scholarly journals Long-term trends of fishery landings and target fish populations in the lower La Plata basin

2021 ◽  
Vol 19 (3) ◽  
Author(s):  
Pablo A. Scarabotti ◽  
Luis O. Lucifora ◽  
Luis A. Espínola ◽  
Ana P. Rabuffetti ◽  
Jorge Liotta ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Ecosystem Approach ◽  
Paraná River ◽  
Population Trends ◽  
Fish Populations ◽  
Data Sets ◽  
La Plata ◽  
Parana River ◽  
La Plata Basin ◽  
Target Fish

Abstract The La Plata basin is the second largest basin of South America and has supported important river fisheries for more than a century. In this paper, we evaluate for the first time the historical trends of landings of 21 fish taxa and the recent population trends of 27 species of commercial fishes in the lower La Plata basin (Argentina). We compiled three kinds of data sets: Total fishery landings (between 1934 and 1986) and exports (1994‒2019), fisheries monitoring programs of Chaco and Santa Fe provinces in the Paraná River (2009‒2019), and surveys of fish populations in the Upper (Corrientes, 1993‒2020) and Middle (EBIPES, 2005‒2020) Paraná River. The analysis of the historical landings showed more species declining in the lower portion of the basin than in the upper basin. Regarding recent population trends, Pimelodus spp., Hoplias spp., Salminus brasiliensis, Luciopimelodus pati, and Ageneiosus spp. declined in more than one region, while Megaleporinus spp., Pterodoras granulosus, and Oxydoras kneri showed stable to positive trends, with the other species varying in their trends between regions. These tendencies could be associated to a combination of factors such as overfishing and environmental changes that would require an ecosystem approach for their adequate management.

Persistence of fish populations in the upper Paraná River: effects of water regulation by dams

2007 ◽  
Vol 16 (2) ◽  
pp. 191-197 ◽  
Author(s):  
É. A. Gubiani ◽  
L. C. Gomes ◽  
A. A. Agostinho ◽  
E. K. Okada
Keyword(s):  
Paraná River ◽  
Fish Populations ◽  
Water Regulation ◽  
Parana River ◽  
Upper Paraná River

Geographic distribution of the short-tailed river stingray (Potamotrygon brachyura): assessing habitat loss and fishing as threats to the world’s largest obligate freshwater elasmobranch

2016 ◽  
Vol 67 (10) ◽  
pp. 1463 ◽  
Author(s):  
Luis O. Lucifora ◽  
Santiago A. Barbini ◽  
Sabina Llamazares Vegh ◽  
Pablo A. Scarabotti ◽  
Facundo Vargas ◽  
...  
Keyword(s):  
Water Temperature ◽  
Geographic Distribution ◽  
River Basins ◽  
Paraná River ◽  
Habitat Modification ◽  
Rio De La Plata ◽  
Fishing Pressure ◽  
Río De La Plata ◽  
La Plata ◽  
Parana River

Freshwater elasmobranchs are threatened but little is known about them. Potamotrygon brachyura is the world’s largest obligate freshwater elasmobranch. This makes it popular among fishermen and suggests a susceptibility to anthropogenic threats. We collected records of P. brachyura (n=70) from media, fishermen and scientific sampling, to estimate its global geographic distribution (using both generalised additive and MaxLike models). Then, we estimated the species’ exposure to habitat modification and fishing pressure, by applying multinomial ordinal models with threat levels as response and the presence or absence of P. brachyura as an independent variable. Distance to coast, depth, water temperature range, salinity range and mean water temperature were the main determinants of the distribution in the Río de la Plata. This resulted in a narrow coastal distribution. In the Uruguay and Paraná River basins, the probability of occurrence was positively associated with flow accumulation, percentage of open water and submerged vegetation, and lowland ecoregions, and negatively to wetness index and altitude. This limited the distribution to large lowland rivers. Approximately 41% of the range of P. brachyura in the Río de la Plata was subject to high habitat modification. In the Uruguay and Paraná River basins, this percentage reached 7%; however, the overlap with high fishing pressure was 59%. For conservation purposes, P. brachyura may function as an umbrella species.

scholarly journals Pre-Hispanic settlements in hydrometeorologically susceptible areas during the late Holocene: The Upper Delta of the Paraná River Case

The Holocene ◽  
2017 ◽  
Vol 27 (12) ◽  
pp. 1801-1811 ◽  
Author(s):  
Carola Castiñeira Latorre ◽  
Eduardo Apolinaire ◽  
Adriana M Blasi ◽  
Mariano Bonomo ◽  
Gustavo Politis ◽  
...  
Keyword(s):  
South America ◽  
Late Holocene ◽  
Paraná River ◽  
Resource Exploitation ◽  
Southern South America ◽  
Settlement Systems ◽  
Parana River ◽  
La Plata Basin ◽  
Human Colonization ◽  
Residential Camps

