Therefore, each population may be simultaneously employing characteristics of both an odor-gated rheotaxis
(Dusenbery, 1992) and a chemo-tropotaxis (Payne et al.
Individuals observed immediately upstream of the column showed no evidence of positive rheotaxis
but were foraging actively in all directions.
Flow speed has a dual effect on olfactory search by influencing plume dispersal and by providing a directional cue for the navigating organism via rheotaxis
(Bossert and Wilson 1963, Bell and Kramer 1979, Brown and Rittschof 1984, Weissburg and Zimmer-Faust 1993).
Previous studies considering flow direction as the only cue reported positive rheotaxis
in both the laboratory (Murray and Willows, 1996) and the field (Murray, unpubl.
Our goals were to learn whether positive rheotaxis
is continuous for T.
The lateral line functions in surface feeding, rheotaxis
, localization of underwater objects, and subsurface prey detection (1).
1997) provided experimental evidence that differential weighting, caused by the presence of spicules at the posterior end in some larvae, is correlated with positive geotaxis and rheotaxis
To run the experiments, the system was set with similar flow rates of clean seawater entering each side of the choice chamber, thus reducing any confounding effects of rheotaxis
Lobsters may be using one or a combination of two possible mechanisms to locate an odor source: (a) odor-gated rheotaxis
, which would cause the animal to move upstream, using the mean current for orientation once a chemical signal is detected (2), and (b) eddy-chemotaxis, which would require an animal to use the internal chemical and hydrodynamic fine structure of an odor plume to locate the source (3).
Odor gated rheotaxis
(OGR) (Kennedy, 1986) combines the guidance provided by two sensory modalities.
This is why many species of animals perform anemotaxis in air and rheotaxis
in water (Willis and Arbas, 1991; Dusenbery, 1992; Arbas et al.
A quantitative assessment of chemically mediated rheotaxis
in the asteroid, Coscinasterias tenuispina.