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Titolo:
A study of fluctuating asymmetry in hybrids of dwarf and normal lake whitefish ecotypes (Coregonus clupeaformis) from different glacial races
Autore:
Lu, GQ; Bernatchez, L;
Indirizzi:
Univ Laval, Dept Biol, GIROQ, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 ol, GIROQ, St Foy, PQ G1K 7P4, Canada
Titolo Testata:
HEREDITY
, volume: 83, anno: 1999,
parte:, 6
pagine: 742 - 747
SICI:
0018-067X(199912)83:<742:ASOFAI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYMPATRIC STICKLEBACKS GASTEROSTEUS; DEVELOPMENTAL STABILITY; GENOMIC COADAPTATION; ONCORHYNCHUS-NERKA; MITOCHONDRIAL-DNA; SALMONID FISHES; SOCKEYE-SALMON; EVOLUTION; HETEROZYGOSITY; POPULATIONS;
Keywords:
fluctuating asymmetry; hybrids; reproductive isolation; speciation; sympatric ecotypes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Bernatchez, L Univ Laval, Dept Biol, GIROQ, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 Foy, PQ G1K 7P4, Canada
Citazione:
G.Q. Lu e L. Bernatchez, "A study of fluctuating asymmetry in hybrids of dwarf and normal lake whitefish ecotypes (Coregonus clupeaformis) from different glacial races", HEREDITY, 83, 1999, pp. 742-747

Abstract

Fish ecotypes found in north temperate lakes are increasingly used as model organisms to explore patterns and processes of population divergence thatmay ultimately cause speciation. Processes involved in their reproductive isolation are, however, still poorly understood. Recent experimental studies on whitefish ecotypes from different glacial races revealed that embryonic mortality of hybrids was 2.4-4.7 times higher than for parental forms. Tnthis study, we compared fluctuating asymmetry (FA) in morphological traitsof these same hybrid and pure crosses to test the hypothesis that genetic stress observed in hybrids at embryonic stages is also manifested at later developmental stages. Twelve morphological traits were used to measure asymmetry. Variable degrees of asymmetry were observed depending on traits and crosses, however there was no significant difference in FA among crosses. These results thus provided no evidence in support of the working hypothesisand indicated that genetic stress may differ among life stages. Tt is morelikely that high hybrid embryonic mortality acts together with ecological factors at later stages to increase further the extent of reproductive isolation between sympatric whitefish ecotypes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/04/20 alle ore 02:35:59