28.1.3 Orientation in the Ocean – Sensory Adaptation –
Communication
• Dolphins communicate underwater with sound by echolocation, transmitting
sounds and receiving echoes (Raynolds, Scheffer) – Sea Grant Alaska Mammal
Adaptation.
• Dolphins emit a focused heam 1000 quickly of high frequency, by passing air
from the body nares through the phonic lips.
• Dolphin has a very large brain (i.e. 2000 g). When a dolphin sleeps, only half of
its brain is asleep. It swims up to the surface of the water to take a breath. A
portion of the brain is still alert.
• Dolphins are often very social animals, known to help each other when one of
the group is injured.
• Dolphin often hunts together and also participate migrations, in a group or
individually. Echolocation is important because the dolphin needs to hunt; the
night or in turbid as deep water.
• Dolphin brains process information with a very high learning ability.
• They mate for breeding but also for pleasure. The male has 3–4 females
around him.
• Dolphin is a highly intelligent creature, often performing acrobatic figures above
the water surface (Marine Mammals).
28.1.4 Deep Diving
• Marine mammal lungs are smaller that human but they use oxygen more
efficiently up to 70% better.
• Dolphin has bright blood volume to 10–12% from his body weight.
• Dolphin have greater oxygen retention.
• Increased myoglobin make.
• High tolerance to lactic acid and carbon dioxide.
• Lungs and ribs are collapsible.
• Nitrogen absorption is limited.
• Dolphin have the capacity to reduced heart rate (bradycardia <40/min).
• Increased the amount of oxygen stored in their intern tissues.
• For prolonged submersion (hypoxia – 15–20 min under water) the dolphin can
access substantial reserves of glycogen that supports for anaerobic glycolysis.
• Reduced blood flow to non vital organs.
• High hemoglobin in blood (Nicolici-Schultz and Neculae).
28 The Black Sea Dolphin Nephron Studied by Romanian Nobel Laureate George. . .
487
Communication
• Dolphins communicate underwater with sound by echolocation, transmitting
sounds and receiving echoes (Raynolds, Scheffer) – Sea Grant Alaska Mammal
Adaptation.
• Dolphins emit a focused heam 1000 quickly of high frequency, by passing air
from the body nares through the phonic lips.
• Dolphin has a very large brain (i.e. 2000 g). When a dolphin sleeps, only half of
its brain is asleep. It swims up to the surface of the water to take a breath. A
portion of the brain is still alert.
• Dolphins are often very social animals, known to help each other when one of
the group is injured.
• Dolphin often hunts together and also participate migrations, in a group or
individually. Echolocation is important because the dolphin needs to hunt; the
night or in turbid as deep water.
• Dolphin brains process information with a very high learning ability.
• They mate for breeding but also for pleasure. The male has 3–4 females
around him.
• Dolphin is a highly intelligent creature, often performing acrobatic figures above
the water surface (Marine Mammals).
28.1.4 Deep Diving
• Marine mammal lungs are smaller that human but they use oxygen more
efficiently up to 70% better.
• Dolphin has bright blood volume to 10–12% from his body weight.
• Dolphin have greater oxygen retention.
• Increased myoglobin make.
• High tolerance to lactic acid and carbon dioxide.
• Lungs and ribs are collapsible.
• Nitrogen absorption is limited.
• Dolphin have the capacity to reduced heart rate (bradycardia <40/min).
• Increased the amount of oxygen stored in their intern tissues.
• For prolonged submersion (hypoxia – 15–20 min under water) the dolphin can
access substantial reserves of glycogen that supports for anaerobic glycolysis.
• Reduced blood flow to non vital organs.
• High hemoglobin in blood (Nicolici-Schultz and Neculae).
28 The Black Sea Dolphin Nephron Studied by Romanian Nobel Laureate George. . .
487