geotaxis


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Related to geotaxis: thermotaxis

ge·o·tax·is

 (jē′ō-tăk′sĭs)
n.
Movement of a motile organism using the earth's gravity for orientation.

ge′o·tac′tic (-tĭk) adj.
ge′o·tac′ti·cal·ly adv.

geotaxis

(ˌdʒiːəʊˈtæksɪs)
n
(Biology) movement of an organism in response to the stimulus of gravity
ˌgeoˈtactic, ˌgeoˈtactical adj
ˌgeoˈtactically adv

ge•o•tax•is

(ˌdʒi oʊˈtæk sɪs)

n.
oriented movement of a motile organism toward or away from a gravitational force.
[1960–65]
ge`o•tac′tic (-tɪk) adj.
ge`o•tac′ti•cal•ly, adv.

geotaxis

the movement of an organism in response to the force of gravity.
See also: Gravity, Motion
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References in periodicals archive ?
GEOTAXIS A Organism's response to gravity B Earth pressure C Solid part of the earth who am I?
depressus, a dominant member of oyster reef communities in Southwest Florida, exhibited negative geotaxis and a high degree of barokinesis; these authors suggested that this combination of behavioral responses should allow for precise depth regulation and might facilitate tidal stream transport.
The following reflex tests were assessed in all pups from each litter: surface righting reflex (a normal ventral position assumed after the animal is placed on its back, observed for 15 s, postnatal days 2 to 7), negative geotaxis (to turn at least 90, after being placed face-down in a platform inclined at 45; the maximum time allowed for the pup to turn was 30 s, PD 7 to PD 12), and grasping reflex (registering the day of absence of involuntary bending of the fingers in response to tactile stimulation on the palm, PD2 to PD12).