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 Invasive non-native species of fish in upper Paraná river Basin, Brazil: variations of caloric content in Cichla kelberi

2012 ◽  
Vol 10 (2) ◽  
pp. 401-408 ◽  
Author(s):  
Luis Alberto Espínola ◽  
Horácio Ferreira Júlio Junior ◽  
Evanilde Benedito
Keyword(s):  
Native Species ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Paraná River ◽  
Caloric Content ◽  
Fish Food ◽  
Gonadal Maturation ◽  
Parana River ◽  
Upper Paraná River

The allocation of assimilated energy may be influenced by seasonal changes, growth, and reproductive cycle of fish, food consumption and environmental conditions. The objective of this research was to evaluate the energetic variations of Cichla kelberi in the upper Paraná River floodplain, analyzing the caloric content in muscles, gonadosomatic index (GSI), and the condition factor between assessed systems, sex, and stage of gonadal maturation. The results obtained in the present study permit assuring that this is a species that efficiently converts the resources of the environment into energy. Although presenting higher condition factor in the environment where there is a greater ease in getting food (Paraná subsystem), the energy identified in the muscles was the same in both subsystems. During the process of gonadal maturation there is optimization in energy accumulation in the muscles of females, before and after reproductive period, and somatic growth occurs significantly when the individual is not reproducing. Further detailed studies on ecological mechanisms influencing the success of the species, as the presence of competitors and preference for native preys, are needed to implement effective management measures aimed at preventing that the species proliferation in the environment is even more damaging to local biodiversity.

scholarly journals Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain

2003 ◽  
Vol 63 (2) ◽  
pp. 177-182 ◽  
Author(s):  
C. S. Agostinho ◽  
N. S. Hahn ◽  
E. E. Marques
Keyword(s):  
Resource Use ◽  
Native Species ◽  
Feeding Strategy ◽  
Food Resource ◽  
Paraná River ◽  
Activity Period ◽  
Parana River ◽  
Invading Species ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River

Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

scholarly journals GÊNESE DE BARRAS DE SOLDAMENTO E SUAS CARACTERÍSTICAS MORFOLÓGICAS: ALTO RIO PARANÁ, BRASIL / Attachment Bars Genesis and Morphological Features: Upper Paraná River, Brazil

2016 ◽  
Vol 2 (1) ◽  
pp. 127
Author(s):  
Vanessa Cristina Dos Santos ◽  
José Cândido Stevaux
Keyword(s):  
Water Level ◽  
Energy Flow ◽  
High Water ◽  
Morphological Characterization ◽  
Paraná River ◽  
Secondary Channel ◽  
Parana River ◽  
Average Water ◽  
Upper Paraná River

O rio Paraná, em seu trecho natural, é caracterizado por canais secundários de diferentes ordens de tamanho, separando diversas ilhas e barras fluviais. As barras fluviais apresentam grande porte e suas formas mudam constantemente conforme a magnitude do fluxo. Este estudo apresenta a caracterização morfológica de uma barra de soldamento e suas adjacências, situadas junto à ilha Santa Rosa, no alto rio Paraná. Para tanto, a morfologia da barra foi comparada em dois momentos hidrológicos distintos através de levantamentos com aparelho de batimetria. Os resultados evidenciam que a morfologia da barra estudada está diretamente influenciada pelas oscilações da vazão do rio Paraná. No período de águas altas há maior retrabalhamento da forma, e preservação parcial em período de águas médias. A análise da distribuição das formas adjacentes à barra de soldamento permitiu constatar que o canal principal possui mais energia, já que apresenta formas íngremes e profundas, e o canal secundário indica menor energia de fluxo por apresentar formas mais suaves.AbstractThe Paraná River, in its natural reach is characterized by secondary channels of different size orders, which separates several islands and bars. Fluvial bars are large and their forms change constantly due to the flow. This study presents the morphological characterization of an attachment bar and its adjacencies, located nearby the island Santa Rosa, in the upper Paraná River. Therefore, the morphology of the bar was compared in two distinct hydrological moments through surveys with bathymetry equipment. The results indication that the morphology of the studied bar is directly influenced by fluctuations in the flow of the Paraná River. In the period of high water level there is more reworking of the forms and partial preservation in average water level. The analysis of the distribution of forms adjacent to the attachment bar allowed establishing that the main channel is more energetic, as it presents abrupt and deep forms and the secondary channel indicates lower energy flow by presenting smoother forms.Keywords:Paraná River, Fluvial Geomorphology, Morphology, Attachment Bar

