Abstract
Four specimens of the invasive red alga Heterosiphonia japonica were collected from Mahone Bay, Nova Scotia, Canada, in August 2012. The identity of these specimens was confirmed using molecular and anatomical evidence. To the best of our knowledge, this is the first report of H. japonica in Canada – an invasive red alga that has been advancing along the northeastern coast of North America since its recent
Highlights
Heterosiphonia japonica Yendo (1920), an alga native to the Asian Pacific, was introduced to Brittany, France, in 1984 (Sjøtun et al 2008) and spread rapidly along the coast of Europe reaching Norway and Spain by 1996 and the United Kingdom and Mediterranean by 1999
Four specimens of Heterosiphonia japonica were collected on 13 August 2012 during a collecting trip to Nova Scotia as part of an ongoing barcode survey of red algae in Atlantic Canada (Appendix 1 and Table 1)
Mahone Bay, located in Lunenburg County on the south shore of Nova Scotia, is a large bay protected by several islands at its entrance, as well as Aspotogan Peninsula to the east and First Peninsula to the west
Summary
Heterosiphonia japonica Yendo (1920), an alga native to the Asian Pacific, was introduced to Brittany, France, in 1984 (Sjøtun et al 2008) and spread rapidly along the coast of Europe reaching Norway and Spain by 1996 and the United Kingdom and Mediterranean by 1999. The first suggestion that Heterosiphonia japonica had reached North America was from the collection of an unidentified ceramialean alga from Fort Wetherill, Rhode Island, in 2007 It was collected again at the same site in 2009 and by 2010 there were collections from just north of Cape Cod, Massachusetts (Table 1, Figure 1; unpublished data). Based on his collections of 2009, Schneider (2010) determined that this as yet unidentified species was the invasive alga Heterosiphonia japonica. In 2012, colleagues collected this species from Cape Elizabeth in southern Maine (Idlebrook 2012)
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