Till startsida
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Littorina saxatilis

Species biology: Littorina saxatilis is a dominant grazer on filamentous and microalgae in North Atlantic rocky shores. It commonly reaches densities of several hundred snails per square meter and its removal completely changes the ecosystem of rocky shores. It is an important food source for crabs, and in some areas birds and fishes. A related species (L. littorea) is of some commercial value.

Rationale for developing this model: The species is strongly polymorphic and distinct ecotypes evolve repeatedly in contrasting microhabitats. Notably ecotypes evolve strong reproductive barriers and incipient species, and this species is considered to be one of the rare examples of speciation in the presence of gene flow (sympatric speciation).

Key references: Panova et al. 2006 Molecular Ecology, Quesada et al. 2007 Evolution, Johannesson et al. 2010 Philosophical Transactions of the Royal Society B, Galindo et al. 2010 Journal of Evolutionary Biology.

Estimated Genome size: 1.5 Gbp

Available sequence information: EST database (Canbäck et al. 2011 Molecular Ecology Research)

Genome sequencing progress: (last updated 2016-08-25)
Illumina Libraries, bp - 150, 200, 350, 520, 1300, 2500, 6000
Total size assembly, Gbp – 1,8
Scaffold NG50, kb – 38
Max scaffold size, kb – 640

In addition ≈ 40X PacBio data is currently being added to scaffold the assembly further.

Additional genetic resources: Microsatellites, Nuclear introns

Other resources:
Morphological variation assessed using landmark-based morphometrics (Hollander et al. 2006 Evolution)

Mate-choice and sexual selection assessed using video recordings and computerised motion analysis (e.g. CellTrak for Windows, Motion Analysis Corp. Johannesson et al. 2010 PLoSONE)

In culture: Yes

Contact: Marina Panova – marina.panova@marine.gu.se
Bioinformatician: Tomas Larsson - tomas.larsson@marine.gu.se

IMAGO marine model species
Page Manager: Eva Marie Rödström|Last update: 8/25/2016
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