Papers by Cristóbal Arredondo
Anales del Instituto de la Patagonia, Dec 30, 2022
Contribución de los autores; C.D: diseño del estudio, trabajo de campo, análisis de datos, desarr... more Contribución de los autores; C.D: diseño del estudio, trabajo de campo, análisis de datos, desarrollo del borrador y edición del manuscrito. C.A: Diseñó del estudio, trabajo de campo, análisis de datos, revisión del manuscrito. J. C: Trabajo de campo, sistematización de datos, preparación de figuras del manuscrito. A.K: Concepción del estudio, trabajo en terreno, revisión del manuscrito. A.V: Concepción del estudio, revisión y edición del manuscrito.
We report the mass stranding of 46 false killer whales in the Strait of Magellan in February 2013... more We report the mass stranding of 46 false killer whales in the Strait of Magellan in February 2013. We present observation-based information about body size, sex, dental formula and necropsies. Sexual dimorphism in body length was clear, with males being significantly larger than females. Dental formula coincided with previous reports for the species, with asymmetry present in females. Individuals showed normal body conditions without any signs of apparent disease. The cause of the stranding remains unknown, however the coastal morphology hypothesis is a possible explanation.Fil: Haro, Daniela. Universidad de Chile; ChileFil: Aguayo Lobo, Anelio. Instituto Antártico Chileno; ChileFil: Blank, Olivia. Clínica Veterinaria Timaukel; ChileFil: Cifuentes, Constanza. Universidad Mayor; ChileFil: Dougnac, Catherine. Universidad de Chile; ChileFil: Arredondo, Cristóbal. Universidad de Chile; ChileFil: Pardo, Catalina. Universidad de Chile; ChileFil: Cáceres Saez, Iris. Consejo Nacional de Inv...
Polar Biology, 2022
Macro-elements such as potassium (K), sodium (Na), chlorine (Cl), magnesium (Mg), and calcium (Ca... more Macro-elements such as potassium (K), sodium (Na), chlorine (Cl), magnesium (Mg), and calcium (Ca) are essential in marine mammals' nutrition. These elements are involved in physiological processes. Upon consumption, they are assimilated and accumulate in tissues. For the first time, they were detected in lung, spleen, liver, kidney, muscle, uterus, ovary, and testis of 5, and in skin of 12, stranded false killer whales (Pseudorca crassidens) in sub-Antarctic waters of the South Atlantic Ocean. Results showed that testis reached the highest potassium mean concentration, 1.62 (0.25) wt% dry weight (DW) (standard deviation in parentheses), followed by muscle, 1.11 (0.12) wt% DW, and decreasing in skin to 0.351 (0.098) wt% DW. Testis and lung exhibited among the highest sodium concentrations, with 0.96 (0.20) and 0.93 (0.18) wt% DW, respectively. Chlorine concentration was highest in testis, (1.55 wt% DW) followed by uterus (1.26 wt% DW) and kidney [1.13 (0.16) wt% DW]. Magnesium reached higher concentrations in uterus (0.134 wt% DW) and muscle [0.109 (0.054) wt% DW]. Calcium was higher in lung [0.230 (0.05) wt% DW] and kidney (0.149; 0.294 wt% DW). Hepatic levels of K, Na, Cl, and Mg in false killer whales are generally within the range of other studied species, while Ca levels are the highest reported. Macro-element concentration ranges were established for diverse tissues and organs of the false killer whale as the current best available baseline reference values for assessments of general condition.
Environmental Science and Pollution Research, 2021
On a global scale, cetaceans are recognized well indicators of marine ecosystem health. Trace ele... more 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−1 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−1 DW, respectively, and Cs in muscle 0.36 (0.12) μg g−1 DW, while Ni concentrations range (<0.05–0.91 μg g−1 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−1 DW, respectively, while Hg was highest in the liver 1068 (234) μg g−1 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.
