Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Differential performance among LDH-B genotypes in Rana lessonae tadpoles
Autore:
Hotz, H; Semlitsch, RD;
Indirizzi:
Univ Zurich, Zool Museum, CH-8006 Zurich, Switzerland Univ Zurich ZurichSwitzerland CH-8006 seum, CH-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
Titolo Testata:
EVOLUTION
fascicolo: 5, volume: 54, anno: 2000,
pagine: 1750 - 1759
SICI:
0014-3820(200010)54:5<1750:DPALGI>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANURAN SCAPHIOPUS-COUCHII; LIFE-HISTORY TRAITS; GENETIC-VARIATION; ESCULENTA COMPLEX; FUNDULUS-HETEROCLITUS; NATURAL-SELECTION; HYLA-GRATIOSA; GROWTH-RATE; ANTAGONISTIC PLEIOTROPY; PSEUDACRIS-TRISERIATA;
Keywords:
balancing selection; fitness larval stage; LDH-B polymorphism; metamorphosis; nonneutral evolution; Rana lessonae;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
106
Recensione:
Indirizzi per estratti:
Indirizzo: Hotz, H Univ Zurich, Zool Museum, Winterthurerstr 190, CH-8057 Zurich, Switzerland Univ Zurich Winterthurerstr 190 Zurich Switzerland CH-8057 erland
Citazione:
H. Hotz e R.D. Semlitsch, "Differential performance among LDH-B genotypes in Rana lessonae tadpoles", EVOLUTION, 54(5), 2000, pp. 1750-1759

Abstract

The European pool frog, Rana lessonae, is widely polymorphic for two common alleles (b, e) at the lactate dehydrogenase-B (LDH-B) locus. We compared fitness-related larval life-history traits among LDH-B genotypes, which originated from segregation in heterozygous parents, in an artificial pond experiment where tadpoles of R. lessonae from a Swiss population were raised together with tadpoles of the hemiclonal hybrid R, esculenta at two densities. In R. lessonae, LDH-B e/e homozygotes at each density had a higher proportion of metamorphs among survivors, reached metamorphosis earlier, and were heavier at metamorphosis than b/b homozygotes; b/e heterozygotes had intermediate values. That e/e individuals were superior to b/b in both time to and mass at metamorphosis is surprising because these two life history traits are thought to reflect a performance trade-off; e/e genotypes apparentlycompensated for shorter time to metamorphosis by a higher growth rate. Thetwo alleles showed the same performance ranking when combined in hybrids with a R. ridibunda allele: When R. esculenta from Swiss populations reared in the same ponds had received the e allele rather than the b allele from their R. lessonae parent, they reached metamorphosis earlier, but did not differ in mass at metamorphosis. The degree of linkage disequilibrium in the source population of the eight R. lessonae used as parents of the R. lessonae tadpoles is unknown, so we cannot exclude the possibility that the performance differences are caused by some anonymous tightly linked gene, ratherthan the LDH-B locus, that constitutes the genomically localized target ofnatural selection. A causal involvement of LDH-B is plausible, nevertheless, because this enzyme takes part in the central energy-metabolizing processes and has been reported to underlie fitness differences in other animals;also, differential performance of LDH-B genotypes has been observed in R. lessonae larvae from another population. The present results suggest strongdirectional selection for allele e; the sum of available data, including an independent laboratory experiment, suggests that partial environment-dependent overdominance combined with balancing selection favoring e/e homozygotes under some and b/b homozygotes under other conditions may be partially responsible for the broad maintenance of the LDH-B polymorphism in R. lessonae.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:33:35