A study of waterfowl ecology at ponds blasted in Manitoba's Delta Marsh / Ronald H Hoffman
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TextPublication details: East Lansing, MI : Michigan State University, 1967.Description: viii, 109 leaves : 29 cm. illOnline resources: Abstract: Forty-one ponds were blasted with ammonium nitrate in a prairie marsh.During 33 weeks of field work (fall of 1964 through 1966) quantitative measurements were made of pond morphometry, soils, waters, macrophytes,invertebrates, and waterfowl use. Changes in morphometry indicated a minimum life of 30 years for the 5 x 26 x 52-foot ponds. High water loss contributed to increased salinization of pond soils and waters. A few large storms added more water to the ponds than the same amount falling in many small showers. Ponds within 300 feet of the bays received seepage water. The macrophyte, Potomogeton pectinatus, and the invertebrates, Daphnia and tendipedidae, dominated the aquatic community. Plants common to the surrounding meadow invaded the pond shoulders. During the first two years, the quality and quantity of macrophytes and invertebrates increased in the ponds.
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Thesis(M.S.)--Michigan State University, 1967.
Includes bibliographical references (leaves 100-107).
Forty-one ponds were blasted with ammonium nitrate in a prairie marsh.During 33 weeks of field work (fall of 1964 through 1966) quantitative measurements were made of pond morphometry, soils, waters, macrophytes,invertebrates, and waterfowl use. Changes in morphometry indicated a minimum life of 30 years for the 5 x 26 x 52-foot ponds. High water loss contributed to increased salinization of pond soils and waters. A few large storms added more water to the ponds than the same amount falling in many small showers. Ponds within 300 feet of the bays received seepage water. The macrophyte, Potomogeton pectinatus, and the invertebrates, Daphnia and tendipedidae, dominated the aquatic community. Plants common to the surrounding meadow invaded the pond shoulders. During the first two years, the quality and quantity of macrophytes and invertebrates increased in the ponds.