Abstract. Of the 56 species of aquatic Hemiptera in the prairie provinces, 51 occur in the grassland and parkland areas. The majority are represented by lentic species that are ecological generalists, able to adapt to the loss of wetland habitats by utilizing man-made dugouts. Most lentic species are not confined to the Prairies Ecozone, but occur also in forested regions to the north. A few species of aquatic Hemiptera are restricted to lotic or saline habitats. These species seem to have narrower ecological niches and could be affected by loss of these habitat types in the prairies.Résumé. Cinquante et une des 56 espèces d'hémiptères aquatiques des provinces des Prairies se trouvent dans la prairie et dans la forêts-parc. Il s'agit en majorité d'espèces lentiques, généralistes au plan écologique, et capables de s'adapter à la disparition des habitats humides en utilisant des mares artificielles. La plupart des espèces lentiques ne se limitent pas à l'écozone des prairies, mais se trouvent également dans les régions boisées du nord. Quelques espèces d'hémiptères aquatiques sont limitées aux habitats lotiques ou salés. Ces espèces semblent dépendre de niches écologiques plus restreintes et pourraient souffrir de la disparition de ces types d'habitats dans les prairies.
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