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Aestivation (Latin: aestas (summer); also spelled estivation in American English) is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. [ 1 ]
Aestivation is also sometimes referred to as praefoliation or prefoliation, but these terms may also mean vernation: the arrangement of leaves within a vegetative bud. Aestivation can be an important taxonomic diagnostic; for example Malvaceae flower buds have valvate sepals, with the exception of the genera Fremontodendron and Chiranthodendron ...
Aestivation, also spelled estivation, is an example of consequential dormancy in response to very hot or dry conditions. It is common in invertebrates such as the garden snail and worm but also occurs in other animals such as lungfish , salamanders , desert tortoises , and crocodiles .
Four different mechanisms of pollen release are known in papilionaceous flowers, which are respectively known as the explosive, valvular, piston and brush mechanisms. [7] In the explosive or tripping mechanism ( cf. alfalfa , common broom , ox-eye bean [ 8 ] ) all pollen is instantly released when pressure on the staminal column is permanently ...
Aestivation may refer to: Aestivation, a state of animal dormancy, similar to hibernation; Aestivation (botany), the positional arrangement of the parts of a flower within a flower bud before it has opened; Aestivation hypothesis, a hypothesized solution to the Fermi paradox
In Crete this species is active for 3–4 months after the first rainfalls in October. It aestivates buried relatively deep in the soil. [3] In hot, dry weather, it burrows three to six inches [citation needed] into the ground and becomes dormant until rain softens the soil. A white convex epiphragm is created for aestivation. [3]
If an organ is absent, its number is written as "0" or it is omitted, if there are "many" (usually more than 10–12) instances, it can be written as "∞". Whorls of the same organ are separated by "+". Organ counts within a whorl can be separated by ":", for example when part of the whorl is morphologically different.
The snail's quiescent periods during heat and drought are known as aestivation; its quiescence during winter is known as overwintering. When overwintering, Cornu aspersum avoids the formation of ice in its tissues by altering the osmotic components of its blood (or haemolymph ); this permits it to survive temperatures as low as −5 °C (23 °F ...