The effect of flooding duration on productivity of beaver ponds in eastern Ontario / Joel W. Ingram
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TextPublication details: Montreal, QC : McGill University, 1997.Description: xv, 106 leaves : ill. ; 29 cmOnline resources: Abstract: This study investigated the relationship between flood duration of beaver ponds in eastern Ontario and their productivity for waterfowl.The primary objective was to assess the effect of removing water from a beaver pond for one year had on the subsequent productivity of the wetland. Productivity was estimated by sampling water chemistry,standing crops of aquatic invertebrates, vertebrates, algae and vegetation composition and distribution in naturally occurring and managed beaver ponds of varying ages during 1994 and 1995. Three ponds in each of the following categories were sampled; managed ponds reflooded in 1993, managed ponds reflooded in 1991, naturally occurring beaver ponds reflooded in 1992-93, and naturally occurring old flood ponds (>5 yeas old). Water and soil nutrient levels did not differ among treatments and no differences in phytoplankton chlorophyll a levels were observed. Epiphytic algae chlorophyll a was higher in the new flood treatments, both managed and natural.
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Thesis(M.Sc.)--McGill University, 1997.
Includes bibliographical references (leaves 47-51).
This study investigated the relationship between flood duration of beaver ponds in eastern Ontario and their productivity for waterfowl.The primary objective was to assess the effect of removing water from a beaver pond for one year had on the subsequent productivity of the wetland. Productivity was estimated by sampling water chemistry,standing crops of aquatic invertebrates, vertebrates, algae and vegetation composition and distribution in naturally occurring and managed beaver ponds of varying ages during 1994 and 1995. Three ponds in each of the following categories were sampled; managed ponds reflooded in 1993, managed ponds reflooded in 1991, naturally occurring beaver ponds reflooded in 1992-93, and naturally occurring old flood ponds (>5 yeas old). Water and soil nutrient levels did not differ among treatments and no differences in phytoplankton chlorophyll a levels were observed. Epiphytic algae chlorophyll a was higher in the new flood treatments, both managed and natural.