The behavioral basis of larval recruitment in the crab Callinectes sapidus Rathbun: a laboratory investigation of ontogenetic changes in geotaxis
The righting reflex, negative geotaxis
and grip strength tests showed no statistical differences when the treated groups were compared with the control group GC- (P>0.05).
There were no significant differences between group conditions (sham or carotid) or between treatments (saline, Grx2, or Trx1 administration) for the tasks evaluating surface righting reflex, negative geotaxis
, crossed extensor reflex, ear twitching, auditory startle, and ear unfolding (see Supplementary Figure 1 available online at https://doi.org/10.1155/2017/4162465).
However, the impact of interventions on health span is commonly evaluated by means of motor performance test such as spontaneous motor activity and the geotaxis
Temperature changes also produce measurable alterations in the directional responses to light (phototaxis) and gravity (geotaxis
), and the activity of crustacean larvae in general .
Other model organisms that have been used to demonstrate choice include fruit flies (geotaxis
) and crayfish (sand vs.
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.
Rats were observed from postnatal day 1 to 25 for the age of the appearance of physiological markers (pinna detachment, inscisor's eruption, eye opening) and acquisition of reflexes (surface righting, visual placing, reflex suspension, negative geotaxis
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.
The coastal snail also has a negative geotaxis
: it will crawl up, away from the earth, if given the opportunity.