Abstract:Hot, dry summer conditions impose physiological stress on endotherms, yet we have a poor understanding of how endotherms seasonally adjust their costs of thermoregulation under hot conditions. We determined whether seasonal phenotypic plasticity in evaporative cooling capacity at high temperatures explained how the range-restricted Cape Rockjumper (Chaetops frenatus; hereafter "Rockjumper"), copes with hot and dry summer temperatures of the temperate mountain peaks of southwest South Africa. We measured evapor… Show more
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