Plate B9.1a (a) The frequency of commercial shipping traffi c along shipping routes around the world, ranging from low
(blue) to high (red). From Halpern et al. (2008). (b) Global hotspots for biological invasion from ballast water, ranging from
low (blue) to high (red). From Drake and Lodge (2004).
(blue) to high (red). From Halpern et al. (2008). (b) Global hotspots for biological invasion from ballast water, ranging from
low (blue) to high (red). From Drake and Lodge (2004).
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