geotaxis

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geotaxis

[¦jē·ō¦tak·səs]
(physiology)
Movement of a free-living organism in response to the stimulus of gravity.
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Cragg & Crisp (1991) analyzed the results obtained by other authors and suggested that pectinid settlement is positively geotactic and negatively phototropic.
geotactic. Therefore, a shady, downhill region was created within the
Ctenophores, or comb jellies, are geotactic with a statocyst that controls the activity of the eight ciliary comb rows.
In response to the deflection of the balancers by the statolith, balancer beat frequency is modulated by calcium-dependent mechanotransduction (Lowe, 1997), and neural input only overrides the geotactic response or switches its sign (Lowe, 1997; Tamm, 1982, 2014a, b).
As both phototactic and geotactic behaviors are commonly reported for cercariae (Fingerut et al, 2003b; reviewed in Sukhdeo and Sukhdeo, 2004), subsequent ultrastructural studies on photoreceptors and statocysts, and neural mechanisms for their integration, are warranted.
However, activation of the circuitry must also provide an explanation for the elicitation of the negative geotactic response expressed in Hermissenda.
Lymnaea changes its geotactic behavior under specific conditions.
Negative geotactic behavior of Paramecium caudatum is completely described by the mechanism of buoyancy-oriented upward swimming.