Till startsida
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Idotea balthica

Species biology: The isopod Idotea baltica is an ecosystem engineer which increases productivity of seagrass beds (Zostera) by reducing epiphytes, and a documented controlling influence on the macroalgae Fucus vesiculosus. As a food source in itself I. baltica is a major part of the diet of many fish species, including the commercially important Cod (Gadus morhua), Perch (Perca fluviatilis) As such I.baltica is a key species to fish stocks, fish biodiversity and maintaining the sublittoral zone in its current form. It is found throughout the Baltic Sea in association with Zostera and Fucus, down to salinities as low as 4 psu. I. balthica has dimorphic sexes and the brooded offspring have direct development with no planktonic stages.

Rationale for developing this model: Idotea balthica has a short generation times (ca 6 months) and is very easy to culture. The natural environment is easily reproduced in laboratory experiments and even field manipulations are possible. It is characterised by its high tolerance of low salinity, and as a brooding species I. balthica is an ideal marine model organism for evolutionary studies where phenotypic plasticity and response to selection can be estimated using common-garden and breeding experiments

Key references: Jormalainen & Tuomi 1989; Orav-Kotta & Kotta 2004; Vesakoski et al. 2008; Leidenberger et al. 2012; Wood et al. 2014; Panova et al. 2016

Estimated Genome size: 1 Gbp

Available sequence information: mitochondrial COI and 28S rDNA sequences form phylogenetic study in Panova et al. 2016, Zoologica Scripta

Genome sequencing progress: (last updated 2018-01-01)
Illumina libraries, bp – 2*300bp (125 & 150 bp reads, paired-end), 2*550bp (300bp reads, paried-end)
Total Illumina sequence data, Gbp - 65
Total size Illumina assembly, Gbp - 1.3
Contig N50, bp – 1 765

Hybrid assembly under construction:
PacBio data – 25 Mb, Mean read length 8 kb.
10 x Chromium data – 690 Mreads, read length 150 bp (mean fragment length 10 kb).

Additional species sequencing progress: 
Transcriptome assembly - Sequence length: 78 Mbp, N50: 1132 bp.
RNA-Seq data, gene expression due to dietary change.
Population genomic 2b-RAD data from the Baltic Sea

Additional genetic resources: -

Other resources: -

In culture: No

Contact: Pierre De Wit – pierre.de_wit@marine.gu.se
Bioinformatician: Pierre De Wit - pierre.de_wit@marine.gu.se

IMAGO marine model species

Idotea balthica

Poster presented at
Marine Evolution 2018


Page Manager: Eva Marie Rödström|Last update: 1/18/2018

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