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Q: Why have many of the natural barriers to the spread of species reduced? Select the TWO best answers.
A: Rapidly increasing world trade. Larger and faster ships completing their voyages in a shorter time.Q: What is the estimated number of species transported by ship ballast?
A: More than 10,000 speciesQ: According to this module, which three things does the Ballast Water Management Convention seek to minimise?
A: The uptake of organisms, the build-up of sediments and the transfer of organisms.Q: According to this module, why does the United States Coastguard require ballast tanks to be cleaned regularly?
A: To remove sedimentQ: How long can some marine species survive in untreated ballast water?
A: Several months or longerQ: Why do sea chest grids and pump filters not prevent the spread of some marine life through ship’s ballasting operations?
A: Because some forms of marine life are very small in the early stages of their development
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