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Suggested Citation: "Appendix D: Input Data for Figures 5-6 a and 5-6b." National Research Council. 2005. Endangered and Threatened Species of the Platte River. Washington, DC: The National Academies Press. doi: 10.17226/10978.

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	Population^a	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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Year	Use-Days	Sightings	Population^a	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 (1994) and Canadian Wildlife Service and U.S. Fish and Wildlife Service, unpublished report (2003).

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Endangered and Threatened Species of the Platte River (2005)

Chapter: Appendix D: Input Data for Figures 5-6 a and 5-6b

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

My Academies

Endangered and Threatened Species of the Platte River (2005)

Chapter: Appendix D: Input Data for Figures 5-6 a and 5-6b

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

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