scholarly journals Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain

2013 ◽  
Vol 11 (2) ◽  
pp. 413-424 ◽  
Author(s):  
Ana Cristina Petry ◽  
Fabiane Abujanra ◽  
Luiz Carlos Gomes ◽  
Horacio Ferreira Julio Jr. ◽  
Angelo Antonio Agostinho
Keyword(s):  
Dissolved Oxygen ◽  
Fish Assemblages ◽  
High Water ◽  
Flood Pulse ◽  
Paraná River ◽  
Tropical Fish ◽  
Hypoxia Tolerance ◽  
Interannual Variations ◽  
Parana River ◽  
Upper Paraná River

The effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period from 2000 to 2003. There were overall reductions in dissolved oxygen levels and increases in transparency of water in lakes in years of moderate floods. The duration of floods influenced species differentially based on their tolerance to hypoxia: in moderate floods, richness of STH increased and numerical abundance and biomass of SIH reduced significantly. Opposite relationships were detected between dissolved oxygen and the attributes of STH and SIH. Dissolved oxygen was the best predictor of variability of STH and SIH in years of moderate floods, whereas water transparency predicted significant amounts of STH in years of short floods. Being positively affected by dissolved oxygen reductions, STH seem to take advantages in persisting in seasonally harsh lentic habitats. The incorporation of abiotic data as well the differential tolerance of species to hypoxia would improve further investigations of the effects of interannual variations in the flood pulse on tropical fish assemblages

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.

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 Characterization of habitats based on algal periphyton biomass in the upper Paraná River floodplain, Brazil

2008 ◽  
Vol 68 (3) ◽  
pp. 503-509 ◽  
Author(s):  
JA. Leandrini ◽  
IA. Fonseca ◽  
L. Rodrigues
Keyword(s):  
Hydrological Regime ◽  
High Water ◽  
Paraná River ◽  
River Floodplain ◽  
Parana River ◽  
Relevant Role ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Periphyton Biomass ◽  
Paraná River Floodplain

Considering the relevant role played by the hydrological regime on the structure and functioning of floodplains, this study aims at characterizing different types of aquatic environments according to periphyton biomass and evaluating the influence of the fluviometric levels of the Paraná River and other forcing functions upon the periphytic community. Periphyton (chlorophyll a) was analyzed in 28 habitats, during the years 2000 and 2001, in high and low water seasons. Both years were characterized by lacking the characteristic high water season. The Principal Components Analysis revealed two groups. The first component was positively associated with hydrometric level, electric conductivity, pH and transparency, and negatively with total nitrogen and total phosphorus, dissolved organic carbon and turbidity. The second component separated the habitats of Paraná River in the period of low waters from other environments, mainly for hydrometric level and high transparency values. Periphytic biomass of the habitats demonstrated that the maintenance of the functional integrity of the Upper Paraná River floodplain is closely related to its hydrologic cycle.

scholarly journals The more stirring the better: cichlid fishes associate with foraging potamotrygonid rays

2009 ◽  
Vol 7 (3) ◽  
pp. 499-501 ◽  
Author(s):  
Domingos Garrone-Neto ◽  
Ivan Sazima
Keyword(s):  
Native Species ◽  
Paraná River ◽  
Cichlid Species ◽  
Cichlid Fishes ◽  
Parana River ◽  
Upper Paraná River

One hunting tactic of freshwater rays (Potamotrygonidae), termed "undulate the disc and stir substrate", is here reported to attract cichlids at two sites in the upper Paraná River. The ray species involved in such association are Potamotrygon falkneri and P. motoro, whose activity attract four cichlid species, namely Crenicichla britskii, Satanoperca pappaterra, Cichla kelberi, and Geophagus proximus, the two latter non-native species to the study area. The cichlids approach a ray when it begins to stir the substrate and form sediment clouds, and remain close to the ray during this activity only. The association is here regarded as following behavior even if very transient.

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