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Heterosis for neonatal survival in the guppy

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Neonatal survival rate ranged from 91.8 to 100.0% in 12 populations of the guppy Poecilia reticulata, and was higher in naturalized Japanese stream populations than in domestic strains. Mean heterozygosity at five allozyme and four microsatellite loci varied between 0.112 and 0.430 and was significantly correlated with neonatal survival rate among populations, suggest ing that inbreeding decreases neonatal survival. Diallel and reciprocal crosses among four domestic strains demonstrated heterosis for neonatal survival. These results indicate that neonatal survival is genetically affected by heterosis and its antithesis, inbreeding depression. The relationship between neonatal survival and the mean heterozygosity suggests that overall heterozygosity is important for neonatal survival of the guppy.
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Document Type: Research Article

Affiliations: Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai, Miyagi 981-8555, Japan

Publication date: 2002-03-01

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