Evaluación de la condición fisiológica de la almeja Polymesoda caroliniana (Bivalva: Corbiculidae) expuesta a cadmio
In environmental monitoring, the qualitative evaluation of histological alterations has been proposed as a biomarker to evaluate the effects of contamination in aquatic organisms. However, quantitative analysis tools that allow the determination of the health of wild or experimental organisms are no...
| Autor: | |
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | México |
| Institución: | Universidad Autónoma Metropolitana |
| Repositorio: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | español |
| OAI Identifier: | oai:bindani.izt.uam.mx:r494vk27r |
| Acceso en línea: | https://doi.org/10.24275/uami.r494vk27r |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/LEM/Bivalvos -- Taxonomía info:eu-repo/classification/LEM/Cadmio -- Toxicología info:eu-repo/classification/LEM/Bivalves -- Taxonomy info:eu-repo/classification/LEM/Cadmium -- Toxicology info:eu-repo/classification/cti/2 |
| Sumario: | In environmental monitoring, the qualitative evaluation of histological alterations has been proposed as a biomarker to evaluate the effects of contamination in aquatic organisms. However, quantitative analysis tools that allow the determination of the health of wild or experimental organisms are not considered. The aim was to calculate the health index of clams Polymesoda caroliniana exposed to 300 µg/L of cadmium (in devices with sediment and without sediment) through the quantitative analysis of tissue alterations. 80 preparations of gonad and digestive gland stained with H-E were analyzed. The pathological alterations were characterized and a prevalence matrix was constructed. Each alteration was assigned a pathological importance factor (1 to 3) and an ascending value according to the dissemination of the alteration. Data were statistically analyzed with the Student´s T test (when the data presented normality and homoscedasticity) and Mann-Whitney U test (when the data did not present normality or homoscedasticity) to evaluate the differences between the control and experimental organisms. The observed alterations in organisms exposed to cadmium were: brown cells, atrophies, eosinophilic secretions in the digestive gland; only spherical inclusions were observed in the gonad. The alterations observed are type 2 (moderate reversible) and the highest health index was in the gonad of 0.6, which means that it had greater damage with respect to the digestive gland. The use of categories of histopathological evaluation in other organs is recommended to establish a general health index in organisms exposed to cadmium, which will allow inferring the effects of cadmium in wild organisms. |
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