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Species Recovery Objectives for Four Target Species in the Central and Lower Platte River
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Species Recovery Objectives for Four Target Species in the Central and Lower Platte River
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Last modified
2/22/2013 12:42:46 PM
Creation date
1/30/2013 4:30:24 PM
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Water Supply Protection
Description
Prepared for the U.S. Fish and Wildlife Service
State
CO
NE
WY
Basin
South Platte
Water Division
1
Date
6/26/2002
Author
James M. Lutey, Subcontractor for URS Greiner Woodward Clyde
Title
Species Recovery Objectives for Four Target Species in the Central and Lower Platte River (Whooping Crane, Interior Least Tern, Piping Plover, Pallid Sturgeon)
Water Supply Pro - Doc Type
Report/Study
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significance could, indeed, be measured, then it may be practical to develop <br />numerical objectives for whooping crane stopovers on the central Platte River. <br />After the September 2000 workshop, Dr. Jim Lewis provided Dr. Doug <br />Johnson, statistician at the USGS, Northern Prairie Wildlife Research Center, <br />Jamestown, North Dakota, with information regarding this issue and requested <br />his analysis of existing whooping crane data. Dr. Johnson concluded that the <br />existing data suggests that the recent (since 1985) increase in whooping crane <br />sightings on the Platte River is only partly due to a larger population and that <br />some of the increase may be due to either greater detectability of birds using <br />the Platte River or increased use of the area. 65 His analysis suggested that <br />managers should be able to detect a doubling of the number of sightings on the <br />Platte River. In addition to Dr. Johnson's analysis, several scientists at the <br />USGS's Midcontinent Ecological Science Center (MESC) in Ft. Collins, <br />Colorado, reviewed Dr. Johnson's analysis and agreed with his conclusions. <br />The MESC has been involved with Platte River whooping crane roosting <br />modeling techniques and other Platte River studies for many years. <br />Based on Dr. Johnson's analysis, it was concluded that managers should be <br />able to detect increased whooping crane use of the Platte River due to factors <br />other than just an overall increase in the AWP (e.g., response to habitat <br />improvements). Therefore, the question regarding the ability to statistically <br />detect a doubling of whooping crane use on the Platte River should be <br />discounted as an obstacle in developing whooping crane use objectives and <br />monitoring protocols. <br />Dr. Johnson's analysis was completed based on information provided by Dr. <br />Lewis. The data was split at 1985, the time when habitat management for <br />whooping cranes first began along the Platte River.66 67 In addition, the <br />analysis was done based on the number of cranes seen, not the number of <br />sightings. Each sighting sometimes includes more than one crane. The <br />analysis of numbers of birds was chosen because of the noted trend for greater <br />numbers of birds seen per sighting as the AWP has increased. This report, <br />however, recommends that a more detailed statistical analysis be completed of <br />65 Douglas H. Johnson, U.S. Geological Survey, Jamestown, North Dakota. E-mail <br />correspondence to Jim Lewis, Statistical Analysis. December 1, 2000. <br />66 Strom, K. 1987. Lillian Annette Rowe Sanctuary -- Managing Migratory Crane <br />Habitat on the Platte River, Nebraska. Pages 326 -330 in Proceedings 1985 Crane <br />Workshop, Platte River Whooping Crane Habitat Maintenance Trust and U.S. Fish and <br />Wildlife Service. 415 pp. <br />67 Lingle, G.R. 1982. Mormon Island Crane Meadows -- Protecting Habitat for Cranes <br />along the Platte River, Nebraska. Pages 17 -21 in Proceedings 1981 Crane Workshop, <br />National Audubon Society, Tavernier, Florida. 296pp. <br />24 <br />
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