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    Author(s): Sheryl Coombs; Gary D. Grossman
    Date: 2006
    Source: Marine and Freshwater Behaviour and Physiology, Vol. 39(2): 113-130
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.39 MB)

    Description

    We compared prey-orienting and rheotactic behaviors in a fluvial (Coweeta Creek) and lacustrine (Lake Michigan) population of mottled sculpin. Blinded sculpin from both populations exhibited unconditioned, mechanosensory based rheotaxis to low velocity flows. Whereas Lake Michigan sculpin generally showed increasing levels of positive rheotaxis to increasing velocities, Coweeta Creek sculpin show varying levels of positive rheotaxis at low to intermediate velocities and often reduced positive rheotaxis or even negative rheotaxis at the highest velocities (12 cms-1). Blinded Lake Michigan, but not Coweeta Creek mottled sculpin exhibited an orienting response to a small (3 mm diameter) artificial prey (50 Hz vibrating sphere). In conclusion, the two populations differed in the strength and polarity of the rheotactic response at higher velocities and in their responsiveness to mechanosensory cues from epibenthic prey sources. These behavioral differences have most likely arisen from different learning experiences in different habitats and from the greater importance of visual cues to the Coweeta Creek mottled sculpin and mechanosensory cues to Lake Michigan mottled sculpin in the sensory guidance of orienting behaviors.

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    Citation

    Coombs, Sheryl; Grossman, Gary D. 2006. Mechanosensory based orienting behaviors in fluvial and lacustrine populations of mottled sculpin (Cottus bairdi). Marine and Freshwater Behaviour and Physiology, Vol. 39(2): 113-130

    Keywords

    Rheotaxis, prey orientation, lateral line, habitat selection, stream fish, lake fish

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