Resource use in the Parana River Delta (Argentina): moving away from an ecohydrological approach?

Baigún, Claudio Rafael Mariano; Puig, Alba; Minotti, Priscilla Gail; Kandus, Patricia; Quintana, Rubén D.; Vicari, Ricardo; Bó, Roberto Fabián; Oldani, Norberto Oscar; Nestler, John

doi:10.2478/v10104-009-0019-7

Cited by 74 publications

(52 citation statements)

References 36 publications

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“…This region includes an extensive complex floodplain, with main and secondary river channels connected to numerous shallow lakes, where 8,000 km 2 can be considered as available for fishing during hydrological conditions characterized by average yearly floods. The main hydrological and geomorphological features were described by Baigún et al (2008) for the Delta and by Drago (2007) provided by the SENASA (National Service of Animal Health, Argentina). Based on local authorities and fishery biologist estimations, we considered an average catch of 5,000 tons per year, which corresponds to local consumption and local market sales.…”

Section: Methodsmentioning

confidence: 99%

“…Baigún et al (2008), for example, emphasized the need to protect the hatching and growth areas in the alluvial valleys and highlighted the importance of maintaining appropriate levels of detritivorous species. Such species are a characteristic and salient feature of Neotropical rivers and contribute to nutrient recycling and the regulation of carbon transport in rivers (Winemiller et al, 2006;Taylor, 2006), thus the stock composition and abundance of those species can serve as valuable indicators of ecosystem health.…”

Section: Management Caveatsmentioning

confidence: 99%

“…The sábalo -a species that represented up to 60% of the fish biomass in the floodplain lagoons (Bonetto et al, 1970;Tablado et al, 1988) -is by far the main target (Quirós & Cuch, 1989;Baigún et al, 2008). During the last decade, however, the problems of the fisheries have been exacerbated as a result of the installation of several cold storage plants, after 2001, for commercial fishery development so as to promote changes in the exploitation patterns and resource uses.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators

Baigún

Minotti

Oldani³

2013

Neotrop. ichthyol.

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This study assesses the change in fish exploitation patterns of the sábalo fisheries of the lower Paraná River basin based on hydrological, biological, and fishery indicators. From historical catch records, we recorded a shift from a lightly and moderate exploited status before 2001 to a heavily exploited one, as a result of the development of sábalo exports from 2001 onwards.Channel and floodplain connectivity indices demonstrated that the Paraná exhibited highly favorable hydrological conditions between 1972 and 1999 but more adverse conditions from 1999 to 2009, as a consequence of flood pulses reduction coincident with a fishing mortality increment. A total catch of 15,000 tons, including local consumption, regional market, informal sales, and exportation volumes, was estimated as the maximum sustainable catch. That level was instead exceeded 3 fold in 2004, in parallel with a decrease in the mean fish length from 48 to 42 cm, along with a reduction in both the mesh size from 16 to 12 cm and megaspawner proportion, and an increase of fishing mortality. Although growth overfishing was not noted, an analysis of the spawning potential ratio trend indicated that recruitment overfishing took place during 2005, since the fishing mortality rate was 4 times greater than the natural mortality rate. These observations suggest that less favorable hydrological conditions after 1999 coupled with a coincident high fishing pressure could have impacted the sábalo population biomass. Management of sábalo fisheries requires to set aside a single economic vision of the resource use moving to an ecosystem-oriented approach that incorporate, among others components, the hydrological regime, species life history traits, fishing impacts on other species, and main stakeholders socioeconomic requirements as key elements for the preservation of fishery sustainability.Este estudio evalúa el cambio en los patrones de explotación de las pesquerías de sábalo (Prochilodus lineatus) en la baja cuenca del río Paraná basado en indicadores hidrológicos, biológicos y pesqueros. A partir de registros históricos de capturas se notó un desplazamiento de un estado de explotación ligera o moderada previa a 2001 a otro de explotación intensiva como resultado del desarrollo de una pesquería para exportación a partir de ese año. Los índices de conectividad hidrológica demostraron que el Paraná exhibió condiciones muy favorables para el sábalo entre 1972 y 1999, pero más adversas entre 1999 y 2009 al reducirse el caudal, que coincidió con un aumento en la mortalidad por pesca. Se estimó en 15.000 toneladas la captura máxima sostenible, incluyendo tanto la destinada al consumo local, venta informal y en mercados regionales, como la asignada a exportación. Este nivel, sin embargo, se triplicó en 2004, siendo acompañado por una disminución de la talla media y máxima de captura de 48 a 42 cm y de 64 a 58 cm respectivamente, una reducción de abertura de malla de 16 a 12 cm y un descenso en la proporción de megareproductores. Aun cuando no se detectó sobrepe...

