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.. f F. • • • United States Department of the Interior FISH AND K7LDLIFE SERVICE DENVER WILDLIFE RESEARCH CENTER 1300 Blue Spruce Drive Fort Collins, CO 80524 Mr. Dale Thompson Col o-llyo f4i ne 5731 State Highway 13 Meeker, CO 81641 Dear Mr. Thompson: ~~~ ~`.`•rL~ ~'l~'~11 cember 19, 1980 ~^ ' D E C '', :: 1920 ; JI J I l CULUWYU CVAL CU7vlr^nN'f. L/~ND I RLC Ll~tLr~T~OfJ DEPT. Reference is made to your call to Dr. Streeter, 41ELUT, and our subsequent telephone conversation on December 12, 1980 about premining information on bird and mammal numbers in the Streeter Canyon area. Enclosed please find a map showing location of four areas in northwestern Colorado, including Streeter Canyon, that were sampled for numbers of breed- ing birds and numbers of small mammals in 1975. The enclosed aerial photo shows the approximate boundaries of the 40-acre plot in Streeter Canyon that was sampled for numbers of breeding birds. The pencilled line on the photo shows the approximate location of the transect line used in sampling for numbers of small mammals. Corners of the 40-acre plot and ends of the small mammal transect line, and associated 5-acre grid, were marked with steel fence posts. Perhaps the post may still be in place. _ Table 1 shows the number of birds, by species, that were spot mapped in the various sampling periods. Table 2 shows the best approximation of number of breeding birds for the areas sampled, including Streeter Canyon, resulting from the spot mapping records for the seven sampling periods. The arrangement used to sample numbers of small mammals is shown on the enclosed form. Live traps were used on the 5-acre grid in a mark-recapture effort for 6 days. After the 6th day, the live traps were removed and a transect line of snap traps (20 stations, three traps per station, operated for three days and nights) was used to sample the area. Stations were 50 feet apart and one rat trap and two museum special snap traps were used at each station. Results of the small mammal sampling are shown in Tables 3 and 4. Table 3 shows the numbers of marked animals assumedly alive at termination of the 6-day live trapping period. r~+l ~EROV Save Energy and You Serve America! w ~=. ;_~.:: ~,;,~;. .~._ tiC:•~~ ;.. .~_ ~: - . -°;'._ _._ . ~.w t t~ ~T ~.: . p' .. ~~ ~F .,y4+" L~^•.f ~" ,.... . ,-.... .