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F.p. Campos - One of the best experts on this subject based on the ideXlab platform.

Reinaldo José Da Silva - One of the best experts on this subject based on the ideXlab platform.

J. Vingada - One of the best experts on this subject based on the ideXlab platform.

  • Toxic Element Concentration in the Atlantic Gannet Morus bassanus (Pelecaniformes, Sulidae) in Portugal
    Archives of Environmental Contamination and Toxicology, 2008
    Co-Authors: P. Mendes, C. Eira, J. Torres, A. M. V. M. Soares, P. Melo, J. Vingada
    Abstract:

    The present study provides the first data on inorganic element levels in juvenile, subadult, and adult Atlantic gannets ( Morus bassanus ). Physiological and potentially toxic elements (As, Cd, Co, Cr, Cu, Hg, Mn, Pb, Se, and Zn) were assessed by ICP-MS in kidney, liver, muscle, and feathers of 31 gannets, including 18 juveniles, 7 subadults, and 6 adults. The effect of age and tissue on element accumulation was also assessed. Mercury was roughly above the minimum level for adverse effects in birds. A higher accumulation of Se and Cd was detected in kidney, Pb in feathers, and Mn in liver. Age was found to affect the accumulation of Cd, Co, Hg, Mn, Se, and Zn. Adults presented significantly lower levels of Mn, Se, and Zn than subadults. Linear positive relationships within tissues were detected involving Se-Cd and Se-Hg. Also, positive linear relationships were detected among kidney, liver, and muscle, with emphasis on relationships involving Cd, Hg, Se, and Zn, which may be indicative of analogous regulation mechanisms in those organs. Atlantic gannets occurring in the study area leave their reproduction sites as juveniles. During their development process, several molting cycles occur and thus the possible contamination risk by Hg should reflect levels in the development areas rather than contamination levels in reproduction areas. The present study provides basic information on multielement accumulation in Morus bassanus , which may help us to understand the behavior and toxicity of various elements in marine birds.

Beltzer, Adolfo Hector - One of the best experts on this subject based on the ideXlab platform.

  • Pesca con cebo activo por Ardea alba (Pelecaniformes: Ardeidae) en Argentina
    UNED Research Journal, 2018
    Co-Authors: Sovrano, Lorena Vanesa, Beltzer, Adolfo Hector
    Abstract:

    El comportamiento de pesca con cebo activo ha sido registrado en especies de la familia Ardeidae. Para la Garza Blanca (Ardea alba) sólo existe un registro previo en la literatura. Mediante este aporte se documenta el registro de pesca con cebo activo por la Garza Blanca observado en un Parque urbano de Argentina.Fil: Sovrano, Lorena Vanesa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Beltzer, Adolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

  • Ecología trófica de la Garza blanca Ardea alba (Pelecaniformes: Ardeidae) en un humedal del río Paraná, Argentina
    'Universidad Estatal a Distancia', 2013
    Co-Authors: Lorenzón, Rodrigo Ezequiel, Ronchi Virgolini, Ana Laura, Beltzer, Adolfo Hector
    Abstract:

    Se estudió la ecología trófica de la Garza blanca (Ardea alba) mediante el análisis del contenido estomacal de 38 individuos capturados entre 1990 y 1993 en un humedal del río Paraná, Argentina. El espectro trófico resultó compuesto por 33 entidades taxonómicas, siendo los peces el ítem - presa predominante. El mayor porcentaje de las presas (40%) correspondió al intervalo de clase 21-30mm. La especie no mostró selectividad dietaria y utilizó con mayor frecuencia las unidades ambientales de Vegetación acuática y Aguas abiertas. La predominancia de los peces en la dieta coincidió con lo informado en otros estudios, aunque las características del espectro trófico la señalaron como una especie oportunista. Sólo se encontraron diferencias en el tamaño de las presas al comparar la ecología trófica de la especie con la congenérica y simpátrica Ardea cocoi.Feeding ecology of Great Egret Ardea alba (Pelecaniformes: Ardeidae) in a wetland of the Paraná River, Argentina. Herons as a group have contributed substantially to the field of evolutionary ecology through studies that have helped elucidate mechanisms that allow coexistence of sympatric species. Detailed descriptions of feeding ecology are essential for understanding mechanisms of coexistence. Despite being one of the most common species in Argentina, detailed studies on the feeding ecology of Great Egrets Ardea alba are scarce. We studied Great Egret feeding ecology through an analysis of the stomach contents of 38 individuals captured between 1990 and 1993 in a wetland on the Paraná River, Argentina. The diet included a total of 33 taxa, with fishes as the predominant prey item. The predominance of fishes in the diet agrees with results of previous studies. There was, however, no evidence of dietary selectivity. The largest proportion of prey (40%) were 21 – 30mm in length. Distribution of prey sizes differed between the Great Egret and the sympatric and congeneric Cocoi Heron (Ardea cocoi). Great Egrets primarily foraging in areas characterized by aquatic vegetation and in areas with open water.Fil: Lorenzón, Rodrigo Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Ronchi Virgolini, Ana Laura. Universidad Autónoma de Entre Ríos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Beltzer, Adolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

P.j. Faria - One of the best experts on this subject based on the ideXlab platform.