[1] Univ Ottawa, Dept Biol, Ctr Adv Res Environm Genom, Ottawa, ON K1N 6N5, Canada
[2] Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston, ON K7L 3N6, Canada
[3] Environm Canada, Canadian Wildlife Serv, Iqaluit, NU X0A 0H0, Canada
[4] Univ Toronto, Dept Geol, Toronto, ON M5S 3B1, Canada