Turtles cannot breathe underwater in the same way that fish do. They are air-breathing reptiles and must surface to breathe. However, some species of turtles have adapted to their aquatic environments in interesting ways:
-
Lungs: Turtles have lungs and rely on them to breathe air. They surface periodically to inhale oxygen and exhale carbon dioxide.
-
Extended Breath-Holding: Many aquatic turtles can hold their breath for extended periods, ranging from several minutes to several hours, depending on the species, water temperature, and activity level. For example, sea turtles can stay submerged for up to several hours when resting or sleeping.
-
Nasal Flaps: Some turtles have specialized structures in their nasal passages that can help prevent water from entering while they are submerged. They can close their nostrils while diving.
-
Cutaneous Respiration: Some turtles can absorb a small amount of oxygen through their skin, especially in cold water, where their metabolic rate is lower. This is not their primary means of respiration but can supplement their oxygen intake when they are underwater.
-
Behaviors: Turtles often bask on land to warm up and ensure they have ample oxygen, which helps them prepare for longer dives.
Overall, while turtles can stay underwater for long periods, they ultimately need to surface to breathe air.