Cold mortality is not caused by oxygen limitation or loss of ion homeostasis in the tropical freshwater shrimp Macrobrachium rosenbergii

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Using the tropical crustacean Macrobrachium rosenbergii we investigate two popular hypotheses proposed to explain loss of function in ectotherms exposed to critically high and low temperatures. Specifically, we examine whether acute cold stress disrupts hemolymph and muscle ion balance or causes a loss of oxygen availability. We found that acute cold stress causes loss of righting response at 13 degrees C, but that a cold-induced loss of ion-balance only occurs after onset of mortality. In regards to oxygen availability, we found no decrease in hemolymph oxygen content during cold exposure, and no changes in the concentrations of the anaerobic end products L-lactate and succinate in the tail muscle of the shrimp. Therefore, our results support neither of these two popular hypotheses and it remains unknown what physiological perturbations determine the lower limits of thermal tolerance in Macrobrachium rosenbergii. (C) 2017 Elsevier Inc. All rights reserved.

Original languageEnglish
JournalCryobiology
Volume76
Pages (from-to)146-149
Number of pages4
ISSN0011-2240
DOIs
Publication statusPublished - Jun 2017

    Research areas

  • Ion balance, Sodium, Potassium, Cold stress, Crustacean, OCLTT, Lactate, Metabolism, THERMAL TOLERANCE

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