1. Along the coast of Vancouver Island in British Columbia, Canada consists of intertidal zones containing three different species of mussels. Mussel one is tan with a spiral shaped shell and mussel two is grey with a smooth shell. Both of these mussels have inhabited the intertidal zone for hundreds of years. Between 1990 and 1995 a third mussel was introduced due to ship activity along the coast of the island. To be understand the mussel population scientists collected population data from 1985 to 2005. Year Population Size Mussel 1 Mussel 2 Mussel 3 1985 4800 3925 1990 5850 4050 1995 5500 4200 150 2000 1600 4050 2100 2005 1400 4225 5280

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