Appendix D
Input Data for Figures 5-6A and 5-6B

“Use-days” is combined number of days that each crane spent on the Platte River in fall and spring of that year, “sightings” are numbers of cranes in fall and spring of that year seen on the Platte River, “population” is the total number of cranes in the Aransas-Wood Buffalo population during that year, “ratio” is the number of cranes divided by the number of birds in population, and “use ratio” is the number of use-days divided by total population in that year. Double counts of crane sightings in Platte River were omitted. Data collected prior to 1975 were not used in these analyses because the data collection effort was extremely variable before 1975. Data for 2003 were not yet complete during committee’s deliberations.

Year

Use-Days

Sightings

Populationa

Ratio

Use Ratio

1950

1

1

31

 

 

1959

2

2

33

 

 

1966

10

2

43

 

 

1974

4

2

49

 

 

1975

36

12

57

 

 

1976

0

0

69

0

0

1977

1

1

71

0.01408

0.01408

1978

0

0

75

0

0

1979

0

0

76

0

0

1980

6

2

78

0.02564

0.07692

1981

0

0

73

0

0

1982

0

0

73

0

0



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OCR for page 298
Endangered and Threatened Species of the Platte River Appendix D Input Data for Figures 5-6A and 5-6B “Use-days” is combined number of days that each crane spent on the Platte River in fall and spring of that year, “sightings” are numbers of cranes in fall and spring of that year seen on the Platte River, “population” is the total number of cranes in the Aransas-Wood Buffalo population during that year, “ratio” is the number of cranes divided by the number of birds in population, and “use ratio” is the number of use-days divided by total population in that year. Double counts of crane sightings in Platte River were omitted. Data collected prior to 1975 were not used in these analyses because the data collection effort was extremely variable before 1975. Data for 2003 were not yet complete during committee’s deliberations. Year Use-Days Sightings Populationa Ratio Use Ratio 1950 1 1 31     1959 2 2 33     1966 10 2 43     1974 4 2 49     1975 36 12 57     1976 0 0 69 0 0 1977 1 1 71 0.01408 0.01408 1978 0 0 75 0 0 1979 0 0 76 0 0 1980 6 2 78 0.02564 0.07692 1981 0 0 73 0 0 1982 0 0 73 0 0

OCR for page 298
Endangered and Threatened Species of the Platte River Year Use-Days Sightings Populationa Ratio Use Ratio 1983 13 8 75 0.10667 0.17333 1984 0 0 86 0 0 1985 10 7 97 0.07216 0.10309 1986 12 3 110 0.02727 0.10909 1987 40 5 134 0.03731 0.06716 1988 41 3 138 0.02174 0.2971 1989 34 8 146 0.05479 0.23288 1990 12 6 146 0.0411 0.08219 1991 0 0 132 0 0 1992 25 15 136 0.11029 0.18382 1993 19 10 143 0.06993 0.13287 1994 18 14 133 0.10526 0.1203 1995 14 8 158 0.05063 0.08861 1996 34 15 160 0.09375 0.2125 1997 80 10 182 0.05495 0.43956 1998 120 10 183 0.05464 0.65574 1999 24 5 188 0.0266 0.12766 2000 45 4 180 0.02222 0.19444 2001 7 7 176 0.04545 0.1875 2002 151 17 185 0.08649 0.67568 aPopulation data are from Lewis et al. (1994) and Canadian Wildlife Service and U.S. Fish and Wildlife Service, unpublished report (2003).

OCR for page 298
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