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Titolo:
GENETIC-STRUCTURE OF COEXISTING SEXUAL AND CLONAL SUBPOPULATIONS IN AFRESH-WATER SNAIL (POTAMOPYRGUS-ANTIPODARUM)
Autore:
FOX JA; DYBDAHL MF; JOKELA J; LIVELY CM;
Indirizzi:
INDIANA UNIV,DEPT BIOL BLOOMINGTON IN 47405 INDIANA UNIV,DEPT BIOL BLOOMINGTON IN 47405 UNIV TURKU,ECOL ZOOL LAB FIN-20500 TURKU FINLAND
Titolo Testata:
Evolution
fascicolo: 4, volume: 50, anno: 1996,
pagine: 1541 - 1548
SICI:
0014-3820(1996)50:4<1541:GOCSAC>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
GENERAL-PURPOSE GENOTYPES; DAPHNIA-PULEX; WATER SNAIL; GEOGRAPHIC PARTHENOGENESIS; ARCTIC POPULATIONS; NEW-ZEALAND; DIVERSITY; HETEROGENEITY; REPRODUCTION; MAINTENANCE;
Keywords:
CLONAL DIVERSITY; FROZEN NICHE VARIATION HYPOTHESIS; GENERAL-PURPOSE GENOTYPE HYPOTHESIS; PARTHENOGENESIS; POTAMOPYRGUS ANTIPODARUM; SEXUAL REPRODUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
62
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Fox et al., "GENETIC-STRUCTURE OF COEXISTING SEXUAL AND CLONAL SUBPOPULATIONS IN AFRESH-WATER SNAIL (POTAMOPYRGUS-ANTIPODARUM)", Evolution, 50(4), 1996, pp. 1541-1548

Abstract

We examined clonal diversity and the distribution of both clonal and sexual genotypes in a single population of freshwater snails (Potamopyrgus antipodarum) in which diploid sexual individuals and triploid parthenogens coexist. A genetic analysis of individuals from three habitat zones in Lake Alexandrina, New Zealand revealed extremely high clonal diversity: 165 genotypes among 605 clonal individuals. The frequencyof triploid clonal individuals increased with increasing depth in thelake, and most of the individual clones were habitat specific, suggesting that differences among habitats are important in structuring the clonal subpopulation. There were also high levels of clonal diversity within habitats, suggesting frequent origins of habitat-specific clones. In contrast, diploid sexual individuals were proportionately more common in the shallow regions of the lake (where infection by trematodelarvae is highest), and there was no significant spatial structure inthe sexual subpopulation. We suggest that habitat specialization by clones, as well as parasite-mediated selection against common clones, are important factors affecting the structure of this mixed population of sexual and clonal snails.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 08:07:52