Aarhus University Seal / Aarhus Universitets segl

Lisa Bjerregaard Jørgensen

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

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Cold mortality is not caused by oxygen limitation or loss of ion homeostasis in the tropical freshwater shrimp Macrobrachium rosenbergii. / Jorgensen, Lisa B.; MacMillan, Heath A.; Overgaard, Johannes.

In: Cryobiology, Vol. 76, 06.2017, p. 146-149.

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@article{52b2d2dea69c41d3a2fcd9aa66c91e4c,
title = "Cold mortality is not caused by oxygen limitation or loss of ion homeostasis in the tropical freshwater shrimp Macrobrachium rosenbergii",
abstract = "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.",
keywords = "Ion balance, Sodium, Potassium, Cold stress, Crustacean, OCLTT, Lactate, Metabolism, THERMAL TOLERANCE",
author = "Jorgensen, {Lisa B.} and MacMillan, {Heath A.} and Johannes Overgaard",
year = "2017",
month = "6",
doi = "10.1016/j.cryobio1.2017.04.011",
language = "English",
volume = "76",
pages = "146--149",
journal = "Cryobiology",
issn = "0011-2240",
publisher = "Academic Press",

}

RIS

TY - JOUR

T1 - Cold mortality is not caused by oxygen limitation or loss of ion homeostasis in the tropical freshwater shrimp Macrobrachium rosenbergii

AU - Jorgensen, Lisa B.

AU - MacMillan, Heath A.

AU - Overgaard, Johannes

PY - 2017/6

Y1 - 2017/6

N2 - 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.

AB - 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.

KW - Ion balance

KW - Sodium

KW - Potassium

KW - Cold stress

KW - Crustacean

KW - OCLTT

KW - Lactate

KW - Metabolism

KW - THERMAL TOLERANCE

U2 - 10.1016/j.cryobio1.2017.04.011

DO - 10.1016/j.cryobio1.2017.04.011

M3 - Journal article

VL - 76

SP - 146

EP - 149

JO - Cryobiology

JF - Cryobiology

SN - 0011-2240

ER -