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<br />.DiH012 <br /> <br />. <br /> <br />. <br /> <br />Table 4 <br />Harsh and Water Bird Use-Days on <br />Nonte Vista and Alamosa National \Hldlife Refuges (NI,R) <br /> <br />.~cies <br /> <br />Pied-billed grebel/ <br />Hhite-faced ibis <br />American bitternl/ <br />Snowy egretl/ <br />Black-crowned night heronl/ <br />Virginia rai1.~.I <br />Great blue heron.::/ <br />Greater sandhill cran~/ <br />Whooping cran~/ <br />Eared grebe <br />Western greb~/ <br />Hhi te 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 />Honte Vista NWR l../ <br />1979 1S80 <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 />Alamosa N,m 2/ <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 />1,650 <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 />1/ Total acre~ge for Monte Vista M1R not including areas of crops, roadsJ and <br />buildings is 12,876 acres. <br />2/ Total acreage for Alamosa m,R not including areas of crops, roads, buildings, <br />and Hansen Bluff is 10,357 acres. <br />3/ Breeders. <br />~/ Higratory birds of high Federal interest. <br /> <br />527,007 <br /> <br />1,350 <br />1,020 <br />1,000 <br /> <br />74,832 <br /> <br />During 1979-80, use by these three groups of species averaged 64.8 use-days/acre/ <br />seaSon at Honte Vista ~NR. Aerial transects flown by the BR in 1978 indicated <br />significantly higher concentrations of water birds using Hetlands outside <br />Alamosa NHR (which had an 1979-1980 average of 35.1 use-days/acre/season). <br />Because the aerial transects Here 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 estime.te shorebird use-days for the Closed Basin <br />project area. However, the transect data and knoHledge of shorebird habitat <br />preference suggest that Closed Basin project area supports higher <br />use-days/acre/season of wetland than does Alamosa m,R. For the three groups of <br /> <br />40.9 <br /> <br />8.3 <br /> <br />36.2 <br /> <br />7 <br />