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Titolo:
Extraordinary multilocus genetic organization in mole crickets, Gryllotalpidae
Autore:
Nevo, E; Beiles, A; Korol, AB; Ronin, YI; Pavlicek, T; Hamilton, W;
Indirizzi:
Univ Haifa, Inst Evolut, IL-31905 Haifa, Israel Univ Haifa Haifa Israel IL-31905 fa, Inst Evolut, IL-31905 Haifa, Israel Univ Oxford, Dept Zool, Oxford OX1 3PS, England Univ Oxford Oxford England OX1 3PS d, Dept Zool, Oxford OX1 3PS, England
Titolo Testata:
EVOLUTION
fascicolo: 2, volume: 54, anno: 2000,
pagine: 586 - 605
SICI:
0014-3820(200004)54:2<586:EMGOIM>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROGEOGRAPHIC EDAPHIC DIFFERENTIATION; HETEROGENEOUS ENVIRONMENTS; NATURAL-POPULATIONS; MOLECULAR EVOLUTION; WILD BARLEY; POLYMORPHISM; SPECIATION; PATTERNS; ISRAEL; SPALAX;
Keywords:
habitat choice; Hardy-Weinberg equilibrium; heterozygosity; linkage disequilibrium; mate choice; polymorphism; selection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Nevo, E Univ Haifa, Inst Evolut, IL-31905 Haifa, Israel Univ Haifa HaifaIsrael IL-31905 Evolut, IL-31905 Haifa, Israel
Citazione:
E. Nevo et al., "Extraordinary multilocus genetic organization in mole crickets, Gryllotalpidae", EVOLUTION, 54(2), 2000, pp. 586-605

Abstract

Allozymic diversity at 21 loci was analyzed in 370 individuals of three species of mole cricket superspecies, Gryllotalpa gryllotalpa (two new chromosomal species, G. tall and G. marismortui) and G. africana in Israel, whichare distributed along a southward transect of increasing aridity. Two outstanding findings emerged in G. tali and G. marismortui: (1) genetic polymorphism was high but heterozygosity very low, indicating significant deviations from Hardy-Weinberg expectations; and (2) significant linkage disequilibria at an unprecedented level for outbreeders and remarkable intersite differences. The results may characterize subterranean gryllotalpids worldwide because a single sample of Neocurtilla hexadactyla from Tefe, Amazonia, shows the same features. Significant variation of heterozygote paucity among loci, combined with the biology of the species, rejects the simple explanation of inbreeding or any other single explanatory model. Likewise, direct selection against heterozygotes or specific multilocus associations can explain, but is not necessary nor likely to explain, the observed results in mole crickets. To explain these results, we developed a multiple-factor mathematical model combining niche viability selection, niche choice, and positive assortative mating. This model involves a special case of Wahlund effect and inbreeding. Simulations based on this model showed that a combination of these three mechanisms may produce the observed distribution of alleles, via selection on a few loci, to affect the entire genome organization.

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Documento generato il 21/09/20 alle ore 06:37:15