Maintenance of hindgut reabsorption during cold exposure is a key adaptation for Drosophila cold tolerance

Mads Kuhlmann Andersen & Johannes Overgaard
Maintaining extracellular osmotic and ionic homeostasis is crucial for organismal function. In insects, hemolymph volume and ion content is regulated by the secretory Malpighian tubules and reabsorptive hindgut. When exposed to stressful cold, homeostasis is gradually disrupted, characterized by a debilitating increase in extracellular K+ concentration (hyperkalemia). Accordingly, studies have found a strong link between the species-specific cold tolerance and their ability to maintain ion and water homeostasis at low temperature. This is also true...
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