Publications by authors named "H Luis Cappozzo"

20 Publications

Trace elements in subantarctic false killer whale (Pseudorca crassidens) tissues, including the skin as an offshore bioindicator.

Environ Sci Pollut Res Int 2021 Feb 20. Epub 2021 Feb 20.

Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Av. Bustillo, 8500, Bariloche, Argentina.

On a global scale, cetaceans are recognized well indicators of marine ecosystem health. Trace elements accumulate in their bodies and potentially constitute a toxicological threat. Here, the concentrations of essential Se; unknown physiological elements Br, Rb, Cs, Ni, and Sr; and pollutants arsenic, Cd, Hg, and Ag were assessed in the skin of false killer whales (Pseudorca crassidens) stranded at Estrecho de Magallanes, South America, and next, tissue comparisons and relationships between elemental concentrations in the skin and internal tissues (liver, kidney, spleen, lung, skeletal muscle, and testis) were assessed. Results showed elemental concentration variations among tissues. Selenium concentration was found to be higher in the liver 398 (75) μg g dry weight (DW) (standard deviation in parenthesis), followed by skin. Rubidium and Br concentrations were higher in testis 7.92 (0.42) and 99.1 (5.4) μg g DW, respectively, and Cs in muscle 0.36 (0.12) μg g DW, while Ni concentrations range (<0.05-0.91 μg g DW) did not show differences among tissues. Cadmium and arsenic were found to be higher in kidneys, 71.2 (17.6) and 2.54 (1.77) μg g DW, respectively, while Hg was highest in the liver 1068 (234) μg g DW. Concerning inter-tissue relationships, a positive skin-to-kidney and skin-to-muscle correlations were observed for Cs concentrations, and also Hg showed positive skin-to-spleen, skin-to-kidney, and skin-to-testis correlations, which support its use as potential offshore marine biomonitor.
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http://dx.doi.org/10.1007/s11356-021-12890-1DOI Listing
February 2021

Stranded false killer whales, Pseudorca crassidens, in Southern South America reveal potentially dangerous silver concentrations.

Mar Pollut Bull 2019 Aug 3;145:325-333. Epub 2019 Jun 3.

Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Avenida Bustillo 9500, Bariloche, Argentina.

Silver (Ag) is a non-essential metal known to bioaccumulate in aquatic organisms. We determined Ag concentrations in five false killer whales stranded in South America. Silver concentrations (in dry weight basis) range as 6.62-10.78 μg g in liver, 0.008-7.41 μg g in spleen, 0.004-5.71 μg g in testis, 0.757-1.69 μg g in kidney, 0.011-0.078 μg g in lung and < 0.01-0.038 μg g in muscle, whereas in the single samples of uterus and ovary were 0.051 and 0.023 μg g; respectively. Overall, Ag concentration in liver and kidney exceeded the cetacean toxic thresholds, proposed as "unhealthy concentrations" and "critically dangerous" in liver and kidney. These results warrant further eco-toxicological studies, to examine biological effects of elevated silver levels for individuals and to assess the species' conservation status with respect to marine pollution.
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http://dx.doi.org/10.1016/j.marpolbul.2019.05.047DOI Listing
August 2019

High status of mercury and selenium in false killer whales (Pseudorca crassidens, Owen 1846) stranded on Southern South America: A possible toxicological concern?

Chemosphere 2018 May 10;199:637-646. Epub 2018 Feb 10.

Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Av E. Bustillo km 9.500, Bariloche, Argentina.

The study was carried out to determine Hg and Se concentrations in false killer whales stranded on the Estrecho de Magallanes, Chile, South America. Tissue samples of five mature specimens were analyzed (two females and three males). Mean Hg concentration in liver 1068 (234) μg g dry weight (DW) (standard deviation in parenthesis) was markedly higher than those in kidney 272 (152) μg g DW, lung 423 (325) μg g DW, spleen 725 (696) μg g DW, muscle 118 (94) μg g DW and testicle 18.0 (2.8) μg g DW. Mean Se concentration in liver, 398 (75) μg g DW, was higher than those in kidney 162 (69) μg g DW, lung 128 (84) μg g DW, spleen 268 (245) μg g DW, muscle 47 (38) μg g DW and testicle 25.4 (2.1) μg g DW. Positive correlations were found between Hg and Se molar concentrations in muscle, lung, spleen and kidney. Molar ratio of Se/Hg in liver, lung and muscle were <1, but those in kidney and testicle were markedly >1 suggesting a Se protection against Hg toxicity. In all the examined specimens Hg values exceeded the toxic thresholds defined for hepatic damage in marine mammals, with Se/Hg molar ratios below 1 implying limited protective action of Se. Generally, our results showed that individuals are carrying a significant burden, reflecting a high exposure to this toxic metal. This constitutes the first report on Hg and Se levels for a large subantarctic odontocete in South America region, providing insights into their contamination status and with information to the understanding of possible impacts on wild populations.
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http://dx.doi.org/10.1016/j.chemosphere.2018.02.046DOI Listing
May 2018

Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts.

Braz J Biol 2018 May 17;78(2):202-210. Epub 2017 Aug 17.

Laboratorio de Ecología, Comportamiento y Mamíferos Marinos, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Ciudad Autónoma de Buenos Aires, Argentina.

The aim of this study was to analyze the isotopic composition in muscle of striped weakfish Cynoscion guatucupa from Southwest Atlantic Ocean in order to evaluate a possible variation in δ13C and δ15N in response to dietary shifts that occur as animals grow. We also explored for isotopic evidence of differences between sample locations. The results showed an agreement between isotope analysis and previous conventional studies. Differences in the isotope composition between sampling location were not observed. A positive relation exists between isotope values and total body length of the animals. The Cluster analysis defined three groups of size classes, validated by the MDS. Differences in the relative consumption of prey species in each size class were also observed performing isotope mixing models (SIAR). Variation in δ15N among size classes would be associated with the consumption of a different type of prey as animals grow. Small striped weakfish feed on small crustaceans and progressively increase their consumption of fish (anchovy, Engraulis anchoita), increasing by this way their isotope values. On the other hand, differences in δ13C values seemed to be related to age-class specific spatial distribution patterns. Therefore, large and small striped weakfish remain specialized but feeding on different prey at different trophic levels. These results contribute to the study of the diet of striped weakfish, improve the isotopic ecology models and highlight on the importance of accounting for variation in the isotopic composition in response to dietary shifts with the size of one of the most important fishery resources in the region.
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http://dx.doi.org/10.1590/1519-6984.01416DOI Listing
May 2018

Patterns of population structure at microsatellite and mitochondrial DNA markers in the franciscana dolphin ().

Ecol Evol 2016 12 17;6(24):8764-8776. Epub 2016 Nov 17.

Centro de Estudios Biomédicos, Biotecnológicos, Ambientales y Diagnóstico (CEBBAD) Universidad Maimónides Ciudad Autónoma de Buenos Aires Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Ciudad Autónoma de Buenos Aires Argentina; Laboratorio de Ecología Comportamiento y Mamíferos Marinos Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" Ciudad Autónoma de Buenos Aires Argentina; Fundación de Historia Natural Félix de Azara Universidad Maimónides Ciudad Autónoma de Buenos Aires Argentina.

The franciscana dolphin, , is an endemic cetacean of the Atlantic coast of South America. Its coastal distribution and restricted movement patterns make this species vulnerable to anthropogenic factors, particularly to incidental bycatch. We used mitochondrial DNA control region sequences, 10 microsatellites, and sex data to investigate the population structure of the franciscana dolphin from a previously established management area, which includes the southern edge of its geographic range. -statistics and Bayesian cluster analyses revealed the existence of three genetically distinct populations. Based on the microsatellite loci, similar levels of genetic variability were found in the area; 13 private alleles were found in Monte Hermoso, but none in Claromecó. When considering the mitochondrial DNA control region sequences, lower levels of genetic diversity were found in Monte Hermoso, when compared to the other localities. Low levels of gene flow were found between most localities. Additionally, no evidence of isolation by distance nor sex-biased dispersal was detected in the study area. In view of these results showing that populations from Necochea/Claromecó, Monte Hermoso, and Río Negro were found to be genetically distinct and the available genetic information for the species previously published, Argentina would comprise five distinct populations: Samborombón West/Samborombón South, Cabo San Antonio/Buenos Aires East, Necochea/Claromecó/Buenos Aires Southwest, Monte Hermoso, and Río Negro. In order to ensure the long-term survival of the franciscana dolphin, management and conservation strategies should be developed considering each of these populations as different management units.
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http://dx.doi.org/10.1002/ece3.2596DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5192793PMC
December 2016