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Section: Methodsmentioning

confidence: 99%

Section: Management Caveatsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators

Baigún

Minotti

Oldani³

2013

Neotrop. ichthyol.

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“…Summaries exist, for instance, for the wetlands of Bolivia (Navarro and Maldonado 2002), Mamoré (Pouilly et al 2004), Patagonia (Collantes and Faggi 1999;Blanco and Balze 2004), the Orinoco River (Vasquez 1989;Weibezahn et al 1990;Lewis et al , 2000, Argentina (Malvárez and Bó 2004;Kandus et al 2008;Baigún et al 2008;Neiff 2001;Canevari et al 1999), the Amazon region (Sioli 1984;Salo et al 1986;Junk 1997a;Junk et al 2000Junk et al , 2010Padoch et al 1999;Kalliola et al 1993;Goulding 1980;Goulding et al1988Goulding et al , 1996Smith 1999;Melack and Forsberg 2001;Melack et al 2009), the Pantanal (Heckman 1998;Junk et al 2011a), the Paraná River floodplain (Paoli and Schreider 2000;Thomaz et al 2004;Iriondo et al 2007), and the ephemeral wetlands in South America (summarized in Deil 2005).…”

Section: Current Knowledge and Research Effortsmentioning

confidence: 99%

Current state of knowledge regarding South America wetlands and their future under global climate change

2012

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“…These ecosystems feature high biodiversity and are important for society due to flood regulation, habitat provision for fish and wildlife, natural forage provision for cattle, and carbon sequestering, among other factors [2,3]. Floodplain wetlands have been mapped and monitored with optic data in several opportunities (e.g., [4][5][6]).…”

Section: Introductionmentioning

confidence: 99%

Mapping Plant Functional Types in Floodplain Wetlands: An Analysis of C-Band Polarimetric SAR Data from RADARSAT-2

et al. 2016

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Abstract:The inclusion of functional approaches on wetland characterizations and on biodiversity assessments improves our understanding of ecosystem functioning. In the Lower Paraná River floodplain, we assessed the ability of C-band polarimetric SAR data of contrasting incidence angles to discriminate wetland areas dominated by different plant functional types (PFTs). Unsupervised H/α and H/A/α Wishart classifications were implemented on two RADARSAT-2 images differing in their incidence angles (FQ24 and FQ08). Obtained classes were assigned to the information classes (open water, bare soil and PFTs) by a priori labeling criteria that involved the expected interaction mechanisms between SAR signal and PFTs as well as the relative values of H and α. The product obtained with the shallow incidence angle scene had a higher accuracy than the one obtained with the steep incidence angle product (61.5% vs. 46.2%). We show how a systematic analysis of the H/A/α space can be used to improve the knowledge about the radar polarimetric response of herbaceous vegetation. The map obtained provides novel ecologically relevant information about plant strategies dominating the floodplain. Since the obtained classes can be interpreted in terms of their functional features, the approach is a valuable tool for predicting vegetation response to floods, anthropic impacts and climate change.

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Resource use in the Parana River Delta (Argentina): moving away from an ecohydrological approach?

Cited by 74 publications

References 36 publications

Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators

Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators

Current state of knowledge regarding South America wetlands and their future under global climate change

Mapping Plant Functional Types in Floodplain Wetlands: An Analysis of C-Band Polarimetric SAR Data from RADARSAT-2

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