Gravitaxis is a form of taxis characterized by the directional movement of an organism in response to gravity. Gravitaxis is one of the many forms of taxis. It is characterized by the movement of an organism in response to gravitational forces. It is sometimes called geotaxis.
Gravitaxis is different from gravitropism in a way that the latter is more about the growth response of an organism to gravity.
Taxis is a behavioral response of a cell or an organism to an external stimulus. The movement is characteristically directional. The movement may be positive or negative. A positive taxis is one in which the organism or a cell moves towards the source of stimulation (attraction). A negative taxis is when the organism or a cell moves away from the source of stimulation (repulsion).
It can be seen in many microorganisms including Euglena. The response of planktonic larvae of Lithodes aequispinus (king crab) to gravity is another example of gravitaxis. They show both positive and negative gravitaxes in a way that they move either upward (negative) or downward (positive). Gravitaxis can also be observed in Drosophila.
- "Gravitaxis - Biology-Online Dictionary". Retrieved 25 March 2018.
- Adams, C. F.; Paul, A. J. (February 1999). "Phototaxis and Geotaxis of Light-Adapted Zoeae of the Golden King Crab Lithodes aequispinus (Anomura: Lithodidae) in the Laboratory". Journal of Crustacean Biology. 19 (1): 106. doi:10.2307/1549552. JSTOR 1549552.
- Häder, DP; Hemmersbach, R (2017). "Gravitaxis in Euglena". Advances in Experimental Medicine and Biology. 979: 237–266. doi:10.1007/978-3-319-54910-1_12. PMID 28429325.
- Armstrong, JD; Texada, MJ; Munjaal, R; Baker, DA; Beckingham, KM (April 2006). "Gravitaxis in Drosophila melanogaster: a forward genetic screen". Genes, brain, and behavior. 5 (3): 222–39. doi:10.1111/j.1601-183X.2005.00154.x. PMID 16594976.
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