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

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TABLE 6.—Diet composition of juvenile Chinook salmon along the shoreline of Lake Washington and at three tributary mouths of Lake Washington, April 2003. n = number of stomach samples analyzed; the range of Chinook salmon lengths is also given; %N = percent number; %O = percent occurrence; %W = percent weight; %IRI = percent index of relative importance. 47 Lake shoreline Kennydale Beach trib. May Cr. Taylor Cr. n = 20, range = 45-84 mm FL n = 6, range = 59-73 mm FL n = 11, range = 56-74 mm FL n = 10, range = 44-62 mm FL Prey group %N %O %W %IRI %N %O %W %IRI %N %O %W %IRI %N %O %W %IRI Insecta Diptera Chironomid pupae and adults 93.4 95 92.9 97.3 92.7 100 74.7 92.2 73.3 90.9 65.1 75.8 76.8 80 82.0 88.8 Chironomid larvae 2.7 55 0.7 1.0 5.7 50.0 14.7 5.6 8.5 90.9 17.1 14.0 10.5 60 2.6 5.5 Other aquatic diptera 0.1 5 0.05 0.01 0 0 0 0 0.8 27.3 1.4 0.4 0 0 0 0 Ephemeroptera 0 0 0 0 0 0 0 0 3.7 54.5 4.0 2.5 1.1 10 1.1 0.1 Collembola 0.4 15 0.1 0.0 0.5 33.3 0.3 0.1 2.7 36.4 1.3 0.9 2.1 10 0.2 0.2 Other aquatic insects 0.1 5 0.02 0.01 0 0 0 0 2.4 36.4 1.6 0.9 0 0 0 0 Homoptera (Aphididae) 0 0 0 0 0.5 33.3 1.0 0.3 0 0 0 0 0 0 0 0 Other terrestrial insects 1.1 15 0.6 0.1 0.3 33.3 8.9 1.7 2.1 36.4 2.0 0.9 4.2 30 6.5 2.2 Crustacea Cladocera - Daphnia 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Other crustaceans 0.2 10 0.7 0.05 0.2 16.7 0.4 0.05 0.3 9.1 0.5 0.04 0 0 0 0 Hydrachnida 1.0 25 0.3 0.2 0 0 0 0 0.8 18.2 0.01 0.1 1.1 10 1.4 0.2 Oligochaeta 0 0 0 0 0 0 0 0 0.3 9.1 0.2 0.02 0 0 0 0 Other 1.0 40 4.6 1.2 0 0 0 0 5.1 63.6 6.6 4.5 4.2 40 6.3 2.9
TABLE 7.—Diet overlap indices (C) of tributary mouths in Lake Washington and Lake Sammamish. Comparisons were made between two different streamflow conditions and between a lakeshore reference site and the two flow conditions. Samples were collected in either March or April in 2003 and 2004. Diet overlap index numbers in bold indicate a significant difference in diet (C < 0.6). ND = no data. Diet overlap index (C ) Lake Base flow High flow Base flow Tributary Year and lake shore and lake shore and high flow Lake Washington Kennydale Cr. 2003 0.80 0.74 0.71 2004 0.70 ND ND Kennydale Beach trib. 2003 0.76 ND ND May Cr. 2003 0.66 ND ND 2004 0.82 0.69 0.67 Taylor Cr. 2003 0.90 ND ND 2004 0.74 0.34 0.45 Lake Sammamish Laughing Jacobs Cr. 2003 0.87 ND ND Tibbetts Cr. 2003 0.68 ND ND TABLE 8.—Diet breadth indices (B) of tributary mouths and lakeshore reference site in Lake Washington and Lake Sammamish. Samples were collected in either March or April. ND = no data. Diet breadth index values can range from 1 (no diet breadth) to infinity. Values less than 2 indicate little diet breadth. Diet breadth index (B ) Lake Base flow High flow Tributary Year tributary mouth lake shore tributary mouth lake shore Lake Washington Kennydale Cr. 2003 1.05 1.14 1.97 1.50 2004 2.49 1.42 ND ND Kennydale Beach trib. 2003 1.70 1.12 ND ND May Cr. 2003 2.17 1.12 ND ND 2004 1.55 1.35 2.45 1.47 Taylor Cr. 2003 1.47 1.26 ND ND 2004 1.74 1.35 4.09 1.47 Lake Sammamish Laughing Jacobs Cr. 2003 1.65 2.01 ND ND Tibbetts Cr. 2003 2.88 2.01 ND ND 48
Page 1 and 2:
U.S. Fish and IU.S. Wildlife FishSe
Page 3 and 4:
SUMMARY In 2003 and 2004, we contin
Page 5 and 6:
An overhanging vegetation/small woo
Page 7 and 8: Table of Contents Page SUMMARY ....
