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Amphipod genome sizes: first estimates for Arctic species reveal genomic giants

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The genome sizes of 8 species of amphipods collected from the Canadian Arctic were estimated by flow cytometry. Haploid genome sizes ranged from 2.94± 0.04 pg DNA in Acanthostepheia malmgreni (Oedicerotidae) to 64.62± 2.85 pg in Ampelisca macrocephala (Ampeliscidae). The value for Ampelisca macrocephala represents the largest crustacean genome size recorded to date (and also the largest within the Arthropoda) and indicates a 400-fold variation in genome size among crustaceans. The presence of such large genomes within a relatively small sample of Arctic amphipods is striking and highlights the need to further explore the relationships between genome size, development rates, and body size in both Arctic and temperate amphipods.

La taille du génome a été estimée par cytométrie en flux chez huit espèces d’amphipodes provenant de l’arctique canadien. La taille des génomes haploïdes variait entre 2,94± 0,04pg d’ADN chez l’Acanthostepheia malmgreni (Oedicerotidae) et 64,62± 2,85pg chez l’Ampelisca macrocephala (Ampeliscidae). Le génome de l’Ampelisca macrocephala est le génome crustacé le plus grand rapporté à ce jour (et le plus grand parmi les arthropodes) et indique une variation de 400 fois pour la taille du génome chez les crustacés. La présence de génomes si grands au sein d’un échantillon relativement petit des amphipodes arctiques est frappante et souligne la nécessité d’explorer davantage les relations entre la taille du génome, le taux de développement et la taille corporelle chez les amphipodes tant arctiques que tempérés.

Document Type: Research Article

Publication date: February 1, 2007

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  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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