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

Villar, Carlos; Tudino, Mabel Beatríz; Bonetto, Carlos Alberto; Cabo, Laura de; Stripeikis, Jorge; d'Huicque, L.; Troccoli, Osvaldo E.

doi:10.1080/03680770.1995.11900861

Cited by 17 publications

(20 citation statements)

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“…This reported value is also higher than those reported for other coastal zones of Argentina (i.e. 12 µg L -1 for Río de la Plata, Villar et al, 1999;and 4.65 µg L -1 for Bahía Blanca Estuary, Ferrer et al, 2003). It is therefore important to further the studies related to other aspects, such as moult, bioaccumulation and/or antioxidant defence responses of such a high heavy metal presence in the coastal zone of the Beagle Channel.…”

Section: Discussionmentioning

confidence: 56%

Effects of copper on the physiological responses of the commercial crab <i>Lithodes santolla</i> (Decapoda: Anomura) larvae

Amin¹,

Comoglio²

2010

Sci. Mar.

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SUMMARY: Effects of copper toxicity on zoea I of Lithodes santolla (Decapoda: Anomura) were analysed. The 96-h LC 50 was estimated, resulting in 298.5 µg L -1 . Groups of larvae were exposed to sublethal concentrations (40, 80 and 160 µg L -1 ) for 96 h. Oxygen consumption, ammonia excretion, O:N atomic ratio, lipid peroxidation (LPO) and body water content were measured. Oxygen consumption of treated groups (mean 46.92 ± 8.03 µg-atom O 2 h -1 mg -1 ) did not differ significantly with control. Ammonia excretion decreased by 60% at higher Cu concentration (1.61 ± 0.65 µg-atom N-NH 3 h -1 mg -1 ), leading to a 117% increase in the O:N ratio. LPO values during the exposure time were higher in all treatments than in the controls. The water content was significantly higher in treatments than in controls. The highest concentration assayed, which represents about 50% of 96-h LC 50 , had evident effects on the parameters analysed. The values of copper in water reported for the coastal zone of Ushuaia bay exceed the value established by the United States Environmental Protection Agency (USEPA) for ambient water quality criteria. Therefore, the results obtained in the present study are a contribution to the study of potential effects of copper as a common stressor in the first larval stage of this commercial species of the Beagle Channel.Keywords: crustacean larvae, oxygen consumption, ammonia excretion, O:N atomic ratio, lipid peroxidation, copper. RESUMEN: Impacto del cobre sobre las respuestas fisiológicas de la larva del cangrejo comercial Lithodes santoLLa (Decápoda: Anomura). -Los efectos de la toxicidad del cobre sobre la zoea I de Lithodes santolla (Decapoda: Anomura) fueron analizados. La CL50 96-h fue estimada en 298,5 µg L -1 . Grupos de larvas fueron expuestos a concentraciones subletales (40; 80 y 160 µg L -1 ) durante 96 horas. El consumo de oxígeno, excreción de amonio, relación atómica O:N, lipoperoxidación (LPO) y contenido de agua corporal fueron medidos. El consumo de oxígeno de los grupos tratados (media 46.92 ± 8.03 µg-átomo O 2 h -1 mg -1 ) no difirió significativamente del control. La excreción de amonio disminuyó un 60% en la mayor concentración de Cu (1.61 ± 0.65 µg-átomo N-NH 3 h -1 mg -1 ) produciendo un incremento del 117% en la tasa O:N. Los valores de LPO a lo largo de la exposición fueron mayores en todos los tratamientos respecto al control. El contenido de agua corporal fue mayor en los tratamientos que en el control. La mayor concentración ensayada, que representa alrededor del 50% de la CL50 96-h estimada produjo efectos evidentes sobre los parámetros analizados. Los valores de cobre en agua reportados para la zona costera de bahía Ushuaia exceden los establecidos por la Agencia de Protección Ambiental de Estados Unidos (USEPA) como criterio de calidad ambiental. Por esta razón, los resultados obtenidos en el presente estudio se convierten en una contribución sobre el impacto potencial del cobre como un estresor común durante el primer estadio larval de esta importante especie comercial ...

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Section: Discussionmentioning

confidence: 56%

Effects of copper on the physiological responses of the commercial crab <i>Lithodes santolla</i> (Decapoda: Anomura) larvae

Amin¹,

Comoglio²

2010

Sci. Mar.

