geotaxis


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Related to geotaxis: thermotaxis

geotaxis

[¦jē·ō¦tak·səs]
(physiology)
Movement of a free-living organism in response to the stimulus of gravity.
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References in periodicals archive ?
minutus leads to reversed geotaxis, with gam-marid individuals staying closer to the water surface than the uninfected ones (Bauer et al.
The experimental rats were determined negative geotaxis by placing them on a 45[degrees] slope with its head pointing down the decline.
Very low doses of the chemicals together delayed ear opening, affected geotaxis, and reduced grip strength.
In the pre-weaning stage, control offspring mastered open field assessment and negative geotaxis earlier than growth restricted offspring.
To our knowledge, Murphey and Hall (1969) were the first to show that flies selected for negative geotaxis exhibited some physiological adaptation to the dry, plastic environment of a maze, that is, lower locomotor activity and lower mortality in absence of food.
As a consequence of positive phototaxis and/or negative geotaxis, these predators climb vertically on rocky surfaces upon submergence by a flooding tide (Yoshida and Ohtsuki, 1968; Underwood, 1979; Vadas et al.
The locomotor performance of the flies fed with a RD and a HFD was investigated using the negative geotaxis test, according to Coulom and Birman [19], with minor modifications.
En su trabajo Bonilla-Ramirez y col demuestran que la intoxicacion con cobre, hierro y manganeso es capaz de inducir mortalidad y una disminucion del desempeno motor en la prueba de geotaxis.
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.
Shanks (2002) senala que la presencia de zooplancteres en la superficie del mar, ademas de ser afectada por procesos de circulacion o forzamientos, se debe a comportamientos que los mantienen en superficie, como la baroquinesis, fototaxis positiva, geotaxis negativa, alta tigmoquinesis (tendencia a adherirse a objetos) o velocidades de nado sostenido, lo cual tendria directa relacion con habilidades sensoriales dependientes de estados ontogeneticos y morfologia (Kingsford et al.