Changes in Waterfowl Habitat with Flooding on the Ottawa River

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Abstract
Changes in riparian vegetation and in waterfowl numbers were studied after a permanent 6-ft rise in the water level of the Ottawa River, Quebec. The pioneering aquatic plants were river bulrush (Scirpus fluviatilis), floating and large-leaved pondweeds (Potamogeton natans, P. amplifolius), marsh cinquefoil (Potentilla palustris), and scarlet knot-weed (Polygpnum coccineum). After flooding, vegetation was less abundant in water less than 36 inches deep and more abundant in water 37-60 inches deep. Only in flooded hardwood forest was the development of vegetation after flooding influenced more by the previous vegetation type than by the depth of water. The number of breeding waterfowl increased from 1.4 to 6.5 pairs per mile.

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