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uUdU0J. Ziewitz, Sidle & Dinan: Nesting Least Terns and Piping Plovers 11 ,.. " (a) " E , -" . ~ 0 " Vi . '.' > & " 0.' " April ,., (b) I . ~ 0 ,., Vi . > & 0.' April .." '.40 (e) '" E .........'.00 . ~ 2' 0.10 ~ ~ 0.<<1 & o.~ 0.20 000 April , , _. :-1 . LllostTernNesls ~io: ..,. + Pip'r"g Plover Nests .. .:- o. . , , . 0.. , " May June July . ,. ::.(..... ....... .a. .".4" ""-0.-+:.+ ": i .. +~ f( .. _ooA , . May June July .. ____ Nests on cleared ,sland / . " May June July Figure 5. River stages and elevations of interior least tern and piping plover nests on the Platte River during 1988; (a) below the Elkhorn River confluence (USGS gage near Louisville); (b) below the loup River confluence and above the Elkhorn confluence (USGS gage near North Bend); and (c) nest elevations below Lexington and above Chapman (USGS gage near Grand Island). The mean elevation of nests above the stage of 11.3 cms was 0.34 m (Table 4). Using a paired sample t-test, this was not significantly different than the mean elevation of nest sites (x=0.30 m, t=-0.13, P=O.90). The mean maximum nest elevation (0.43 m) was not significantly different from the mean maximum elevation of the nest sites (x=0.81 m, t=-2.63, P=0.06). The mean elevation above water on the nest initiation dates for the 13 nests surveyed on the Central Platte was 0.39 m (range 0.12 m to 0.70 m). Eight of these 13 nests failed due to inundation (Lingle 1988). The computed river stages associated with nests and the April-July river stages measured at the Grand Is- land gage are plotted in Fig. 5c.