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Titolo:
Diverging trends between heterozygosity and allelic richness during postglacial colonization in the European beech
Autore:
Comps, B; Gomory, D; Letouzey, J; Thiebaut, B; Petit, RJ;
Indirizzi:
INRA, Lab Genet & Ameliorat Arbres Forestiers, F-33611 Gazinet, France INRA Gazinet France F-33611 t Arbres Forestiers, F-33611 Gazinet, France Univ Bordeaux 1, Lab Ecol Genet, F-33405 Talence, France Univ Bordeaux 1 Talence France F-33405 ol Genet, F-33405 Talence, France Tech Univ Zvolen, Fac Forestry, SK-96053 Zvolen, Slovakia Tech Univ Zvolen Zvolen Slovakia SK-96053 try, SK-96053 Zvolen, Slovakia Inst Bot, F-34090 Montpellier, France Inst Bot Montpellier France F-34090 nst Bot, F-34090 Montpellier, France
Titolo Testata:
GENETICS
fascicolo: 1, volume: 157, anno: 2001,
pagine: 389 - 397
SICI:
0016-6731(200101)157:1<389:DTBHAA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
FAGUS-SYLVATICA L; GENETIC DIFFERENTIATION; SPATIAL DIFFERENTIATION; POPULATION BOTTLENECKS; LOCAL-POPULATIONS; DIVERSITY; RECOLONIZATION; VARIABILITY; CONSEQUENCES; CONSERVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Petit, RJ INRA, Lab Genet & Ameliorat Arbres Forestiers, BP 45, F-33611 Gazinet, France INRA BP 45 Gazinet France F-33611 P 45, F-33611 Gazinet, France
Citazione:
B. Comps et al., "Diverging trends between heterozygosity and allelic richness during postglacial colonization in the European beech", GENETICS, 157(1), 2001, pp. 389-397

Abstract

Variation at 12 polymorphic isozyme loci was studied in the European beechon the basis of an extensive sample of 389 populations distributed throughout the species range. Special emphasis was given to the analysis of the pattern of geographic variation on the basis of two contrasting measures of genetic diversity, gene diversity (II) and allelic richness, and to their relationship, Measures of allelic richness were corrected for variation in sample size by using the rarefaction method. As expected, maximum allelic richness was found in the southeastern part of the range (southern Italy and the Balkans), where beech was confined during the last ice age. Surprisingly, H was lower in refugia than in recently colonized regions, resulting in anegative correlation between the two diversity measures. The decrease of allelic richness and the simultaneous increase of FI during postglacial recolonization was attributed to several processes that differentially affect the two diversity parameters, such as bottlenecks due to long-distance founding events, selection during population establishment, and increased gene flow at low population densities.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:41:13