(from the Latin word aestas, meaning summer) is a state of summer sleep'' or dormancy, resorted to by many animals during times of extremely high temperatures and drought.
The adaptive advantage of estivation
is that it economizes water and reduces energy loss.
Aquatic turtles not only use upland habitats for nesting, but also for winter hibernation, summer estivation
, and movement from unsuitable aquatic habitats (Gibbons 1986, Buhlmann 1995).
2014), and type 2-like AQP (AQP0p) is expressed in the kidney of lungfish Protopterus annectens Owen, 1839 during terrestrial estivation
(Konno et al.
Response to drought conditions depends largely on whether a species evolved in an arid or a humid environment; species with arid climate evolutionary histories have behavioral adaptations, such as estivation
, to cope with dry conditions, whereas those that did not evolve in an arid or xeric climate must emigrate (Gibbons et al.
When temperatures become unbearable, they use clawed front feet to dig burrows and eventually enter a state known as estivation
, their metabolism slowed and systems all but shut down.
For example, during estivation
, the mouth of the shell of desert snails is closed by a thick epiphragm of calcified slime, which reduces water loss by evaporation so much that some desert snails can remain dormant for five years and revive when wetted.
studies of the convergent lady beetle in Arkansas.
This low wealth during the months of June, July and August can be explained by estivation
of snails for the purpose of protect themselves from desiccation due to high temperatures and intense sunshine during that season.
Lungfish curl from the tail first with the snout pointing upward in estivation
burrows (Johnels and Svennson, 1954; Greenwood, 1986).
In freshwater turtles, responses to drought may include subterranean estivation
, particularly by relatively small-bodied species, or overland migration to larger and less ephemeral habitats (Gibbons et al.
The plants turn green again, and ground squirrels and tortoises awake from their estivation