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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

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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.
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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

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.
×

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).

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.
×

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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.
×
Page 298
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.
×
Page 299
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.
×
Page 300
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The tension between wildlife protection under the Endangered Species Act and water management in the Platte River Basin has existed for more than 25 years. The Platte River provides important habitat for migratory and breeding birds, including three endangered or threatened species: the whooping crane, the northern Great Plains population of the piping plover, and the interior least tern. The leading factors attributed to the decline of the cranes are historical overhunting and widespread habitat destruction and, for the plovers and terns, human interference during nesting and the loss of riverine nesting sites in open sandy areas that have been replaced with woodlands, sand and gravel mines, housing, and roadways. Extensive damming has disrupted passage of the endangered pallid sturgeon and resulted in less suitable habitat conditions such as cooler stream flows, less turbid waters, and inconsistent flow regimes. Commercial harvesting, now illegal, also contributed to the decline of the sturgeon.

Endangered and Threatened Species of the Platte River addresses the habitat requirements for these federally protected species. The book further examines the scientific aspects of the U.S. Fish and Wildlife Service’s instream-flow recommendations and habitat suitability guidelines and assesses the science concerning the connections among the physical systems of the river as they relate to species’ habitats.

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