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~I <br />1 <br />1 <br />~' <br />1 <br />I 1 <br />1 <br />1 <br />• <br />• <br />OCCUPANCY AND PRODUCTIVITY OF COLORADO PEREGRINE EYRIES <br />1972-1977 <br />11 of eyries visited 15 23 24 26 27 31 <br />~ of occupied sites 11 12 9 8 8 12 <br />If of adult pairs 8 11 7 6 5 11 <br />11 of lone adults 3 1 2 1 1 1 <br /> 1/ 2/ <br />II of young fledged -- 2 11 S 6 11 <br /> 31 <br />/1 of young/adult pair -- 0.2 1.6 0.8 1.2 1.0 <br /> 4/ <br />X of sites occupied 73X 52X 38% 31% 30% 39% <br /> of sites w/adult pairs 53X 49X 29% 27X 26% 357, <br />1/ One site contained 3 young, but adult female and young could not be found <br />2 to 3 weeks after they should have fledged. Thus, probable fledging success <br />is reduced to S. <br />2/ Captive produced young were placed at two sites to artificially augment <br />production by 4 young. <br />3/ An average of at least 1.4 young fledged per pair is considered necessary <br />to sustain the wild population. <br />4/ Between 10% and 20Y, of the eyrie sites would normally be expected to be <br />unoccupied in any particular year. <br />-44- <br />