It can also float by itself or on mats of " Cladophora " spp ., and move 60 m upstream in 3 months through positive rheotactic behavior.
2.
The most pronounced effect of temperature in liquid is convection, which raised the concern that the apparent thermotactic response could have been a reflection of a passive drift in the liquid current or a rheotactic response to the current ( rather than to the temperature gradient per se ).
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