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Baltic marine mammalpopulation boundaries and phylogeography
Morten Tange OlsenHELCOM Seal 8Turku, Oct 2014
Harbour seal management units
Olsen et al2014Mol Ecol
Baltic harbour seals mtDNA
Gråsælen
Grey seal population structure
Grey seal population structure
• mtDNA– 226 modern + 50 historic samples– 435 bp control region
• Microsatellites– 79 modern samples– 14 loci;
SCOTLAND WADDEN SEA LÆSØ RØDSAND FALSTERBO CHR.Ø
SCOTLAND WADDEN SEA RØDSAND FALSTERBO CHR.Ø
Grey seal genetic diversity
-0.00499999999999997
3.03576608295941E-17
0.00500000000000003
0.01
0.015
0.02
0.025mtDNA nucleotide diversity
Location
π (9
5% C
I)
Danish historic (54)North Sea modern (71)Baltic modern (142)
Grey seal finds (15000-3000 BP)
Sommer and Benecke 2003
Grey seal finds (3000-500 BP)
Sommer and Benecke 2003
GreyHarbourRingedPorpoise
?
?
Changes in species composition (DK)
Atlantic
Atlantic-S
ubboreal
Subborea
l
Subatl
antic
1500-1888
1889-19270%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
RingedHarpGreyHarbour
Olsen et al, unpublished
Future studies• Combined genetic analysis of harbour, grey
and ringed seal, and porpoise• Population structure and divergence times – Geological events– Climate events– Environmental factors– Historic abundance and distribution
• Existing mtDNA and microsatellite data• Genomic data and ancient DNA