Laserfiche WebLink
I <br /> <br />• • <br />Occupied Range: As mentioned previously, the majority of those <br />' sites which are occupied are situated in mountainous localities. <br />It has been estimated that approximately 25% (or '7) of the 27 <br />historic sites may no longer be suitable due to habitat change <br />' or human encroachment. The decline in suitability of historic <br />sites may be countered by creation of potential areas by certain <br />development projects such as water impoundments which increase <br />prey diversity or availability. The merit of such projects will <br />' have to be determined when efforts are undertaken to reestablish <br />peregrines. <br /> Essential Habitat Description: The attached map gives general locations <br />' of those areas throughout Colorado which are considered essential <br /> habitat for peregrine falcons. The sites represent a coalition <br /> of active, inactive and potential sites which must be maintained <br /> to assure sufficient regions are available for reoccupancy when <br /> recovery efforts are successful. When the population expands, <br /> the last occupied sites with the greatest history of use are <br /> usually the first to be reoccupied; thus all historic sites <br />' which are still suitable for occupancy must receive the same <br /> protection as those which are presently occupied. <br />' Rather than attempt to give legal description of essential <br /> habitats for each site, boundaries are drawn on the more detailed <br /> regional maps. Should it appear that a proposed project will <br />' impact within any of the boundaries, the Division of Wildlife <br /> should be contacted for futher details. <br />' Major References: <br />Bond, R. M. 1946. The peregrine populations of western North <br /> America. Condor 48 (3): 101-116. <br /> Cade, T. J. 1960. The ecology of the peregrine in gyrfalcon <br />' populations in Alaska. Univ. Cal. Publ. Zool., 63: 151-290. <br /> Cade, T. J. 1975. Current status of the peregrine in North <br /> America. In Murphy, J. R., C. M. White and B. E. Harrell <br /> (eds.) Population status of raptors. Raptor Research <br />' Report, No. 3: 3-12. <br /> Clement, R. C. 1974. Proceedings of a conference on peregrine <br /> falcon recovery. Greenwich, Conn., Feb. 13-15. <br />' Enderson, J. H. 1965. A breeding and migration survey of the <br /> peregrine falcon. Wilson Bull., 77: 327-339. <br /> Enderson, J. H. and G. R. Craig. 1974. Status of the peregrine <br /> falcon in the Rocky Mountains in 1973. Auk, 91: 727-736. <br />' Enderson, J. H. and G. R. Craig. 1976. Rocky Mountain Region <br /> of the United States, pp 266-267. In "the 1975 North <br /> <br />' American peregrine falcon survey", Fyfe et al. The Canada <br />field-Nat. 90 (3): 228-273. <br /> Herbert, R. A. and K. C. Herbert. 1969. The extirpation of <br /> the Hudson River peregrine falcon populations in Hickey, <br /> J. J. '(ed.) Peregrine Falcon Populations. Univ. of Wisc. <br /> Press, Madison. <br /> Hickey, J. J. 1942. Eastern populations of the duck hawk, <br /> Auk. 59: 176-204. <br /> -42- <br /> <br />