Esta base de datos contiene 69 registros de ocurrencias de visón registrados por WCS Chile durant... more Esta base de datos contiene 69 registros de ocurrencias de visón registrados por WCS Chile durante sus operaciones en relación con el control de especies invasoras, de éstos, 66 se localizan en el Islote Albatros (AMCP-MU Seno Almirantazgo), una en Bahía Jackson (Parque Karukinka) y dos en el Lote 10 del Parque Karukinka. Todo en Tierra del Fuego, Región de Magallanes y la Antártica chilena, al sur de Chile. En particular los 66 registros en islote Albatros (o asociados a este) se realizaron en el marco del monitoreo de la única colonia de albatros de ceja negra (Thalassarche melanophris) que existe en aguas interiores. Este registro contiene los primeros registros de visón llegando a esa zona. Parte de este trabajo ha sido financiado por el Ministerio del Medio Ambiente (Licitaciones ID 612543-2-L116, 612543-2-LE17 y 612543 -1-LE19), The David and Lucile Packard Foundation y WCS. Los eventos fueron registrados entre el 2015 y 2020.
Marine Pollution Bulletin, 2019
is a non-essential metal known to bioaccumulate in aquatic organisms. We determined Ag concentrat... more 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 −1 in liver, 0.008-7.41 μg g −1 in spleen, 0.004-5.71 μg g −1 in testis, 0.757-1.69 μg g −1 in kidney, 0.011-0.078 μg g −1 in lung and < 0.01-0.038 μg g −1 in muscle, whereas in the single samples of uterus and ovary were 0.051 and 0.023 μg g −1 ; 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.
Chemosphere, 2018
The study was carried out to determine Hg and Se concentrations in false killer whales stranded o... more 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 gdry weight (DW) (standard deviation in parenthesis) was markedly higher than those in kidney 272 (152) μg gDW, lung 423 (325) μg gDW, spleen 725 (696) μg gDW, muscle 118 (94) μg gDW and testicle 18.0 (2.8) μg gDW. Mean Se concentration in liver, 398 (75) μg gDW, was higher than those in kidney 162 (69) μg gDW, lung 128 (84) μg gDW, spleen 268 (245) μg gDW, muscle 47 (38) μg gDW and testicle 25.4 (2.1) μg gDW. 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 val...
Revista de biología marina y oceanografía, 2015
We report the mass stranding of 46 false killer whales in the Strait of Magellan in February 2013... more We report the mass stranding of 46 false killer whales in the Strait of Magellan in February 2013. We present observation-based information about body size, sex, dental formula and necropsies. Sexual dimorphism in body length was clear, with males being significantly larger than females. Dental formula coincided with previous reports for the species, with asymmetry present in females. Individuals showed normal body conditions without any signs of apparent disease. The cause of the stranding remains unknown, however the coastal morphology hypothesis is a possible explanation.
Epidemiology and Infection, 2014
SUMMARYPatagonia in southern South America is among the few world regions where direct human impa... more SUMMARYPatagonia in southern South America is among the few world regions where direct human impact is still limited but progressively increasing, mainly represented by tourism, farming, fishing and mining activities. The sanitary condition of Patagonian wildlife is unknown, in spite of being critical for the assessment of anthropogenic effects there. The aim of this study was the characterization ofSalmonella entericastrains isolated from wild colonies of Magellanic penguins (Spheniscus magellanicus) located in Magdalena Island and Otway Sound, in Chilean Patagonia. Eight isolates ofSalmonellawere found, belonging to Agona and Enteritidis serotypes, with an infection rate of 0·38%. Resistance to ampicillin, cefotaxime, ceftiofur and tetracycline antimicrobials were detected, and some of these strains showed genotypic similarity withSalmonellastrains isolated from humans and gulls, suggesting inter-species transmission cycles and strengthening the role of penguins as sanitary sentin...
Avances en Ciencias Veterinarias, 2013
Environmental Science and Pollution Research, 2021
On a global scale, cetaceans are recognized well indicators of marine ecosystem health. Trace ele... more 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 −1 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 −1 DW, respectively, and Cs in muscle 0.36 (0.12) μg g −1 DW, while Ni co...
Journal of Arid Environments, 2016
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Papers by Cristóbal Arredondo