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<br />"'" <br />!'... Table 4 <br />:,,1") Marsh and Water Bird Use-Days on <br />'.....; Monte Vista and Alamosa National Wildlife Refuges (NWR ) <br />- <br />'. ,) <br />~",:> Monte Vista NWR Y Alamosa NWR 3./ <br /> Species 1979 1980 1979 1980 <br /> Pied-billed gre bell 3,356 1,863 3,175 1,650 <br /> White-faced ibis 3,550 2,050 4,720 3,150 <br /> American bitter~/ 3,190 3,600 2,520 3,950 <br /> Snowy egret1./ 650 520 9,250 2,100 <br /> Black-crowned night heron1./ 1,650 4,500 5,200 7,600 <br /> Virginia rai1.Y 4,000 4,000 1,800 900 <br /> Great blue hero~/ 750 570 3,772 2,970 <br /> Greater sandhill cran~/ 388,150 509,100 40,800 53,100 <br />,Whooping cran~/ 217 406 65 119 <br /> Eared grebe 360 <br /> Western greb~/ 20 160 80 <br /> White pelican 18 <br /> Horned grebe 1,350 120 <br /> Green heron 1,020 960 <br /> Sora rail 1,000 1,000 <br /> Common egret 10 <br /> Total 405,513 527,007 74,832 77 ,949 <br /> Use-days/acre 31.5 40.9 8.3 8.6 <br /> Use-days/acre average 36.2 8.4 <br /> <br />l/ Total acreage for Monte Vista NWR not including areas of crops, roads, and <br />buildings is 12,876 acres. <br />l/ Total acreage for Alamosa NWR not including areas of crops, roads, buildings, <br />and Hansen Bluff is 10,357 acres. <br />3/ Breeders. <br />!/ Migratory birds of high Federal interest. <br /> <br />During 1979-80, use by these three groups of species averaged 64.8 use-days/acre/ <br />season at Monte Vista NWR. Aerial transects flown by the BR in 1978 indicated <br />significantly higher concentrations of water birds using wetlands outside <br />Alamosa NWR (which had an 1979-1980 average of 35.1 use-days/acre/season). <br />Because the aerial transects were designed to reveal rough estimates of dif- <br />ferential habitat use and not intended to produce population estimates, those <br />transects cannot be used to estimate shorebird use-days for the Closed Basin <br />project area. However, the transect data and knowledge of shorebird habitat <br />preference suggest that Closed Basin project area supports higher <br />use-days/acre/season of wetland than does Alamosa NWR. For the three groups of <br /> <br />7 <br />