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“…In urbanized stretches of the Río de la Plata high densities of L. fortunei occur in areas polluted with raw sewage and runoff from storm water outlets (Boltovskoy et al 2006). Near urban centers along the lower Paraná delta where Limnoperna thrives, waters and sediments contain many pollutants (e.g., Zn, Cr, Cu, benzo(a)pyrene, PCBs) at concentrations several times above those considered hazardous for aquatic life (Topalian et al 1990;Villar et al 1998;Cataldo et al 2001a). Bioassays with juvenile C. fluminea indicate that these waters, pore waters and sediments are unsuitable for the survival of this bivalve ( ‡75% mortality in 144 h of exposure; Cataldo et al 2001a, b).…”

Section: Limnoperna Fortuneimentioning

confidence: 98%

Changes in Global Economies and Trade: the Potential Spread of Exotic Freshwater Bivalves

Karatayev

Padilla

Minchin³

et al. 2006

Biol Invasions

215

142

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The globalization of economies and trade have facilitated the spread of exotic species including the five most important freshwater suspension feeding invaders Dreissena polymorpha, D. bugensis, Corbicula fluminea, C. fluminalis, and Limnoperna fortunei. We suggest that the spread of these exotic species has not been a continuous process, but rather punctuated by periods of rapid long distance spread (jump), during which species greatly expanded their geographic ranges. Each jump has been associated with changes in the tempo of some human activity, such as the construction of shipping canals for trade, building of reservoirs for water storage and power production, political boundary changes or changes in political systems, which affected the position or permeability of national borders, human migration, changes in the mode and volume of international trade, or recent industrial practices and environmental laws. We hypothesize that the rate of spread of exotic species depends on the spatial scale of spread and may be accelerated or slowed by various human activities. In general, aquatic exotic species may quickly spread along connected waterways in a new continent they invade and soon reach their maximum range (continental scale). However, it will take much longer to colonize all isolated regions (regional scale) and longer still to spread to all isolated lakes and river systems (local scale). The difference in the rate of colonization across scales may be several orders of magnitude.

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“…Aquatic macrophytes accumulate Hg with high concentration factors relative to the Hg concentrations present in water, thus affecting the distribution of this metal among the different compartments of aquatic systems (Lacerda et al, 1991;Dushenko et al, 1995;Villar et al, 1999). Also, macrophyte rhizospheres are important sites of Hg methylation in tropical freshwater ecosystems (Guimarães et al, 1998;2002), acting as a potential Hg source for herbivorous organisms and enhancing Hg transfer along food chains (Suarez et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

et al. 2006

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This paper reports on a study to determine the Hg content in the five most abundant aquatic macrophyte species (Elodea densa, Sagittaria montevidensis, Salvinia auriculata, Pistia stratiotes and Eichhornia crassipes) in two artificial reservoirs flooded by water diverted from the Paraíba do Sul river, SE Brazil. The potential of these species for Hg accumulation and their role in Hg transport along the river system due to macrophyte management were evaluated. Mercury concentrations were higher in free-floating than in rooted species. Roots were also richer in Hg than were leaves. Dry weight Hg concentrations in leaves and roots from all species varied from 46-246 ng.g -1 to 37-314 ng.g -1 , respectively. These values are higher than those reported for uncontaminated lakes in Brazil and in other tropical areas and similar to those reported for moderately contaminated sites. Mercury concentrations can be attributed to fluvial transport from the heavily industrialized Paraíba do Sul river basin. Intensive sampling of Pistia stratiotes from two sites in the Vigário reservoir was performed to evaluate the capacity of Hg incorporation in short periods of time. The results showed a significant negative correlation between Hg content and size class of individual plants, demonstrating the importance of juveniles, fast growing plants in absorbing Hg. The foremost impact related to Hg contents in the studied area concerns the periodic removal of macrophytes for reservoir management, followed by disposal in nearby areas. This results in the mobilization of 0.52 to 1.3 Kg of Hg per year, a significant fraction of the Hg burden present in reservoir waters. Disposal of such material may result in Hg leaching to river systems, affecting the Hg transfer throughout the basin.Keywords: mercury, aquatic macrophytes, artificial reservoirs. RESUMO

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

Cited by 17 publications

References 1 publication

Effects of copper on the physiological responses of the commercial crab <i>Lithodes santolla</i> (Decapoda: Anomura) larvae

Effects of copper on the physiological responses of the commercial crab <i>Lithodes santolla</i> (Decapoda: Anomura) larvae

Changes in Global Economies and Trade: the Potential Spread of Exotic Freshwater Bivalves

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

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