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Artículo

Glacier melting and response of Daphnia oxidative stress

Laspoumaderes, CeciliaIcon ; Souza, María SolIcon ; Modenutti, Beatriz EstelaIcon ; Balseiro, Esteban GabrielIcon
Fecha de publicación: 07/2017
Editorial: Oxford University Press
Revista: Journal of Plankton Research
ISSN: 0142-7873
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

We analysed the antioxidant response of Daphnia commutata in an oligotrophic North-Patagonian lake (Lake Mascardi) that receives inputs of glacial clay in one extreme, which creates a plume with a consequent gradient in underwater light intensity (including ultraviolet radiation) and suspended solid material. This gradient in light intensity also affects the light:nutrient ratio and hence the C:P ratio of the food for planktonic herbivores. In the field, along a 9 km transparency gradient, we measured the activities of glutathione S-transferase (GST) and catalase (CAT) enzymes involved in protection against UVR. Through laboratory experiments, we tested the possible role of suspended sediment particles as an additional stressor for a filter feeding zooplankter. Our results indicate that the inputs of glacial clay into the lake have antagonistic effects on Daphnia. Glacial clay was a stress mitigating factor to UVR (decrease in the antioxidant response of GST activity), but was also a source of stress that generated feeding interference, increased respiration rates and consequently increased CAT activity. This light gradient also affected the C:P ratio of food and the maximum response in GST is also modulated by food quality (C:P ratio) that limits its activity in the transparent end of the gradient.
Palabras clave: Antioxidant Enzymes , Food Quality , Glacial Clay , Global Change , Turbidity , Ultraviolet Radiation
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/58522
DOI: https://dx.doi.org/10.1093/plankt/fbx028
URL: https://academic.oup.com/plankt/article/39/4/675/3807243
Colecciones
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Citación
Laspoumaderes, Cecilia; Souza, María Sol; Modenutti, Beatriz Estela; Balseiro, Esteban Gabriel; Glacier melting and response of Daphnia oxidative stress; Oxford University Press; Journal of Plankton Research; 39; 4; 7-2017; 675-686
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