baltic marine mammal population boundaries and phylogeography morten tange olsen helcom seal 8...
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Baltic marine mammalpopulation boundaries and phylogeography
Morten Tange OlsenHELCOM Seal 8Turku, Oct 2014
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Harbour seal management units
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Olsen et al2014Mol Ecol
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Baltic harbour seals mtDNA
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Gråsælen
Grey seal population structure
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Grey seal population structure
• mtDNA– 226 modern + 50 historic samples– 435 bp control region
• Microsatellites– 79 modern samples– 14 loci;
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SCOTLAND WADDEN SEA LÆSØ RØDSAND FALSTERBO CHR.Ø
SCOTLAND WADDEN SEA RØDSAND FALSTERBO CHR.Ø
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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)
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Grey seal finds (15000-3000 BP)
Sommer and Benecke 2003
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Grey seal finds (3000-500 BP)
Sommer and Benecke 2003
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GreyHarbourRingedPorpoise
?
?
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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Olsen et al, unpublished
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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