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Titolo:
The ageing of the low-frequency water disturbances caused by swimming goldfish and its possible relevance to prey detection
Autore:
Hanke, W; Brucker, C; Bleckmann, H;
Indirizzi:
Univ Bonn, Inst Zool, D-53115 Bonn, Germany Univ Bonn Bonn Germany D-53115 iv Bonn, Inst Zool, D-53115 Bonn, Germany Rhein Westfal TH Aachen, Aerodynam Inst, D-52062 Aachen, Germany Rhein Westfal TH Aachen Aachen Germany D-52062 , D-52062 Aachen, Germany
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 7, volume: 203, anno: 2000,
pagine: 1193 - 1200
SICI:
0022-0949(200004)203:7<1193:TAOTLW>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE IMAGE VELOCIMETRY; VORTEX RINGS; VELOCITY; FISH; WAKE; PIV;
Keywords:
lateral line; teleost; goldfish; Carassius auratus; hydrodynamics; particle image velocimetry; wake;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Hanke, W Univ Bonn, Inst Zool, Poppelsdorfer Schloss, D-53115 Bonn, Germany Univ Bonn Poppelsdorfer Schloss Bonn Germany D-53115 nn, Germany
Citazione:
W. Hanke et al., "The ageing of the low-frequency water disturbances caused by swimming goldfish and its possible relevance to prey detection", J EXP BIOL, 203(7), 2000, pp. 1193-1200

Abstract

Wakes caused by swimming goldfish (Carassius auratus) were measured with aparticle image velocimetry system and analyzed using a cross-correlation technique. Particle velocities in a horizontal plane (size of measuring plane 24cmx32cm or 20cmx27cm) were determined, and the vorticity in the plane was derived from these data. The wake behind a swimming goldfish can show a clear vortex structure for at least 30 s. Particle velocities significantlyhigher than background noise could still be detected 3 min after a fish (body length 10 cm) had passed through the measuring plane. Within this time span, the lateral spread of fish-generated wakes could exceed 30 cm for a 10 cm fish and 20 cm for a 6 cm fish. Measurements in a man-made open-air pond showed that water velocities in a quasi-natural still water environment can be as small as 1 mm s(-1) Background velocities did not exceed 3 mm s(-1) as long as no moving animal was present in the measuring plane. The possible advantage for piscivorous predators of being able to detect and analyze fish-generated wakes is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 04:19:46