. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. WATERFOWL PRODUCTION ON ARTIFICIAL ISLANDS 135 TABLE 1. Summary of Waterfowl Nesting Success During the 1986 Nesting Season at Mountain Meadows Reservoir. Total Nests Predation Other Species nests hatched Canid Bird Unknown Total Abandoned losses Canada goose 38 2 19 2 10 31 3 2* Mallard 36 14 8 8 1 17 2 3 + Cinnamon teal 6220 02 2 0 Redhead 110 0 0 0 0 0 Total ducks 43 17 10 8 1 19 4 3 * One nest lost to human disturbance, fate of on
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. WATERFOWL PRODUCTION ON ARTIFICIAL ISLANDS 135 TABLE 1. Summary of Waterfowl Nesting Success During the 1986 Nesting Season at Mountain Meadows Reservoir. Total Nests Predation Other Species nests hatched Canid Bird Unknown Total Abandoned losses Canada goose 38 2 19 2 10 31 3 2* Mallard 36 14 8 8 1 17 2 3 + Cinnamon teal 6220 02 2 0 Redhead 110 0 0 0 0 0 Total ducks 43 17 10 8 1 19 4 3 * One nest lost to human disturbance, fate of one nest undetermined. + Two nests lost to cattle trampling, fate of one nest undetermined. Dow (1943), Miller and Collins (1953), Naylor (1953), and Naylor and Hunt (1954) reported predation losses on island, wetland, and upland habitat in northeastern California of to Giroux (1981) found 17% of Canada goose nests on islands in southeastern Alberta, Canada were subject to predation. Of the 31 nests lost to predation at Mountain Meadows Reservoir, 61% were destroyed by canids (coyote, Cam's latrans, and domestic dog), 6% by birds (probably common raven, Corvus corax, black-billed magpie, Pica pica, and gulls, Larus spp.), and 32% by unidentified predators. Goose nesting begins prior to spring runoff when water levels are low, allowing canid predators access to the nesting islands (Figure 1). DUCK NESTING GOOSE NESTING 1511 2 "3? 15110 z 9 1 LU 15100. 3/20 3/31 4/10 4/23 5/2 5/12 5/22 5/29 DATE (1986) 6/10 6/20 6/27 7/2 7/117/16 7/25 Geese Ducks Water Surface Elevation < Q LU rr a. i- w LU z FIGURE 1. Water surface elevation and waterfowl nest predation by canids at Mountain Meadows Reservoir (1986). The percentage of nests that hatched successfully (5%) was substantially lower than the to reported by Dow (1943), Naylor (1953), and Naylor and Hunt (1954) in the Honey Lake Valley, and Miller and Collins (1953) at Tule Lake and L
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