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<br />. 0 00.9:S 9 <br /> <br />. <br /> <br />. <br /> <br />Tab 1e 4 <br />Marsh and Water Bird Use-Days on <br />Monte Vista and Alamosa National wildlife Refuges (NWR) <br /> <br />Species <br /> <br />Pied-billed grebe* <br />White-faced ibis <br />American bittern* <br />Snowy egret* <br />Black-crowned night heron* <br />Virginia rai1* <br />Great blue heron** <br />Greater sandhill crane** <br />Whooping crane** <br />Eared grebe <br />Western grebe** <br />White pelican <br />Horned grebe <br />Green heron <br />Sora rail <br />Common egret <br />Total <br /> <br />Use-days/acre <br /> <br />Use-days/acre average <br /> <br />Monte Vista NWR <br />1979 1980 <br /> <br />3,356 <br />3,550 <br />3,190 <br />650 <br />1,650 <br />4,000 <br />750 <br />388,150 <br />217 <br /> <br />405,513 <br /> <br />31.5 <br /> <br />A1amosa NWR <br />1979 1980 <br /> <br />1,863 <br />2,050 <br />3,600 <br />520 <br />4,500 <br />4,000 <br />570 <br />509,100 <br />406 <br />360 <br />20 <br />18 <br /> <br />3,175 <br />4,720 <br />2,520 <br />9,250 <br />5,200 <br />1,800 <br />3,772 <br />40,800 <br />65 <br /> <br />160 <br /> <br />1,350 <br />1,020 <br />1,000 <br /> <br />527,007 <br /> <br />74,832 <br /> <br />40.9 <br /> <br />8.3 <br /> <br />36.2 <br /> <br />* Breeders. <br />** Migratory birds of high Federal interest. <br /> <br />1,650 <br />3,150 <br />3,950 <br />2,100 <br />7,600 <br />900 <br />2,970 <br />53,100 <br />119 <br /> <br />80 <br /> <br />120 <br />960 <br />1,000 <br />10 <br />77 ,949 <br /> <br />8.6 <br /> <br />8.4 <br /> <br />During 1979-80, use by these three groups of species averaged 64.7 use-days/acre/ <br />season at Monte Vista NWR. Aerial transects flown by Water and Power in 1978 <br />indicated significantly higher concentrations of water birds using wetlands out- <br />side A1amosa NWR (which had an average of 35.1 use-days/acre/season). Because <br />the aerial transects were designed to reveal rough estimates of differential <br />habitat use and not intended to produce population estimates, those transects <br />cannot be used to estimate shorebird use-days for the Closed Basin project area. <br />However, the transect data and knowledge of shorebird habitat preference suggest <br />that Closed Basin project area supports higher use-days/acre/season of wetland <br />than does Alamosa NWR. For the three groups of species we estimate 40 use-days <br />per wetland acre per season or a total of 1.7 million use-days during the <br />breeding season within the Closed Basin project area. <br /> <br />6 <br />