HIGHLIGHTS
SUMMARY
Soon, other crops (e_g, cotton and maize ) were sown for subsistence (Gray and Thompson 1933) and agriculture began to expanded across the nation. The establishment of zebra mussels in the Great Lakes has resulted in the significant decline of Diporeia zooplankton, which are an important component of the diet of a number of fish species, e_g, alewife (Alosa pseudohargengus; also an introduced fish species) and lake whitefish (Coregonus clupeaformis) (McNickle et_al 2006; Pothoven and Madenjian 2008). Nutrient pollution of rivers and lakes is also an issue in Canada, particularly in certain regions, e_g, southwestern . . .
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