Laserfiche WebLink
<br />awndartce in one or none habitat type or t:.ose wit:. a Mr-ce distribttticr. <br />C (i.e., found in most habitat types sa~,pled) . <br />Passerine Breeding Habitats <br />Juniper. .ore avian species were ornserved in the jumps vegetation types <br />than in any other type surveyed during the breeding passerine surveys <br />(12 species) . Accoraingly, this type itad the iti.gP.est species diversity <br />index of any type surveyed in t'~e study area (1.91). T:~ structural heter- <br />ogeneity of rite juniper type with its tree stratti.-: proviae irore opporn:n- <br />ities for nesting and feeding "niches" t'ran otter veretatiort types in rite <br />area; as a result, the type cant support a greater variety of bird species <br />and a hi5h e^^--r ,, tiort of• birds. ;iris habitat sap~~. ortefi ttte second iv.c~.^.ast <br />avian popu7.ation (40.0 individuals/)ct) . T:-.e , ost abu:.daztt species observed <br />in this ia3'vitat in decreasing order of relative aoundarce weze: red-winged <br />blackbird, violet-green swallow, western meadowlark, and ATCPrican robin. <br />Z'nree passerine species that ware e:.cnuntesed in the juniper vegetation <br />type but not observed elsewhere dtu-iztg the June, 1979 census were asit- <br />•i throated flycatcher, blue grosbeak and Cassin's firtcit. T:^e western m~&ow- <br />lark and American robin exhibited an affinity for tr~ ~w-tipar vegetatiat. <br />Alfalfa field, A total of nine passerine species was encountered in t1~,e <br />alfalfa field, The xrost abundant species observed in decreasing order. <br />of relative ai-undance were: red winged blackbird, violet-greet swallow, <br />and cliff swallow. This habitat supported the highest total avian popu- <br />iation (45.3 individuals/7act) ,and the third hisnest si-t. ecies diversity i:dex <br />(1.25). T:8 western flycatcher and 'alac)c-billed naypie were onservefi <br />only in the alfaa.fa field during the breeding bi•^d eensi:s. Aocaever, c:.ly <br />the violet green SM*dllOw exhibited a definite affinity for t're alfalfa field. <br />Riparian. The riparian vegetation type supported a total o£ nine avian <br />species. Tne Shannon-Weiner species diversity innex ir. t`v.s habitst was <br />the second lowest of all types sampled (1.21) and the total avian popu- <br />lation was 36.0 individuals/latt. The reel-winged blackbirfi was the moat <br />alrtnnnnt species encountered along the riparian. transect. ;rsee passerine <br />s,'xrciCS observed in this vegetatia-t type a.-td rot observed eisew::ere ~,:rit:g <br />rite June, i's79 census were lone-bil7cd rarsh wre.-t, ora-.ce-c-cn-:.FCi mar:,:er, <br />-32- <br />LJ <br />JUM 1 i t980. <br />(Revised August 2006) Attachment 2.04.10-10-39 <br />