Miya Pearson
Aestivation, derived from the Latin aestas, meaning summer, is a state of dormancy similar to hibernation but occurring in the summer. Animals that aestivate enter a state of low metabolic activity and inactivity to protect themselves from hot and dry climates and the scarcity of food and water. Aestivation is also known as summer sleep.
| Characteristics | Values |
|---|---|
| Name | Aestivation (or Estivation in American English) |
| Etymology | Latin: aestas (summer); aestivāre (to spend the summer) |
| Other forms | Estivate (verb), estival (adjective) |
| Opposite | Hibernation |
| Occurrence | Invertebrate and vertebrate animals |
| Purpose | To conserve energy, retain water in the body, ration the use of stored energy, handle nitrogenous end products, and stabilize bodily organs, cells, and macromolecules |
| Animal examples | Butterflies, earthworms, molluscs, arthropods, reptiles, amphibians, lungfish, adult alfalfa weevils, Australian crabs, North American desert tortoises, crocodiles, salamanders, cane toads, greater sirens, California red-legged frogs, water-holding frogs |
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What You'll Learn
- 'Aestivation' or 'estivation' is the term for 'summer sleep'
- Animals undergo aestivation to conserve energy and retain water
- Aestivation is similar to hibernation but occurs in the summer
- Animals that aestivate include reptiles, amphibians, and molluscs
- Aestivation is characterised by a lowered metabolic rate and inactivity
'Aestivation' or 'estivation' is the term for 'summer sleep'
Aestivation, or estivation, is the term used to describe a state of dormancy in animals during the summer months. The word comes from the Latin aestas, meaning 'summer', and is similar to hibernation, which is the state of dormancy some animals enter during the winter.
Aestivation is characterised by inactivity and a lowered metabolic rate, which helps animals to survive high temperatures and arid conditions. It is a strategy used by both invertebrates and vertebrates to avoid damage from high temperatures and the risk of desiccation. Aestivation can also help animals to conserve energy during periods of food scarcity. The process is reversible, and animals can quickly return to a normal state when conditions improve.
Aestivation is observed in animals living in desert and tropical regions, such as earthworms, molluscs, arthropods, reptiles, and amphibians. For example, the lungfish can aestivate and survive without water for three years. The California red-legged frog may aestivate to conserve energy when its food and water supply is low. It buries itself in sandy ground in a secreted, water-tight mucus cocoon during periods of hot, dry weather.
The primary physiological and biochemical concerns for an aestivating animal are to conserve energy, retain water in the body, ration the use of stored energy, handle nitrogenous end products, and stabilise bodily organs, cells, and macromolecules. To stabilise the macromolecules, aestivators will enhance antioxidant defences and elevate chaperone proteins.
In addition to its zoological definition, the word 'estivate' can also be used to describe a person staying at home and avoiding social activities during the summer.
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Animals undergo aestivation to conserve energy and retain water
Aestivation, derived from the Latin aestivare, meaning "to spend the summer", is a state of dormancy similar to hibernation, but occurring in the summer. Animals undergo aestivation to protect themselves from high temperatures, droughts, and food shortages. This survival strategy is characterized by a lowered metabolic rate, slower heartbeat, sluggish breathing, and a drop in body temperature.
The primary goal of aestivation is to conserve energy and retain water in the body. This is achieved through a reduction in macromolecule synthesis and degradation, as well as the production of protective proteins that shield cells from damage during dormancy. Animals that aestivate carefully prepare for the dormant period by seeking out locations with suitable moisture and temperature while storing extra energy in their tissues.
Invertebrates and vertebrates are among the animals that undergo aestivation to avoid damage from high temperatures and the risk of desiccation. Some examples of animals that aestivate include the Australian freshwater crocodile, desert tortoise, and lungfish. The western swamp turtle, for instance, aestivates by burying itself in mud during the dry season to survive the hot summers in its ephemeral swamp habitat.
Aestivation is a widely used strategy across the animal kingdom, with fossil records suggesting it may have evolved several hundred million years ago. It is a light" state of dormancy, allowing organisms to quickly return to a normal state when conditions improve. This adaptability highlights the remarkable ability of animals to develop specific adaptations to unfavorable environmental conditions, showcasing nature's ingenuity in survival tactics.
