. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. COOPER'S HAWK NESTING 83 Water Nests were located as much as km, from the nearest water. These large distances occurred late in the nesting cycle, when many of the small streams were dry. Two consecutive years of drastically reduced rainfall preceded the nesting attempts of 1977 (Figure 1). Rainfall nearly quadrupled in the winter preceding the 1978 nesting season, and remained high for the following two years. 70 r c c < 60 ^
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. COOPER'S HAWK NESTING 83 Water Nests were located as much as km, from the nearest water. These large distances occurred late in the nesting cycle, when many of the small streams were dry. Two consecutive years of drastically reduced rainfall preceded the nesting attempts of 1977 (Figure 1). Rainfall nearly quadrupled in the winter preceding the 1978 nesting season, and remained high for the following two years. 70 r c c < 60 ^ 50 ? u = 40 I 30 20 10. 38 year mean _L J_ J_ 69 70 71 72 75 76 77 78 79 80 73 74 YEAR (Ending Year of 12-Month Period: July-June) FIGURE 1. Twelve years of annual rainfall recorded for Sacramento, California. Source: Weather Bureau. Spacing of Territories Densities of nesting Cooper's Hawks were not calculated. When adjacent nesting areas were discovered, the distances between active nests were meas- ured. Distances between active nests of adjacent nesting areas in the Sacra- mento Study Area averaged km (SD=, range: km, n = 13). In the Southern California Study Area distances averaged km (SD = , range: km, n=8). Nesting Biology Unless specifically noted, the data presented in this section were collected in the Sacramento Study Area. Nesting Area Reoccupancy The rate of nesting area reoccupancy was 80% (33 nesting areas reoccupied of 41 rechecked). Seven nesting areas were active in every year of this four-year study. (One of three nesting areas checked for seven consecutive years was active in all seven years.) The previous year's nest was reused in 32% of the nesting areas occupied in consecutive years. This occurred in 11 of 34 reoccupa- tions. Half of all nesting attempts were in rebuilt Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
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