Proceedings - Teaching and Learning Centre - Simon Fraser ...
Proceedings - Teaching and Learning Centre - Simon Fraser ... Proceedings - Teaching and Learning Centre - Simon Fraser ...
Fraser River Action Plan 3rd Research Workshop Changes in Fish Communities and Water Chemistry after Cessation of Municipal Sewage Discharge near the Iona Island Foreshore, Fraser River Estuary D.J.H. Nishimura, G.E. Piercy, C.D. Levings, K. Yin and E.R. McGreer Department of Fisheries and Oceans Fish abundance, fish diversity and water chemistry were examined seven years after cessation of disposal of sewage effluent into the foreshore area of Sturgeon Bank in the Fraser River estuary. In July and August, 1995, a total of 7,902 fish, comprised of nine species, were captured at six sites along the south side of Iona Jetty. The number of fish observed at the three sites closest to the former outfall was greater than that observed at the three sites furthest from the outfall. A significant difference (ANOVA; p0.05) among sites. A similar study, when sewage effluent was being discharged, was conducted in 1980. Although the number of fish species recorded in 1980 was higher than in 1995, a significant increase (ANOVA; p
Fraser River Action Plan 3rd Research Workshop Shorebird and Invertebrate Interactions M.A. Sewell 1 and R.W. Elner 2 1 CWS/NSERC Research Chair in Wildlife Ecology Simon Fraser University 2 Canadian Wildlife Service Environment Canada Each spring, the extensive intertidal mudflats of the Fraser River estuary are a stopover for millions of migratory shorebirds, especially Western Sandpiper (Calidris mauri), enroute to breeding grounds in the north. Many of these same birds and their young pass through the area again in the fall. Other migratory shorebirds, such as Dunlin (Calidris alpina pacifica) overwinter around the estuary. Infaunal and epifaunal intertidal invertebrates form a prey-base for many shorebirds and, also, fish and crab in the estuary. A series of sediment cores were taken at various sites between Boundary Bay and Westham Island to examine, variously, community composition, relative abundance and spatial and temporal patterns of invertebrates. The macrofaunal (>500 micron) component was numerically dominated by a few species: amphipods (Corophium spp.), podocopid ostracods, polychaetes and the gastropod Batillaria zonalis. However, the highly patchy spatial distribution of these invertebrates was a major barrier to establishing monitoring protocols and deriving relative abundance estimates. Exclosure and random sampling experiments were performed to assess expected depressions in macrofaunal invertebrate densities during the spring migration period. However, there was little evidence for any reduction in invertebrate numbers due to shorebird predation. The possible reasons were: 1. the scale of patchiness prevented detection of any depression in prey density; and, 2. shorebirds are focusing on meiofaunal (
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<strong>Fraser</strong> River Action Plan 3rd Research Workshop<br />
Changes in Fish Communities <strong>and</strong> Water Chemistry after Cessation of<br />
Municipal Sewage Discharge near the Iona Isl<strong>and</strong> Foreshore,<br />
<strong>Fraser</strong> River Estuary<br />
D.J.H. Nishimura, G.E. Piercy, C.D. Levings, K. Yin <strong>and</strong> E.R. McGreer<br />
Department of Fisheries <strong>and</strong> Oceans<br />
Fish abundance, fish diversity <strong>and</strong> water chemistry were examined seven years after cessation of disposal of<br />
sewage effluent into the foreshore area of Sturgeon Bank in the <strong>Fraser</strong> River estuary. In July <strong>and</strong> August, 1995,<br />
a total of 7,902 fish, comprised of nine species, were captured at six sites along the south side of Iona Jetty. The<br />
number of fish observed at the three sites closest to the former outfall was greater than that observed at the three<br />
sites furthest from the outfall. A significant difference (ANOVA; p0.05) among sites.<br />
A similar study, when sewage effluent was being discharged, was conducted in 1980. Although the number of<br />
fish species recorded in 1980 was higher than in 1995, a significant increase (ANOVA; p
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