Page 9 and 10: List of Figures Figure Page FIGURE
Page 11 and 12: FIGURE 37.—Water column depth (m)
Page 13 and 14: The major tributary to Lake Washing
Page 15 and 16: Fry emerge from their redds from Ja
Page 17 and 18: FIGURE 2.—Location of index sites
Page 19 and 20: most dates (Figure 4). Unlike 2002,
Page 21 and 22: Chinook/m 2 1 0.8 0.6 0.4 0.2 0 Wes
Page 23 and 24: 0.3 Mercer Island Chinook/m 2 0.2 0
Page 25 and 26: particularly valuable. Shoreline im
Page 27 and 28: FIGURE 8.—Map of south Lake Washi
Page 29 and 30: FIGURE 10—Map of south Lake Washi
Page 31 and 32: # of marked Chinook 40 30 20 10 0 A
Page 33 and 34: CHAPTER 3. RESTORATION SITES Introd
Page 35 and 36: Beer Sheva Park.—At Beer Sheva Pa
Page 37 and 38: Results Seward Park, 2003.—In 200
Page 39 and 40: 4 3.5 Chinook/100 m 3 2.5 2 1.5 1 0
Page 41 and 42: Martha Washington Park, 2003.—In
Page 43 and 44: 120 Chinook/100 m 100 80 60 40 20 s
Page 45 and 46: snorkeling and scuba diving were co
Page 47 and 48: Water column depth (m) . 0.80 0.60
Page 49 and 50: CHAPTER 5. FEEDING AT TRIBUTARY MOU
Page 51 and 52: FIGURE 28.—Location of four south
Page 53 and 54: FIGURE 29.—Photos of sites used t
Page 55 and 56: sampling. At night, Chinook salmon
Page 57: TABLE 5.—Diet overlap indices (C)
Page 61 and 62: TABLE 10.—Diet composition of juv
Page 63 and 64: The lack of a large difference betw
Page 65 and 66: CHAPTER 6. USE OF NONNATAL TRIBUTAR
Page 67 and 68: shallow to snorkel were surveyed th
Page 69 and 70: Number of Chinook ff 700 600 500 40
Page 71 and 72: column depth used by Chinook salmon
Page 73 and 74: Chinook / m . 5 4 3 2 1 2003 - upst
Page 75 and 76: TABLE 13.—Diet overlap index (C)
Page 77 and 78: (P. Castle, WDFW, unpublished data)
Page 79 and 80: FIGURE 41.—Placement of Scotch br
Page 81 and 82: FIGURE 43.—Photo of a group of ju
Page 83 and 84: CHAPTER 8. LAKE QUINAULT SURVEYS In
Page 85 and 86: FIGURE 45.—Photos of large woody
Page 87 and 88: Similar to April surveys, the nears
Page 89 and 90: Chinook / 100m . 500 400 300 200 10
Page 91 and 92: Tabor and Wurtsbaugh (1991) conclud
Page 93 and 94: FIGURE 48.—Location of south Lake
Page 95 and 96: FIGURE 49.—Conducting visual obse
Page 97 and 98: FIGURE 52.—Photo of a group of ju
Page 99 and 100: ACKNOWLEDGMENTS We wish to thank He
Page 101 and 102: workshop, Shoreline, Washington, No
Page 103 and 104: Paron, D.G., and E. Nelson. 2001. S
Page 105 and 106: Werner, E.E., and D.J. Hall. 1988.
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