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Titolo:
BLIND MEXICAN CAVE FISH (ASTYANAX-HUBBSI) RESPOND TO MOVING VISUAL-STIMULI
Autore:
TEYKE T; SCHAERER S;
Indirizzi:
UNIV MAINZ,INST ZOOL BIOPHYS 3 D-55099 MAINZ GERMANY
Titolo Testata:
Journal of Experimental Biology
, volume: 188, anno: 1994,
pagine: 89 - 101
SICI:
0022-0949(1994)188:<89:BMCF(R>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANOPTICHTHYS-JORDANI; PHOTORECEPTORS;
Keywords:
OPTOMOTOR RESPONSE; EXTRA-OCULAR PHOTORECEPTORS; ENVIRONMENTAL CONSTRAINTS; CAVE FISH; ASTYANAX HUBBSI;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
T. Teyke e S. Schaerer, "BLIND MEXICAN CAVE FISH (ASTYANAX-HUBBSI) RESPOND TO MOVING VISUAL-STIMULI", Journal of Experimental Biology, 188, 1994, pp. 89-101

Abstract

In apparatus for measuring optomotor behaviour, blind Mexican cave fish, Astyanax hubbsi, increase their swimming velocity upon rotation ofa striped cylinder, i.e. in response to a solely visual stimulus. Thefish follow the movements of the stripes at (i) rotation velocities between 60 degrees s(-1) and 80 degrees s(-1), (ii) light intensities of less than 201x and, (iii) stimulus widths subtending an angle of less than 1 degrees. Extirpation of the vestigial eye structures does notaffect the response to the moving visual stimulus, which indicates that the response is mediated by extra-ocular photoreceptors. An optomotor response can be reliably evoked in a round test aquarium. Fish do not respond when the test aquarium contains environmental cues, such asbars on the wall or when a section of the round aquarium is divided off. This indicates that the fish obtain information about their environment from different sensory sources and that the visual stimulus is effective only when no other means of orientation are available. We suggest a modified theory of the optomotor response, which emphasizes thecrucial role of the environment in eliciting the response and which permits behaviours more complex than just following the stimulus.

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Documento generato il 04/07/20 alle ore 04:42:07