floodplain, downstream of Porto Primavera reservoir. We hypothesized that (i) copepod assemblage would show an increase in the abundance of organisms, species richness and specific diversity with the distance from the Porto Primavera reservoir, due to the arrival of species from adjacent lakes and tributaries; (ii) copepod abundance and species richness would be higher in tributaries and adjacent lakes located at the floodplain, which show higher environmental heterogeneity and function as a species source; and (iii) spatial patterns of copepod assemblage structure are related to the environmental gradient, since copepods show a rapid response to the variation of environmental conditions. Method Sampling was performed quarterly from August 2013 to July 2014, at the subsurface of the pelagic region. Sampling sites were located along the Paraná River, in seven of its tributaries, and in eight lakes located in its floodplain. Results We identified 29 species belonging to two families: Cyclopidae (21 species) and Diaptomidae (eight species). On contrary of our first hypothesis, ANOVA results showed a significant decrease in copepod abundance in the downstream direction. Similarly, the tributaries showed higher values of ecological attributes in the upstream stretch. RDA results showed that in axis 1, the Paraná River and the lakes were positively correlated with conductivity, pH, temperature and suspended organic matter, characterized by the most abundant copepod species. The tributaries, on the other hand, were negatively correlated with turbidity, total nitrogen, total phosphorus and depth. Axis 2 showed a positive correlation of the Paraná River with conductivity and suspended organic matter, and a higher abundance of Argyrodiaptomus azevedoi, Notodiaptomus iheringi, N. henseni, N. cearensis and N. cf. spinuliferus. On the other hand, the lakes were positively correlated with temperature and pH and also with a higher abundance of Thermocyclops minutus and T. decipiens. Conclusion We highlight the importance of the maintenance of the ecological integrity of the Upper Paraná River floodplain, especially of its tributaries, in order to support the high biodiversity registered in the last undammed stretch. Furthermore, we highlight the importance of manipulation of water levels in reservoirs located upstream of this stretch, a necessary condition to maintain the hydrological connectivity between floodplain habitats and the main river.

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