In this paper, we present the results of the geoarchaeological studies carried out in two archaeological localities of the Upper Delta of the Paraná River (Argentina). The main objective of these studies is to depict the pre-Hispanic strategies involved in the colonization and settlement of southern South America wetlands. Paraná Delta is one of the most conspicuous areas of these lowlands and comprises a large wetland macrosystem. Its current geomorphological configuration was established after the last transgressive mid-Holocene event c. 6000 14C yr BP. In this environment, a high ecological heterogeneity, with diverse and abundant tropical and temperate biota, was developed. These features were important factors to the human colonization and utilization of these wetlands. However, this environment has the highest hydrometeorological susceptibility of La Plata basin. This susceptibility had an impact on settlement systems and resource exploitation strategies established in the area since at least 2000 14C yr BP. These strategies involved at least two settlement types: semi-permanent residential camps and transitory camps oriented to exploit particular resources. The semi-permanent settlements were located in anthropogenic elevated mounds, locally known as ‘cerritos’, and were not subjected to seasonal inundations. Conversely, the transitory camps are found in levees exposed to recurrent flooding.

scholarly journals Periphytic algae of the Garças Lake, Upper Paraná River floodplain: comparing the years 1994 and 2004

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 459-468 ◽  
Author(s):  
EA. Murakami ◽  
DC. Bicudo ◽  
L. Rodrigues
Keyword(s):  
Environmental Changes ◽  
Hydrological Regime ◽  
Paraná River ◽  
Nutrient Concentrations ◽  
River Floodplain ◽  
Periphytic Algae ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain

The changes imposed by dams on hydrological regime, water transparence and nutrient concentrations downstream affect biodiversity in relation to species richness and specific composition of the community. The aim of this work was evaluate this effect on periphyton, comparing richness and composition of periphytic algae in the Garças Lake, Upper Paraná River floodplain, between the years 1994, before construction of the Porto Primavera Reservoir, and after its operation in 2004. This floodplain lake showed an increase in species, from 113 in 1994 to 159 in 2004. A few species, however, were common during the last year, dominated by Zygnemaphyceae and some Bacillariophyceae species. The increase in algal diversity in 2004 may be the result of the ability of the system to adapt to environmental changes. However, the large change in the periphyton species composition suggests further impacts on the food web, demanding continuity of long-term studies in order to determine their consequences on the biodiversity as a whole.

Fish populations of lentic environments of the Paraná River

Hydrobiologia ◽  
1992 ◽  
Vol 237 (3) ◽  
pp. 159-173 ◽  
Author(s):  
Elly de Yuan Cordiviola
Keyword(s):  
Paraná River ◽  
Fish Populations ◽  
Parana River

scholarly journals Environmental changes and human work in the region of the Upper Paraná River floodplain: processes and interactions

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 583-589 ◽  
Author(s):  
EA. Tomanik ◽  
LM. Paiola ◽  
JB. Martínez-Fernández ◽  
SL. Fernandes
Keyword(s):  
Environmental Changes ◽  
Work Relationships ◽  
Paraná River ◽  
River Floodplain ◽  
Parana River ◽  
Two Factors ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain ◽  
Working And Living Conditions

The environment and society constitute a complex of elements and interactions. Thus, an understanding of the processes in which the environment and psychosocial elements are involved may not be gained from knowledge of just one isolated variable. Based on such premises, the present paper, which summarizes the results of a series of studies, adopts work relationships as its main focus, but in addition, it has two complementary objectives. One is to present some analyses on the interaction between human actions and the environmental changes that have been taking place in the region of the Upper Paraná River floodplain and in its boundaries. A secondary aim is to show how those two factors have been changing people's working and living conditions and the identity configuration of some of the human groups that live at that site.

scholarly journals Use of otolith strontium : calcium ratio as an indicator of seasonal displacements of the silverside (Odontesthes bonariensis) in a freshwater–marine environment

2013 ◽  
Vol 64 (8) ◽  
pp. 746 ◽  
Author(s):  
E. Avigliano ◽  
A. V. Volpedo
Keyword(s):  
Marine Environment ◽  
Calibration Curve ◽  
Paraná River ◽  
River Delta ◽  
Water Bodies ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Parana River ◽  
Odontesthes Bonariensis

Strontium : calcium (Sr : Ca) ratios were measured in sagittal otoliths of silverside (Odontesthes bonariensis) from a freshwater–marine environment (Paraná River Delta and Río de la Plata River, South America) in order to understand its seasonal movements. Conductivity was recorded and the water Sr : Ca ratio was determined by inductively coupled plasma–atomic emission spectrometry (ICP-OES). A calibration curve of water Sr : Ca ratio versus otolith Sr : Ca ratio from four isolated lentic water bodies was made to predict silverside displacements in the lower section of the Plata Basin during summer (lotic water bodies). Otolith Sr : Ca ratio of silversides from the Paraná River Delta was associated with the conductivity of water at the locations where the sample was collected. According to this association and the obtained results in the calibration curve, the silversides were displaced from zones where conductivity was 7.45 (mS cm–1), corresponding to the water Sr : Ca ratio in the outer section of the Río de la Plata River (1.92 mmol mol–1). The high values of otolith Sr : Ca ratio found for some fish may indicate that during summer they moved from estuarine waters where salinity increases gradually to the Argentinian Sea.

Heavy metal concentrations in the Lower Paraná River and right margin of the Río de la Plata Estuary

1998 ◽  
Vol 26 (3) ◽  
pp. 963-966
Author(s):  
C. Villar ◽  
M. Tudino ◽  
C. Bonetto ◽  
L. de Cabo ◽  
J. Stripeikis ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Paraná River ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
La Plata ◽  
Parana River
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