Genome size estimates for some oligochaete annelids

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Haploid genome sizes (C-values) were estimated for 12 species of freshwater oligochaetes (families Naididae and Tubificidae) and 15 species of earthworms (families Lumbricidae and Megascolecidae). Aquatic worms ranged in genome size from about 0.8 to 7.6 pg, while earthworms varied from approximately 0.4 to 1.2 pg. Interspecific differences in nuclear DNA content did not appear to be linked to variation in chromosome number, but there was evidence of cryptopolyploidy in the aquatic worms. No correlations were found between genome size and either body size or life-history traits, although there may be an association between higher DNA content and parthenogenetic reproduction in earthworms.

Nous avons estimé la taille du génome haploïde (les valeurs de C) de 12 espèces d'oligochètes d'eau douce (familles Naididae et Tubificidae) et de 15 espèces de vers de terre (familles Lumbricidae et Megascolecidae). Le génome des vers aquatiques varie en taille d'environ 0,8 à 7,6 pg, alors que celui des vers de terre va d'environ 0,4 à 1,2 pg. Les différences interspécifiques de contenu d'ADN nucléaire ne semblent pas reliées à la variation du nombre de chromosomes, mais il y a des indices de l'existence de cryptopolyploïdie chez les vers aquatiques. Il n'y a pas de corrélation entre la taille du génome d'une part, et la taille du corps et les caractéristiques du cycle biologique d'autre part, bien qu'il puisse y avoir une association entre le contenu plus élevé d'ADN et la reproduction parthénogénétique chez les vers de terre.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2002

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