Electronic Resource
Springer
Journal of comparative physiology
109 (1976), S. 59-68
ISSN:
1432-1351
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary 1. Some fishes show a tendency to orient their ventral side towards a substrate and may thus tilt considerably when swimming near vertical walls or even under the ceiling of caves. This behavior was named theVentral Substrate Response (VSR) and was quantitatively studied in the black croaker (Cheilotrema saturnum, Sciaenidae) and in the weakly electric fishEigenmannia sp. (Rhamphichthyidae). 2. It was determined that theVSR ofC. saturnum is visually guided and that a vertical substrate can induce a tilt of about 64° away from the vertical if illumination is from above (Fig. 2). TheVSR ofEigenmannia sp. can be totally or predominantly guided by the electric sense of these animals and can induce ca. 30° tilt to a 45° tilted bottom (Fig. 4). 3. The amount of tilt displayed is dependent on the distance between the animal and the substrate. Measurable tilt responses inC. saturnum were observed up to a distance of 15 cm. 4. In a second experiment interactions between theDorsal Light Response (DLR) and theVSR were investigated inC. saturnum. It was found that tilt responses induced during aDLR or aVSR can add to each other when having the same direction or can subtract from one another, if opposite in direction. This experiment demonstrates the independence of theVSR- and theDLR-mechanisms. 5. After bilateral forebrain ablationC. saturnum did not show aVSR anymore. ADLR was still performed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00663435
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