. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 514 CALIFORNIA FISH AND GAME NESTLINGS LEAVE NEST EGGS HATCHED EGGS LAID NEST BUILDING OR NEST REPAIR NO ACTIVITY DATES MONTH. o-^ 10 20 March 10 20 April 10 20 May 10 20 June 10 20 July 10 20 Aug. 10 20 Sept. FIGURE 5. Productivity of one pair of doves (Nest No. 20, 1949) in which six broods and 12 fledglings were raised successfully for six broo'ds per nesting season. One pair, in Xest 20 (Figure 5) ful- filled this potential during
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 514 CALIFORNIA FISH AND GAME NESTLINGS LEAVE NEST EGGS HATCHED EGGS LAID NEST BUILDING OR NEST REPAIR NO ACTIVITY DATES MONTH. o-^ 10 20 March 10 20 April 10 20 May 10 20 June 10 20 July 10 20 Aug. 10 20 Sept. FIGURE 5. Productivity of one pair of doves (Nest No. 20, 1949) in which six broods and 12 fledglings were raised successfully for six broo'ds per nesting season. One pair, in Xest 20 (Figure 5) ful- filled this potential during 1949 by producing six broods, with clutches of two eggs each, and 12 young were fledged successfully. Although the parents were not marked, the succeeding nestings were so regular in sequence and so uniform in timing that I felt entirely certain that only the one pair used the nest. The periods between fleclging of one brood and appearance of new eggs were 3, 1, 2, 1 and 5 days, respectively, as shown in Figure 5. In many other nests the interval from fledgings to eggs likewise was found to average 2 to 3 days. On one occasion, an ego^ was laid in a nest with fledglings a day before they departed. In 10 other nests in which clutches or young were destroyed, the average period elapsing before appearance of new eggs was 18 days and then apparently Ijy another pair. A recent report by Austin (1951) shows tliat ''site tenacity" to the breeding territory a])pears to be a fixed behavior trait of the mourning dove. This behavior is the tendency of individual birds to return to the same territorv vear after vear. Further analvsis of observations here leads me to think tliat individual pairs commonly confine their nesting activities to very local areas. As an example, on the headquarters area each year daily activities of two pairs were observed closely. When either of these two pairs left an old nest to build a new one, it was always constructed again within the headquarters are
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