<br />.DiH012
<br />
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<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 />
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