Duck populations and forage crops at the Ribstone irrigation system in east-central Alberta / Jeffery W. Nelson and Robert T. Clay.
Material type:
TextSeries: . No. 18 B.S.G. Technical Report.Publication details: 1984. Ducks Unlimited Canada,Description: xi, 91 p. : ill. , map ; 28 cmOnline resources: Abstract: The effects of water regime on duck populations and vegetation in backfloods of the Ribstone Irrigation System were studied in 1983.Except for dry controls, flooding began in most backfloods in April or May and reached maximum depths of 1 m by the end of May. Density of duck pairs was similar in wet and dry backfloods, and ranged from 2.8/ha in flooded backfloods to 3.3/ha in dry controls. Brood numbers also did not appear to be affected by water regime although brood density did increase through the summer as backflood size declined. Brood density ranged from 0.4 to 3.7 broods/ha. The species composition of pairs and broods was affected by flood regime, with divers being almost absent in dry areas. Duck nest density was also unaffected by flood regime,however nest success around reservoirs was extremely low. Nesting chronology was affected by water regime: early breeders began nesting later than they did in central Alberta projects, and mid-season breeders began nesting earlier tha
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Includes bibliographical references (p. 44-45).
The effects of water regime on duck populations and vegetation in backfloods of the Ribstone Irrigation System were studied in 1983.Except for dry controls, flooding began in most backfloods in April or May and reached maximum depths of 1 m by the end of May. Density of duck pairs was similar in wet and dry backfloods, and ranged from 2.8/ha in flooded backfloods to 3.3/ha in dry controls. Brood numbers also did not appear to be affected by water regime although brood density did increase through the summer as backflood size declined. Brood density ranged from 0.4 to 3.7 broods/ha. The species composition of pairs and broods was affected by flood regime, with divers being almost absent in dry areas. Duck nest density was also unaffected by flood regime,however nest success around reservoirs was extremely low. Nesting chronology was affected by water regime: early breeders began nesting later than they did in central Alberta projects, and mid-season breeders began nesting earlier tha