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Volume 43 - Number 3 - 2008
Artículo


Metabolic characterization of Diplodon chilensis (Gray, 1828) (Bivalvia: Hyriidae) exposed to experimental anox

Maritza A. Grandón1, Javier A. Barros1 y Rodrigo R. González1, 2

 

1Ingeniería en Biotecnología Marina y Acuicultura, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile
2Centro de Investigación Oceanográfica en el Pacífico Sur-Oriental (COPAS), Universidad de Concepción, Casilla 160-C, Concepción, Chile

 

E-mail:  maritzagrandon@udec.cl


Diplodon chilensis is a freshwater bivalve inhabiting from northern Chile to Tierra del Fuego. This species has a high filtration capacity and great tolerance to hypoxic environments. Thus, the aim of this study was to characterize, for the first time, anaerobic metabolism of D. chilensis using an enzymatic approach by measuring piruvate oxidoreductases and malate dehydrogenase activities in two groups of organisms. A first group (G1) corresponded to organisms analyzed immediately after their collection from Lleu-Lleu Lake (36ºS). The second group (G2) corresponded to organisms analyzed after exposition to extreme anoxic conditions in laboratory. Enzymatic activities were measured in abductor muscle, foot, gills, hepatopancreas gland, and mantle-gonad tissue. Positive activities were detected for piruvate oxidoreductases (PORs: lactate dehydrogenase (LDH), octopine dehydrogenase (OPDH), strombine dehydrogenase (STRDH), alanopine dehydrogenase (ALPDH)) and malate dehydrogenase (MDH). MDH showed the highest dehydrogenase activity observed in all tissue and groups analyzed. Nevertheless, only those organisms exposed to extreme anoxic conditions showed significant relationships between MDH and LDH activities and a high ratio of (MDH/LDH) between them. All these enzymatic features of D. chilensis correspond to a species with a successfully anaerobic metabolism to cope with extreme anaerobic conditions

 

Key words: LDH, MDH, opine, metabolism

 

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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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