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Titolo:
GENETIC-ANALYSIS OF THE DORSAL LIGHT REACTION IN EPIGEAN AND CAVE-DWELLING ASTYANAX-FASCIATUS (TELEOSTEI CHARACIDAE)
Autore:
LANGECKER TG;
Indirizzi:
UNIV HAMBURG,INST ZOOL,LUTHER KING PL 3 W-2000 HAMBURG 13 GERMANY
Titolo Testata:
Ethology Ecology & Evolution
fascicolo: 3, volume: 5, anno: 1993,
pagine: 357 - 364
SICI:
0394-9370(1993)5:3<357:GOTDLR>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Keywords:
DORSAL LIGHT REACTION; REGRESSIVE EVOLUTION; NEUTRAL MUTATION THEORY; GENETIC ANALYSIS; CAVE FISH; ASTYANAX-FASCIATUS;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
T.G. Langecker, "GENETIC-ANALYSIS OF THE DORSAL LIGHT REACTION IN EPIGEAN AND CAVE-DWELLING ASTYANAX-FASCIATUS (TELEOSTEI CHARACIDAE)", Ethology Ecology & Evolution, 5(3), 1993, pp. 357-364

Abstract

The epigean characid Astyanax fasciatus developed a series of cave-dwelling populations in Central Mexico. The dorsal light reaction of theepigean fish was compared with that of a phylogenetically young cave population ('Micos' fish) and with that of the F1 and F2 hybrids between the epigean and a phylogenetically old cave form (Pachon' fish). The experiments revealed a slight regression of the dorsal light response in the Micos fish and an almost complete regression of this behaviour in the phylogenetically old Pachon population. A genetic analysis was performed. It suggests that the dorsal light behaviour of A. fasciatus is based on additive gene action, a minimum number of 3 to 6 genetic factors has been calculated to be involved in this system. The results are discussed with respect to the current controversy about the causes of regressive evolution. It is suggested that the observed regression of the dorsal light behaviour in the Pachon population is due to an accumulation of degenerative, selectively neutral mutations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 08:25:15