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<br />..nd yellow'`lroat.~ Of t`:ese species, only the yellowthnxt was observed in <br />sufficient n~rbers to exhibit an affintity for the type. <br />L^~laru: sagebrush. The sagebrush vegetation type suppor wed a total of eight <br />passerine species during the June, 1979 census. The violet-green swallow <br />and red-winged blackbird Were ~'+_e frost abundant species observed. The <br />sacebrush habitat supported the lc~caest total avian population of all types <br />sv^pled (22.7 individuals/:ar). The Shannon-Weiner species diver- <br />sity index (1.52) was relatively high because the number of observations was <br />equally c'istributed among species. Bullock's oriole and the barn swallow - <br />were observed only in the sagebrush; however, neither were observed in <br />sufficient ni.^n5ers to indicate an affinity for this habitat. <br />Grassland pasture. The grassland pasture vegetation type was the most haro- <br />aeneous vegetation type sampled and accordingly, the least diverse in terms <br />o£ nunbers of bird species observed (4). The western meadowlark represented <br />at lest 755 of all sightings during the June, 1979 census. Due to the low <br />number of species observed and tlae daninance by the western meadowlark, the <br />Sttivuwn-h~einer species diversity index in this type w®s lowest (0.69) of <br />all types sampled. The total avian population supported by this habitat <br />was 26.0 individuals/}m; the lowest of all species sampled after upland <br />sagebrush (22.7 individuals/lap). <br />Impor'...ant breeding passerine birds. ZWent-y-two different avian species <br />were encountered along the breeding bird transacts eonclucted in the five <br />vegetatim types surveyed. Abundant passerine species in decreasing order <br />of relative abundance during June, 1979 census ware: red winged blackbird, <br />violet-queen swa'_low, catcron crag, and western meadowlark. All of these <br />species except western meadowlark were observed in at least four of the five <br />vegetation types sampled. <br />Red-winged blackbird. The red-winged blackbird was the frost abundant species <br />observed on the study area averaging 19.5 invididuals/lmi over all habitats. <br />This ubiquitous species was encountered on aTl five vegetation types and was <br />the most abunca~rt species in each type. The red-winged blackbird is gre- <br />~- various and `eods, f1yS and roosts in flocks. It was most abtmdant in ripar- <br />ian and alfa.tfa field ^a'~itats a1d showed an affinity for these types. <br />-33- <br />JUNlf 1980 <br />• <br />(Revised August 2006) Attachment 2.04.10-10-40 <br />