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Physiological energetics of the estuarine crab Hemigrapsus crenulatus (Crustacea: Decapoda: Varunidae): responses to different salinity levels

Published online by Cambridge University Press:  14 January 2010

Mauricio Urbina ,
Kurt Paschke ,
Paulina Gebauer  and
Oscar R. Chaparro
Mauricio Urbina
Affiliation:
Instituto de Acuicultura, Universidad Austral de Chile, Casilla 1327, Puerto Montt, Chile
Kurt Paschke*
Affiliation:
Instituto de Acuicultura, Universidad Austral de Chile, Casilla 1327, Puerto Montt, Chile
Paulina Gebauer
Affiliation:
Centro de Investigaciones I-Mar, Universidad de Los Lagos, Puerto Montt, Chile
Oscar R. Chaparro
Affiliation:
Instituto de Biología Marina Dr Jürgen Winter, Universidad Austral de Chile, Valdivia, Chile
*
Correspondence should be addressed to: K. Paschke, Instituto de Acuicultura, Universidad Austral de Chile, Casilla 1327, Puerto Montt, Chile email: kpaschke@uach.cl
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Abstract

Hemigrapsus crenulatus is an abundant and frequent decapod crustacean inhabiting estuarine environments, where it must tolerate large shifts in salinity. The present study evaluates the effect of salinity (5, 13, 21 and 30 psu) on the adult physiological processes related to the energy balance. The growth potential (SFG) and the respired oxygen:excreted nitrogen ratio were used as indices of stress. Ingestion, excretion and respiration rates showed a significant dependence on salinity, being higher at low salinities. The assimilation efficiency remained constant along the studied salinity gradient. The assimilation and ingestion rates were inversely related with the salinity. Given this scenario, the growth potential remained constant within the studied salinity gradient, as did the oxygen:nitrogen ratio. The results suggest that the increased energy losses at low salinity due to respiration and excretion are compensated by an increment in the ingestion rate, contributing to the success of H. crenulatus in dynamic habitats such as estuaries.

Keywords

Hemigrapsus crenulatussalinityecophysiologygrowth potentialestuaries
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 2 , March 2010 , pp. 267 - 273
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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