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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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scenarios in relation to Platte River habitat needs for migratory whooping cranes in <br />the AWP. The approximately 2900 -acre habitat complex per each of 10 bridge <br />segments (such as that described in the Platte River Management Joint Study and <br />referenced in the Cooperative Agreement) is preferred over smaller units. However, <br />smaller units may still be beneficial to whooping cranes if they contain suitable <br />whooping crane habitat and are sufficient in number and spacing to be detectable to <br />cranes flying over the Platte River. Therefore, some flexibility in layout and size of <br />the complexes could be accommodated, but these areas should be protected from <br />disturbance and contain certain key habitat parameters (e.g., wide, wet river <br />channels, wet meadows, lowland grasslands). There is a need for more research on <br />what habitat best provides benefits for whooping cranes along the Platte River. <br />These habitat complexes should not be a substitute for maintaining the ecological <br />integrity of the Platte River system. Existing suitable habitat should remain along <br />the central Platte River exclusive of future restored and managed habitat. There are <br />other species, including sandhill cranes, that require substantially more roosting <br />habitat than would exist only in these habitat complexes. Ultimately, whooping <br />cranes may also be adversely impacted if sandhill cranes become overcrowded by <br />lack of habitat and reduced food base. <br />Present information suggests significant migration movement of whooping cranes <br />west of the central Platte River. 62 However, there is little suitable stopover habitat <br />in that western reach (North Platte to Lexington). Benefits to whooping crane <br />distribution would incur by protecting and managing habitat along the Platte River <br />west of Lexington, similar to habitat complexes proposed for the central Platte River. <br />However, the same intensity of management as in the central Platte River may not be <br />feasible or possible west of Lexington, primarily because of the lower flow <br />conditions upstream of the J -2 Return near Lexington. <br />B.S. Detection of Whooping Crane Use and Population Trends on the Platte <br />River <br />The whooping crane group at the September 2000 workshop was unable to develop <br />specific numbers objectives for whooping cranes on the Platte River primarily <br />because (1) survey techniques currently do not detect all use by whooping cranes, <br />and (2) the erratic and low annual crane use may make statistical analysis difficult. <br />B.5.1. Survey Techniques <br />In the mid to late - 1980's, surveys were intensive, with daily flights of the river <br />in April and October. Surveys since that time were mostly limited to <br />responding to reported sightings. Migration for all individual whooping cranes <br />is highly variable, but can occur from mid - February to mid -May in the spring <br />and from mid - September to early January in the fall and winter. Thus, the <br />survey period is extensive and daily surveys would be necessary if a count of <br />62 FWS records, Grand Island, Nebraska. <br />22 <br />
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