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SEcnONFOUR leaslTem I ,I J I 1 1 j Missouri River downstream from Gavins Point Dam 400 adults Lake Oahe 100 adults Missouri River downstream from Fort Randall Dam 80 adults Other Missouri River sites 20 adults Cheyenne River 80 adults Nebraska 1,520 adults (includes 400 shared with South Dakota on the Missouri River) Missouri River downstream from Gavins Point Dam Niobrara River Loup River Platte River 400 adults 200 adults 170 adults 750 adults As shown, recovery goals for the least tern on the Platte River (Lake McConaughy, North Platte River, South Platte River, central Platte River, and lower Platte River) represent over 35 percent of the recovery goals for the entire Missouri River System. Census on the Platte River during the 1 O-year period (1988 to 1997) annually reported between 450 and 700 adult least terns (Table 4-1). Locations of known nesting habitat appear to be available from annual monitoring and will be provided in Appendix A when it has been compiled by FWS. Location and quantification of potential nesting areas may be approximated by mapped locations of the beacb/bar cover type in the BOR GIS database, but the adequacy of using these data will need to be evaluated when the data are available. Annual adult least tern surveys provide a generally adequate baseline for assessing charges in population size and distribution during the breeding season. They may not support more detailed monitoring of population size or structure. For example, data have been recorded as numbers of birds and not breeding p::1irs_ ,1 1 ,1 I 4.6 SUITABILITY OF THE EXISTING BASELINE FOR MONITORING \ NPPD data provides an adequate baseline for assessment of reproductive success, including number of nests, nest fates, and fledging rates, at the NPPD managed and monitored sites. Comparable data are not available for most unmanaged nesting sites, except for some specific research studies. These unmanaged areas are likely to have lower reproductive success. There are few data on chick and adult survivorship and return rates. The Chadwick and Associates, Inc. 1990-1995 fish data provide an adequate baseline for monitoring of forage fish. 4- I 0 ".OC972ll6OOh1.<loC 6/2t1999l'oS2 AM)lURSGWC.S12 _ tniBtJI' tIIlN~ t:IJIIe FetlInI SerrIces