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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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Template:
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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There are 17 bridge segments between Lexington and Columbus. Not all of <br />these bridge segments may be able to support a colony of least terns. In <br />addition, it may take many nesting sites to form a colony. According to <br />average colony sizes (6 tern pairs per colony)38, there would need to be 25 tern <br />colonies to meet the recommended objectives. To spread the birds out as <br />much as possible, a significant portion of nesting birds should occur both in <br />the upstream and downstream sections of the central Platte River. Kearney is <br />chosen as the splitting point. The rationale for choosing the splitting point at <br />Kearney and for a broad distribution of birds is the same as discussed for the <br />piping plover in section A.5. Lb. <br />A.5.2.c. Fledge Rates <br />The fledge rate objective for the central Platte River should be 0.70 fledglings <br />per pair for a 3 -year running average for least terns. This recommendation is <br />based on current recruitment rates on the Platte River for various habitats over <br />the last 10 years, literature referenced, and discussions at the September 2000 <br />workshop. The following fledge rates are summarized data only to compare <br />current productivity on the Platte River to recommendations in the literature. <br />Sand pits managed by power districts = 0.99 tern chicks fledged/nest39 <br />(0.90 tern chicks /pair)40 <br />Unmanaged sand pits = 0.43 tern chicks fledged/nest39 <br />River dredged islands = 1.04 tern chicks fledged/nest39 <br />Lower Platte managed sand pits = 0.88 tern chicks fledged/pair4l <br />Lower Platter River sandbars = 0.21 - 0.73 fledglings /pair (1987 -90)42 <br />Lower Platte River sand pits = 0.28 - 0.64 fledglings /pair (1987 -90)42 <br />Lower Platte River unmanaged sand pits= 0.50 tern chicks fledged/pai0 3 <br />Lower Platte River sandbars = 0.68 tern chicks fledged/pair44 <br />In addition, in 2000 and 2001, an index of lower Platte River productivity was <br />generated by using the number of pairs observed on the river during the <br />summer airboat census, and the number of fledglings observed on follow -up <br />airboat surveys. The estimated fledge rate for the river was 0.44 tern <br />38 Nebraska Game & Parks Commission survey data. <br />39 Nebraska Public Power District data. <br />40 Central Nebraska Public Power & Irrigation District data. <br />41 Nebraska Game & Parks Commission data. <br />42 Kirsch, E. M. Habitat Selection and Productivity ofLeast Terns on the Lower Platte <br />River, Nebraska. Wildlife Monographs, No. 132, January 1996 <br />43 Nebraska Game & Parks Commission data for years 1984, 1986, 1990, 1993, 1994, <br />1997, and 1998. <br />44 Nebraska Game & Parks Commission data for years 1986, 1987, 1988, 1989, 1990, <br />1991, 1994, and 2001. <br />14 <br />
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