Unlike humans, frogs and other amphibians do not need to rely on their lungs to breathe. Their unique skin helps you exchange drinks with oxygen. But how do frogs breathe and drink their skin?
Frogs’ skin is complex. It is thin and covered with glands that moisten the skin and produce mucus, and is porous enough to penetrate atmospheric molecules.
“[Their skin] Christopher Laxley, curator and herpetologist at the American Museum of Natural History in New York, is designed to allow both oxygen to enter the skin.
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A network of small blood vessels just below the skin absorbs oxygen directly from water or air, and also allows carbon dioxide to be driven out of the body in a process called skin respiration, Kurt Schwenk, an evolutionary biologist at the University of Connecticut who studied the respiratory mechanisms at the University of Connecticut, studied the respiratory mechanisms of flower groups and tadpole. “It’s almost the same as the lung system,” added Raxworthy.
Frogs can also breathe through the lungs and mouth lining, but skin breathing allows the frog to survive underwater and through long hibernation. “With little trials, having moist skin, just blood vessels in it, they’ll exchange gas and water in the skin whether they like it or not,” Schwenk said, but not all frogs equally dependent on skin breathing.
Tadpoles, on the other hand, have yet to develop gills, so they need to breathe air from the surface to survive. But when they hatch, they are too small to break the surface tension of the water. Instead, they create their own bubbles. In a 2020 study, Schwenck and his colleagues observed tadpoles swimming just below the surface, where they quickly breathed air and formed bubbles. They then push air bubbles into their lungs.
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The porous skin of frogs is also the way they drink it. “That water is in every space in the skin and is absorbed by the cells and bloodstream across the cell membrane,” added Schwenk. Many frogs even have a very angiogenic area known as “drinking patches,” through which they can absorb large amounts of water.
Some frogs found in arid areas, such as triling frogs and water-retaining frogs that live in Australia’s deserts, are particularly proficient at absorbing water during the rainy season. “They store it, and then they enter the burrows, into the ground, and sometimes even place an extra layer of mucus around them. And they can survive on water stored inside for months or even years until the next rain comes,” explained Raxworthy.
It’s a handy tool, but the permeability of their skin means that frogs and other amphibians are particularly vulnerable to pollutants and climate change, Schwenck said. Studies have shown that permeability of frog skin routinely exposes animals to commercially available chemicals and microplastics. And because frogs need to moist their skin to survive, it is possible that drought and warm weather scientists could predict that frog habitat could be reduced, especially in the Amazon rainforests and the Atlantic rainforests of Brazil, Argentina and Paraguay.
“Amphibians tend to be part of the first group you start to fade or disappear, and that’s usually a sign of an environmental problem,” Raxworthy said. Losing frogs changes the balance of the ecosystem due to their position in relation to the food chain. It keeps insect populations under control and is prey to snakes and birds.
Time will tell if some frog species will adapt to changing climates. “The question that is being performed through all climate change biology is whether a particular species is affected by climate change, whether we are all and can adapt quickly enough,” Schwenck said. “In most cases, climate change occurs much faster than animals can adapt.”
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