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The tree cricket Oecanthus fultoni. Dolbear's law states the relationship between the air temperature and the rate at which crickets chirp. [1] [2] It was formulated by physicist Amos Dolbear and published in 1897 in an article called "The Cricket as a Thermometer". [3]
Oecanthus fultoni's common name of the thermometer cricket is derived from a relationship between the rate of its chirps and the temperature. An estimate of the temperature in Fahrenheit can be made by adding 40 to the number of chirps made in 15 seconds. [3] Before 1960, the name Oecanthus niveus was wrongly applied to this species. [4]
An aggressive song is triggered by contact chemoreceptors on the antennae that detect the presence of another male cricket. [9] Crickets chirp at different rates depending on their species and the temperature of their environment. Most species chirp at higher rates the higher the temperature is (about 62 chirps a minute at 13 °C (55 °F) in ...
Gryllus veletis, commonly known as the spring field cricket, is abundant throughout eastern North America. G. veletis is a solitary, aggressive, omnivorous, burrow-inhabiting species of cricket . This species is commonly confused with Gryllus pennsylvanicus (fall field cricket), as they inhabit the same geographical area.
Oecanthus capensis, the Cape thermometer cricket, is a species of tree cricket (Subfamily Oecanthinae). [2] It has been found that the rate at which these crickets chirp follows Dolbear's law . [ 3 ]
The chirp (or trill) of a tree cricket is long and continuous and can sometimes be mistaken for the call of a cicada or certain species of frogs. While male tree crickets have the ability to call, females lack the ability. [5] This call is then received by other tree crickets in the area through a system called sender-receiver matching.
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Dolbear's law is an empirical relationship between temperature and the rate of cricket chirping. Dollo's law: "An organism is unable to return, even partially, to a previous stage already realized in the ranks of its ancestors." Simply put this law states that evolution is not reversible; the "law" is regarded as a generalisation as exceptions ...