geotaxis

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geotaxis

 [je″o-tak´sis]
taxis in response to gravity; movement influenced by gravity.

ge·o·tax·is

(jē'ō-tak'sis),
A form of positive barotaxis in which there is a tendency to growth or movement toward or into the earth.
Synonym(s): geotropism
[geo- + G. taxis, orderly arrangement]

geotaxis

(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

a type of animal movement (not growth) in which the body becomes orientated in relation to the force of gravity. For example, fruit flies exhibit negative geotaxis, moving upwards in the culture bottle, away from the gravitational force.

geotaxis

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References in periodicals archive ?
2012) and pressure receptors (Tamm, 1982), with possible influences on geotactic mood.
My aim was to discover whether these bilateral asymmetries in statocyst architecture affect the function of the statocyst during geotactic behavior of ctenophores.
Changes in geotactic sign are often accompanied by variations in beat frequencies and transient irregular activities of the imaged comb rows.
All of the animals that displayed a consistent sign of geotaxis during the tilting experiments and were used for analysis of beat frequencies were negatively geotactic.
At the initial orientation (0[degrees]) of a negatively geotactic Mnemiopsis in the cteno-tilter with the oral-aboral axis vertical and the aboral pole (statocyst) facing up, only occasional waves of beating were seen on all eight comb rows, as described previously for Pleurobrachia and Beroe in an up mood (Tamm, 1980, 1982).
Odor becomes a stimulus that releases geotactic orientation behavior, which frees the animal from having to perform complex processing to extract gradient information from the chemical signal itself.
californianus larvae, however, do not have eyespots and show no obvious photobehavior in response to vertically or horizontally directed lights; their vertical swimming behaviors are probably geotactic.