The role of hydrodynamic fluctuations and wind intensity on the distribution of plastic debris on the sandy beaches of Paraná River, Argentina

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

Neotropical Ichthyology ◽

10.1590/s1679-62252011005000021 ◽

2011 ◽

Vol 9 (2) ◽

pp. 403-409 ◽

Cited By ~ 20

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.

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Miniatures as Ritual Objects: Exploring the Role of Small-Sized Vessels among the Complex Late Holocene Hunter-Gatherers from the Paraná River Lowlands in South America

Cambridge Archaeological Journal ◽

10.1017/s0959774319000726 ◽

2020 ◽

Vol 30 (3) ◽

pp. 433-450

Author(s):

Flavia Ottalagano

Keyword(s):

South America ◽

Late Holocene ◽

Systematic Approach ◽

Paraná River ◽

Archaeological Sites ◽

Hunter Gatherers ◽

Parana River ◽

Data Errors ◽

Northeastern Argentina

This study is the first systematic approach to ceramic miniatures from the lowlands of the Paraná River (northeastern Argentina), which have received marginal attention from regional archaeology. This paper presents an analysis of 24 pottery miniatures recovered from archaeological sites generated by complex Late Holocene hunter-gatherers, dating from between 460±50 and 1056±47 years bp. Morphological and decorative data, errors of manufacture, traces of use and the context of the pieces’ deposition are recorded in order to explore aspects of their variability and functionality. The miniatures correspond to bowls, basins, cups and ‘bell’ artefacts, all of which are commonly found in the regional record. The data obtained suggest that at least some of the sample were used in the symbolic sphere, such as burial offerings.

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Activity and habitat use of two species of stingrays (Myliobatiformes: Potamotrygonidae) in the upper Paraná River basin, Southeastern Brazil

Neotropical Ichthyology ◽

10.1590/s1679-62252012000100008 ◽

2012 ◽

Vol 10 (1) ◽

pp. 81-88 ◽

Cited By ~ 14

Author(s):

Domingos Garrone Neto ◽

Virgínia Sanches Uieda

Keyword(s):

Habitat Use ◽

River Basin ◽

Habitat Diversity ◽

Sandy Beaches ◽

Paraná River ◽

Southeastern Brazil ◽

Parana River ◽

Upper Paraná River ◽

Upper Paraná River Basin ◽

Paraná River Basin

The life history of freshwater stingrays (Potamotrygonidae) under natural conditions has been poorly documented. In this study, we investigated theperiod of activity and the habitat use of two species of the genus Potamotrygon in the upper Paraná River basin, Southeastern Brazil. Potamotrygon falkneri and P. motoro are similar to each other as far as the analyzed behavior is concerned. Individuals of both species segregate according to their size, and in function of the depth and period of the day. Younger individuals inhabit mostly sandy beaches and places that are no deeper than four meters throughout the whole day. Bigger stingrays realize bathymetric migrations, alternating their position between places deeper than eight meters during the day, and shallow areas at night. Individuals of intermediate size inhabit transition environments that have greater habitat diversity. Both species presented mostly nocturnal habits, especially regarding their feeding behavior. The behavioral patterns observed seem to go through ontogenetic variations and probably change throughout the year, between dry and wet seasons.

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