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The dolphins' heart rates increased during ascent. The heart rates during a dive of these actively swimming dolphins were similar to heart rates of a sedentary dolphin at 2 m depth, showing that the heart rate response in diving dolphins is dominated by the diving response and not by an exercise response.
Slowing the heart rate reduces the cardiac oxygen consumption, and compensates for the hypertension due to vasoconstriction. However, breath-hold time is reduced when the whole body is exposed to cold water as the metabolic rate increases to compensate for accelerated heat loss even when the heart rate is significantly slowed.
A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
For example, heart rate, metabolic rate and transport cost was reduced by up to 70% during wave-riding compared to swimming at speeds 1 m/s slower in bottlenose dolphin. [19] Wave-riding behaviour can be performed by dolphins from minutes up to several hours, [19] and therefore is a useful energy-saving mechanism for swimming at higher speeds.
They are also capable of bradycardia (reduced heart rate), and vasoconstriction (shunting most of the oxygen to vital organs such as the brain and heart) to allow extended diving times and cope with oxygen deprivation. [32] If oxygen is depleted , marine mammals can access substantial reservoirs of glycogen that support anaerobic glycolysis.
The bottlenose dolphin is a toothed whale in the genus Tursiops.They are common, cosmopolitan members of the family Delphinidae, the family of oceanic dolphins. [3] Molecular studies show the genus contains three species: the common bottlenose dolphin (Tursiops truncatus), the Indo-Pacific bottlenose dolphin (Tursiops aduncus), and Tamanend's bottlenose dolphin (Tursiops erebennus).
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The click rate increases when approaching an object of interest. Dolphin echolocation clicks are amongst the loudest sounds made by marine animals. [52] Bottlenose dolphins have been found to have signature whistles, a whistle that is unique to a specific individual.