Most aquatic animals have hydrodynamic receptor systems (Bleckmann, 1994). They use these systems for rheotaxis (Baker and Montgomery, 2002), the detection of surface waves (Bleckmann et al., 1989), and the detection of midwater hydrodynamic events such as those caused by predators, conspecifics or...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.612.3320 http://jeb.biologists.org/content/207/9/1585.full.pdf |
| Summary: | Most aquatic animals have hydrodynamic receptor systems (Bleckmann, 1994). They use these systems for rheotaxis (Baker and Montgomery, 2002), the detection of surface waves (Bleckmann et al., 1989), and the detection of midwater hydrodynamic events such as those caused by predators, conspecifics or prey (Bleckmann, 1994). Harbour seals Phoca vitulina can track hydrodynamic trails of moving objects with their vibrissae over a distance where vision and hearing should fail (Dehnhardt et al., 2001). European catfish Silurus glanis can follow the swim paths of their prey, which suggests hydrodynamic or chemical trail-following (Pohlmann et al., 2001). Despite recent advances in the investigation of the behavioural functions of the lateral line and the peripheral and central processing of hydrodynamic sensory information by fish (e.g. Bleckmann et al., 2001), and the sensory abilities of seals (Dehnhardt et al., 2001), data on the information contained in animal-caused water motions, i.e. their frequency content, three-dimensional extension and especially their ageing, are still rare. In this study, we used scanning digital particle image velocimetry (S-DPIV) to measure the hydrodynamic trails caused by swimming fish of three teleost species. While classical digital particle image velocimetry (DPIV) measures velocities in a single layer of fluid illuminated by a laser light sheet (Adrian, 1991; Westerweel, 1997; Drucker and Lauder, 2001, 2003), S-DPIV measures velocities in multiple layers using one measurement, by scanning the laser light through various planes. The result is an extension of the velocity information from a single layer to a volume. DPIV has been applied to the water motions caused by moving animals (Stamhuis and Videler, 1995; Müller et al., 1997, 2000; Drucker and Lauder, 2000, 2001). Drucker and Lauder (1999) reconstructed three-dimensional information from successive two-dimensional PIV measurements. Nauen and Lauder (2002) measured three-dimensional velocity information in a water layer behind a ... |
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