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Titolo:
Spontaneous heterosis in larval life-history traits of hemiclonal frog hybrids
Autore:
Hotz, H; Semlitsch, RD; Gutmann, E; Guex, GD; Beerli, P;
Indirizzi:
Univ Zurich Irchel, Museum Zool, CH-8006 Zurich, Switzerland Univ Zurich Irchel Zurich Switzerland CH-8006 H-8006 Zurich, Switzerland Univ Missouri, Div Biol Sci, Columbia, MO 65211 USA Univ Missouri Columbia MO USA 65211 Div Biol Sci, Columbia, MO 65211 USA Univ Washington, Dept Genet, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 n, Dept Genet, Seattle, WA 98195 USA
Titolo Testata:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
fascicolo: 5, volume: 96, anno: 1999,
pagine: 2171 - 2176
SICI:
0027-8424(19990302)96:5<2171:SHILLT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYBRIDOGENETIC RANA-ESCULENTA; GENETIC-VARIATION; SCAPHIOPUS-COUCHII; INTERSPECIES HYBRIDS; HYLA-GRATIOSA; WATER FROG; TADPOLES; METAMORPHOSIS; COMPLEX; POPULATIONS;
Keywords:
clonal reproduction; fitness; growth; interclonal selection; Rana esculenta;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
89
Recensione:
Indirizzi per estratti:
Indirizzo: Hotz, H Univerlandh Irchel, Museum Zool, Winterthurerstr 190, CH-8006 Zurich, Switz Univ Zurich Irchel Winterthurerstr 190 Zurich Switzerland CH-8006
Citazione:
H. Hotz et al., "Spontaneous heterosis in larval life-history traits of hemiclonal frog hybrids", P NAS US, 96(5), 1999, pp. 2171-2176

Abstract

European water frog hybrids Rana esculenta (Rana ridibunda x Rana lessonae) reproduce hemiclonally, transmitting only their ridibunda genome to gametes, We compared fitness-related larval life history traits of natural R. esculenta from Poland with those of the two sympatric parental species and ofnewly generated F-1 hybrids, Compared with either parental species, F-1 hybrid offspring had higher survival, higher early growth rates, a more advanced developmental stage by day 49, and earlier metamorphosis, but similar mass at metamorphosis. R, esculenta from natural lineages had trait values intermediate between those of F-1 offspring and of the two parental species. The data support earlier observations on natural R. esculenta that had faster larval growth, earlier metamorphosis, and higher resistance to hypoxic conditions compared with either parental species, Observing larval heterosis in F-1 hybrids in survival, growth rate, and time to metamorphosis, however, at an even higher degree than in hybrids from natural lineages, demonstrates that heterosis is spontaneous and results from hybridity per se rather than from subsequent interclonal selection; in natural lineages the effects of hybridity and of clonal history are confounded. This is compelling evidence for spontaneous heterosis in hybrid clonals, Results on hemiclonal fish hybrids (Poeciliopsis) showed no spontaneous heterosis; thus, our frog data are not applicable to all hybrid clonals, Our data do show, however, that heterosis is an important potential source for the extensively observedecological success of hybrid clonals. We suggest that heterosis and interclonal selection together shape fitness of natural R, esculenta lineages.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 22:12:49