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The critically endangered Saimaa ringed seal, which inhabits Lake Saimaa in Finland, has extremely low genetic diversity and this development seems to continue, according to a recent study. Researchers analyzed the temporal and regional variation in the genetic diversity of the endangered Saimaa ringed seal. The population is only around 300 individuals divided into smaller sub-populations and with very little migration among between them.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/wyP3yODPgbY/141024101252.htm