Pre- and post- construction : Marilyn R. Rayner. evaluation of the Delta Marsh /
Material type:
TextPublication details: Winnipeg, MB : 1979-81. Ducks Unlimited Canada,Description: 3 v. (various pagings) : ill. , maps ; 28 cmOnline resources: Abstract: The first full season of pre-construction evaluation was completed on the Delta Marsh. Water levels were a foot lower than those of 1979 and the Lake Francis Unit was a foot higher than the rest of the marsh in both years. Waterfowl use of the marsh was not statistically different between 1979 and 1980, but a slight reduction in fall staging was noted.Counts made by habitat indicated that dabbler and diver density is not the same in all habitats. There were fewer broods in 1980 (2.5/km) as compared with 1979 (3.6/km). The greatest number of broods were observed in wide, shallow creeks, channels or arms. Invertebrate abundance and diversity were significantly different between habitat types. Algae grew profusely in the shallow water of School Bay Unit and out-competed the submergent plants, but this did not happen in Sioux Pass Unit where water levels were a foot higher. Emergents in both these units showed a reduction in stem density due to higher water levels in 1979, but the lower
| Item type | Current library | Collection | Call number | Status | Notes | Date due | Barcode |
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Electronic Report
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Electronic Library | Non-fiction | RAY (Browse shelf(Opens below)) | Available | April 1980 Report | 15902 | |
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Electronic Report
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Electronic Library | Non-fiction | RAY (Browse shelf(Opens below)) | Available | March 1981 Report | 15903 | |
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Electronic Report
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Electronic Library | Non-fiction | RAY (Browse shelf(Opens below)) | Available | November 1979 Report | 1285 |
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The first full season of pre-construction evaluation was completed on the Delta Marsh. Water levels were a foot lower than those of 1979 and the Lake Francis Unit was a foot higher than the rest of the marsh in both years. Waterfowl use of the marsh was not statistically different between 1979 and 1980, but a slight reduction in fall staging was noted.Counts made by habitat indicated that dabbler and diver density is not the same in all habitats. There were fewer broods in 1980 (2.5/km) as compared with 1979 (3.6/km). The greatest number of broods were observed in wide, shallow creeks, channels or arms. Invertebrate abundance and diversity were significantly different between habitat types. Algae grew profusely in the shallow water of School Bay Unit and out-competed the submergent plants, but this did not happen in Sioux Pass Unit where water levels were a foot higher. Emergents in both these units showed a reduction in stem density due to higher water levels in 1979, but the lower