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Titolo:
FACTORS CONTRIBUTING TO THE MAINTENANCE OF THE GENETIC-POLYMORPHISM AT THE LOCUS LDH-B IN THE POOL FROG, RANA-LESSONAE
Autore:
SCHMIDT BR; HOTZ H; ANHOLT BR; GUEX GD; SEMLITSCH RD;
Indirizzi:
UNIV BASEL,INST ZOOL,RHEINSPRUNG 9 CH-4051 BASEL SWITZERLAND UNIV ZURICH,INST ZOOL CH-8057 ZURICH SWITZERLAND UNIV ZURICH,MUSEUM ZOOL CH-8057 ZURICH SWITZERLAND UNIV MISSOURI,DIV BIOL SCI COLUMBIA MO 65211
Titolo Testata:
Canadian journal of zoology
fascicolo: 5, volume: 76, anno: 1998,
pagine: 795 - 804
SICI:
0008-4301(1998)76:5<795:FCTTMO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIFE-HISTORY TRAITS; ANTAGONISTIC PLEIOTROPY; PHENOTYPIC PLASTICITY; NATURAL-SELECTION; ESCULENTA COMPLEX; ANURAN LARVAE; GROWTH; ENVIRONMENT; POPULATIONS; ADAPTATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
B.R. Schmidt et al., "FACTORS CONTRIBUTING TO THE MAINTENANCE OF THE GENETIC-POLYMORPHISM AT THE LOCUS LDH-B IN THE POOL FROG, RANA-LESSONAE", Canadian journal of zoology, 76(5), 1998, pp. 795-804

Abstract

We tested for environmental factors that may lead to balancing selection and to the maintenance of a genetic polymorphism at the enzyme locus lactate dehydrogenase B (LDH-B) in the pool frog, Rana lessonae. Weraised tadpoles individually in a factorial experiment in which we manipulated temperature, food level, and food quality. The only statistically significant difference among LDH-B genotypes was in growth rate,with the heterozygote performing best. Although the difference was not significant, heterozygotes also tended to perform best for size at metamorphosis. However, heterozygotes did not perform best in terms of other traits (age at metamorphosis and rates of survival and metamorphosis), where differences among LDH-B genotypes were also not significant. The size of the effect of LDH-B genotype depended on the environment, which suggests that the locus may be selectively neutral in some environments. There were no genotype-environment interactions in the sense that reaction norms along environmental gradients did not cross. When we raised tadpoles in groups, e/e homozygotes had a significantly higher body mass and developed at the significantly highest rate. In addition, there may be a trade-off between larval and adult performance: adult frogs show a different ranking in performance of LDH-B genotypes than tadpoles do. These results suggest that this genetic polymorphism is maintained through heterozygote advantage, possibly in conjunction with antagonistic pleiotropy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 19:24:09