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Aestivation is similar to hibernation but occurs in the summer
Aestivation, derived from the Latin word "aestivāre", means "to spend the summer". It is a state of dormancy similar to hibernation, but it occurs during the summer. Animals undergo aestivation to protect themselves from hot and dry conditions, mainly in desert regions. This is done to prevent water loss or dehydration and to save energy.
Aestivation is characterised by inactivity and a lowered metabolic rate, which helps animals deal with high temperatures and arid conditions. Both terrestrial and aquatic animals undergo aestivation, and it is observed in both invertebrates and vertebrates. Examples of animals that aestivate include bees, snails, earthworms, salamanders, frogs, crocodiles, tortoises, and some plants like guava.
The primary goal of aestivation is to conserve energy, retain water, and stabilise bodily functions during periods of extreme heat and dryness. Animals that aestivate may also face food shortages, so they try to get maximum nutrition during the rainy and winter seasons and use stored energy during aestivation.
Aestivation is a survival strategy for animals living in harsh summer conditions, just as hibernation helps animals survive harsh winters. During hibernation, animals also lower their metabolic rate, heart rate, and breathing to conserve energy and survive in cold environments.
In summary, aestivation is similar to hibernation in that they are both states of dormancy with lowered metabolic activity, but aestivation occurs during the summer to help animals cope with hot and dry conditions.
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Animals that aestivate include reptiles, amphibians, and molluscs
Aestivation, derived from the Latin word 'aestivus' meaning summer, is a state of dormancy similar to hibernation, but occurring in the summer. Animals that aestivate enter a period of inactivity and lowered metabolic rate in response to high temperatures and arid conditions. This survival strategy is employed to sustain a lack of food and water, as well as other extreme conditions.
Reptiles, amphibians, and molluscs are among the animals that aestivate. Reptiles, such as the North American desert tortoise, have a relatively water-impermeable epidermis, which helps them retain water without forming a cocoon-like structure. Some amphibians, such as the cane toad, greater siren, and the California red-legged frog, aestivate during the hot and dry season by moving underground to cooler and more humid environments. They may also form cocoons composed of shed skin or mucus to reduce water loss.
Molluscs, specifically gastropods, are also known to aestivate. Land snails, including the milk snail or Otala lactea, native to Europe and Northern Africa, can aestivate by sealing their shells with a membrane of dried mucus called an epiphragm. This prevents water loss during dormancy. Other snail species, such as the Roman snail, will dig a hole and seal themselves inside with a layer of moss to survive extreme temperatures.
Aestivation is not limited to these groups, as both invertebrates and vertebrates, terrestrial and aquatic animals, have been observed to undergo this process. It is believed that aestivation evolved several hundred million years ago as a strategy to cope with hot, dry seasons.
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Aestivation is characterised by a lowered metabolic rate and inactivity
Aestivation, derived from the Latin aestivare, meaning "to spend the summer", is a state of dormancy characterised by lowered metabolic rates and inactivity. This survival strategy is employed by both invertebrates and vertebrates to endure high temperatures and arid conditions.
Aestivation is a response to the risk of desiccation, and the scarcity of food and water sources. Animals that aestivate enter a hypometabolic state, suppressing their metabolic rate and reducing macromolecule synthesis and degradation. This is achieved through an increase in antioxidant defences and chaperone proteins. The lowered metabolic rate also results in a decreased rate of water loss, enabling the animal to retain water in its body.
During aestivation, animals also conserve energy and ration the use of stored energy. This is particularly important for animals that aestivate over long periods, where hot temperatures and arid conditions may last for months or even years. For example, the western swamp turtle aestivates during the hot summers in the ephemeral swamps it inhabits. Lungfish can aestivate and survive without water for three years.
Aestivation is similar to hibernation, which is a state of dormancy and low metabolic activity during winter. However, aestivation is characterised by a lighter state of dormancy, as the animal's physiological state can be rapidly reversed, and it can quickly return to its normal state.
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Frequently asked questions
Aestivation, also known as "summer sleep", is a state of dormancy similar to hibernation but occurring in the summer.
Aestivation is a period of dormancy characterised by inactivity and a lowered metabolic rate. It is entered in response to high temperatures and arid conditions.
Invertebrates and vertebrates in both terrestrial and aquatic environments aestivate. Examples include earthworms, molluscs, arthropods, reptiles, amphibians, and more.
