Layer: Coastal invasive species (ID: 31)

Name: Coastal invasive species

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Description: The incidence of invasive species was modeled as a function of the amount of cargo traffic at a port, on the basis of results from other studies showing a relationship between these two variables and in the absence of actual data for the global distribution of invasive. Port volume values were input into a model of spread that was used to calculate a relative measure of risk of invasive species. To model the spatial impact of invasive species, a diffusive plume model was used to mimic invasion fronts and spread the value for each port at 1 km2 resolution into adjacent waters, with a minimum threshold value of 5 mt set as a limit to the spread of the plume (i.e., once the value in a cell fell below 5 mt, the plume was assumed to be at its furthest extent). This set a maximum distance from the largest port of 1000 km, an arbitrary but reasonable maximum distance. These areas were then clipped to the shallow habitats (<60 m depth), since most known invasive species transported by ballast water are intertidal or shallow subtidal. This approach to modeling invasive species does not account for species that arrive through other transport mechanisms (such as aquaculture), and it assumes a linear relationship between invasive species occurrence and port volume, and between spatial extent of the invasion and port volume.

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Copyright Text: National Center for Ecological Analysis and Synthesis, 735 State Street - Santa Barbara, California, USA. http://www.nceas.ucsb.edu/GlobalMarine

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