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Titolo:
EVOLUTION OF THE OPTICAL RELEASERS FOR AGGRESSIVE-BEHAVIOR IN CAVE-DWELLING ASTYANAX-FASCIATUS (TELEOSTEI, CHARACIDAE)
Autore:
LANGECKER TG; NEUMANN B; HAUSBERG C; PARZEFALL J;
Indirizzi:
UNIV HAMBURG,ZOOL INST & MUSEUM,MARTIN LUTHER KING PL 3 D-20146 HAMBURG GERMANY HUMBOLDT UNIV BERLIN,INST VERHALTENSBIOL & ZOOL D-10115 BERLIN GERMANY
Titolo Testata:
Behavioural processes
fascicolo: 2, volume: 34, anno: 1995,
pagine: 161 - 167
SICI:
0376-6357(1995)34:2<161:EOTORF>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEXICANUS CHARACIDAE; PISCES; POPULATION; FISH;
Keywords:
AGGRESSIVE BEHAVIOR; RELEASER; EVOLUTION; CAVE-FISH; ASTYANAX FASCIATUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
T.G. Langecker et al., "EVOLUTION OF THE OPTICAL RELEASERS FOR AGGRESSIVE-BEHAVIOR IN CAVE-DWELLING ASTYANAX-FASCIATUS (TELEOSTEI, CHARACIDAE)", Behavioural processes, 34(2), 1995, pp. 161-167

Abstract

Epigean and blind cave-dwelling populations of the characid Astyanax fasciatus differ in their agonistic behavior. Epigean specimens are characterized by intense aggressive behavior and territoriality in the laboratory, whereas the blind cave fishes are rarely aggressive and have totally lost the territorial behavior. These behavioral changes are genetically based. In the present study, a comparative analysis of theoptical releasers for aggressive behavior has been performed in both epigean and cave-dwelling populations. It was expected that the regression of aggressive behavior should be accompanied by the regression ofthe genetically fixed optical releasers for aggression in the cave specimens. For the analysis of cave fishes, well-eyed F-1-hybrids of cave and epigean specimens (Pachon X Teapao) as well as phylogenetically young cave specimens (Micos) selected for large eyes, have been used. In epigean specimens, aggression is most intensely released by a combination of the signals 'natural shape' and 'locomotion'. The cave populations exhibit a partial regression of the releaser 'natural shape'. 'Locomotion', however, has become a more effective releaser for aggression in cave fishes than it has in their epigean relatives. The resultsare discussed with respect to their evolutionary significance.

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Documento generato il 13/07/20 alle ore 10:54:50