List of Figure Captions

Fig. 1 Species ranges of three unionacean bivalves with the boundaries of the study region superimposed and an indication of the apparent post-glacial origins of each (1 Lower Michigan Peninsula route, 2 Fort Wayne Route, 3 Mohawk Route, 4 Champlain Route, and 5 Champlain Sea/St. Lawrence Route - see Mandrak and Crossman 1992).

Fig. 2 Species ranges of an additional four taxa of unionacean bivalves.

Fig. 3 Composite map of biodiversity of the seven species of Unionacea illustrated in Figs 1 and 2.

Fig. 4 Map of the distribution of human population density in the study zone. The darkest areas represent highest human population.

Fig. 5 Map of intensive use of waterways in the Mixedwood Plains Ecozone by humans.

Fig. 6 Chronological map series showing the spread of Dreissena polymorpha , the zebra mussel, in North America from 1988 to 1995.

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