Abstract
Assessing invasion risk of Didemnum vexillum to Atlantic Canada
Highlights
Dispersal of species into new areas is an ongoing natural process, concurrent deliberate or unintentional anthropogenic introduction of species beyond their ranges is generally considered an unwanted phenomenon
P. magnifica is considered a native species in North America, where it was first found near Philadelphia by Leidy (1851)
Information about shipping fairways in the Vuoksi watercourse was obtained from the open database of the Finnish Transport Agency
Summary
Dispersal of species into new areas is an ongoing natural process, concurrent deliberate or unintentional anthropogenic introduction of species beyond their ranges is generally considered an unwanted phenomenon. Species introductions may have irreversible and uncontrollable adverse impacts on biodiversity and ecosystem functions Can they displace native species by predation or competition, but they can transmit (parasitic) diseases harmful to native species and cause environmental or health-related impacts and economic costs, for example by biofouling Costs from all biofouling animals are estimated to be more than 250 million € per year worldwide (Nakano and Strayer 2014) One such biofouling, invasive species is the bryozoan moss animal Pectinatella magnifica Leidy, 1851 (Figure 1). P. magnifica is considered a native species in North America, where it was first found near Philadelphia by Leidy (1851). Since it has been recorded mostly in the North-Eastern part of the United States The species spread seems to have accelerated during recent decades (e.g. Devin et al 2005, Notteghem 2009) and it is reported from Asia, including Japan (Mawatari 1973), South Korea (Jo et al 2014; Jeong et al 2015) and China (Wang et al 2017)
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