Nearshore Habitat Use by Juvenile Chinook Salmon in Lentic ...

4
3.5
Chinook/100 m
3
2.5
2
1.5
1
0.5
0
Other
sites
Site 3
Other
sites
Site 3a Site 3b
Other
sites
Site 3a Site 3b
2001 2002 2003
FIGURE 18.—Mean abundance (number observed per 100 m of shoreline) of juvenile Chinook salmon at
the restoration site (open bars, site 3) and other sites (shaded bars, sites 1,2,4,5,6 combined) in Seward
Park, south Lake Washington, April–June 2001-2003. Site 3 is located on the northeast side of Seward
Park. Site 3a is the southern section of site 3 that received large gravel and cobble while site 3b is the
northern section that received small gravel.
Seward Park, 2004.–From February to April, no Chinook salmon were observed
at any of the five sites (1,3a, 3b, 5, S-1) surveyed in Seward Park in 2004. In contrast,
large numbers of Chinook salmon were observed at most of these sites in May and June
(Figure 19). More Chinook salmon were observed at site 1 than the other three sites
combined. On both May 11 and June 4, 37 Chinook salmon were observed. Prior to
2004, the highest number of Chinook salmon observed in May or June at site 1 was 9 fish
and at all sites the highest number was 13 fish. At the restoration site (sites 3a and 3b),
no Chinook salmon were observed throughout the study period.
Beer Sheva Park, 2003.–Eight night snorkeling surveys were conducted at Beer
Sheva Park (boat ramp transect only) from February 19 to June 30. Chinook salmon
were observed on each survey date (Figure 20). Similar to 2002, the highest abundance
occurred in May. The mean abundance (March-June) of Chinook salmon was
substantially higher in 2003 (51 fish/100 m) than 2002 (33 fish/100 m) but differences
were not significant (Wilcoxon sign rank test; Z = 1.2; P = 0.25).
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