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<br />/ :.nd }'ellow'_^roat. O° these species, only the yellowthn>at was observed in <br />sufficient n~r'x~rs to exhibit an aE_fi~ticy for the type, <br />C*~land sagebrush. The sagebrush vegetation type supported a total of eight <br />passerine species during the June, 1979 census. The violet-green swallow <br />and red-winged blackbird were the nest abundant species observed. The <br />sacebivsh :+abi tat supported the lowest total avian nooulat ion of all types <br />sor.?~'_ed (22.7 individuals/`ar). The Shannon-Weiner-species diver- <br />sity inde.~ (1.52) was relatively high because the number of observations was <br />errually c'istributed acrong species. Bullock's oriole and the barn swallow _ <br />were observed only in the sacebrush; however, neither were observed in <br />sufficient nt~rs to indicate an affinity for this habitat. <br />Grassland pasture. The grassland pasture vegetation type was the most homo- <br />geneous vegetation type sailed and accordingly, the least diverse >n terns <br />of n~Nxu's of bird species observed (9), The western meadowlark represented <br />at least 753 of all sightings during the June, 1979 census. Due to the low <br />number of species observed and thedominance by the western meadowlark, the <br />Shannon-hhiner species diversity index in this type was lowest (0.69) of <br />all dyes sampled. The total avian population supported by this habitat <br />was 26.0 individvals/IaT; the lowest of all species sampled after upland <br />sagebrush (22.7 individuals/lan). <br />Lm.~or`ant breeding passerine birds. 'I~nty-two different avian species <br />were enmunte_~ed along the breed=zg bird transects conducted in the five <br />vegetation types surveyed. Abundent passerine species in decreasing order <br />of relative abundance during June, 1979 census were: red-winged blackbird, <br />violet-green swallow, ocnrrcan crow, and western ~readowlark. A11 of these <br />s_.xcies except western meadowlark sere observed in at least £our of the five <br />vegetation types sailed. <br />Red-winged blackbird. The red-winged blackbird was the most abundant species <br />observed on the study area averaging 19.5 invididvals/lan over all habitats. <br />This ubirn•; tons species was encountered on al:l fives vegetation types and was <br />the !rost abu~da~t species >s each type. The red-winged blackbird is gre- <br />garious and `e.~c's, "_ys and roosts ire flocks. It was most abun -'cant in ripar- <br />ian and al `aL`a field habitats aid shoved an affinity for these types. <br />-33- <br />J U N 1 1 1980 <br />• (Revised July 2006) Attachment2.O4.11-1-40 <br />