(Positive) Rheotaxis is a form of taxis seen in many aquatic organisms, e.g., fish, whereby they will (generally) turn to face into an oncoming current. This has been noted in zebrafish and other species. In a flowing stream, this behavior leads them to hold position in a stream rather than being swept downstream by the current. In fish that exhib...
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http://en.wikipedia.org/wiki/Rheotaxis
direction of movement by water
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http://phrontistery.info/r.html
(from the article `mechanoreception`) ...as possible in contact with solid objects in the surroundings (thigmotaxis). Animals that live in running water usually maintain their position as ...
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http://www.britannica.com/eb/a-z/r/43
<cell biology> Tactic response taxis to the direction of flow of a fluid. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
(re″o-tak´sis) orientation of an organism in a stream of liquid, with its long axis parallel with the direction of flow, designated negative (moving in the same direction) or positive (moving in the opposite direction).
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A taxis in response to the direction of flow of a fluid.
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Type: Term Pronunciation: rē′ō-tak′sis Definitions: 1. A form of positive barotaxis, in which a microorganism in a fluid is impelled to move against the current flow of its medium.
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http://www.medilexicon.com/medicaldictionary.php?t=78190
rheotaxis, rheotactic The orientation of an organism in a stream of liquid or air current, with its long axis parallel with the direction of fluid flow. Negative rheotaxis refers to the movement of the organism in the same direction as that of the liquid (current); positive rheotaxis refers to the movement of the organism in the opposite direction...
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http://www.wordinfo.info/words/index/info/view_unit/1845/3
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