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. 2009 May 4;106(20):8239–8244. doi: 10.1073/pnas.0812300106

Fig. 1.

Fig. 1.

Distribution of the European seaweed Fucus serratus in 1903 (19; blue and green border) and today (Inset, gray border) in the Canadian Maritimes. In 1903, F. serratus occurred from Pugwash to Mulgrave (M) on the Strait of Canso (arrow) between Cape Breton Island (CBI) and mainland Nova Scotia (NS), the tip of Prince Edward Island (PEI), and southward from Cheticamp to an area near Port Hawkesbury (PH). Our molecular results indicate that this distribution represents a convergence at the Strait of Canso of 2 different introductions. The shore near the French Fortress (1713–1758) of Louisbourg (L) remains uncolonized. Secondary (20th Century) colonization sites in mainland NS are shown in Inset.