Notice of Hearing on the Application to Use Sodium Fluoroacetate ...

in cnz iac.:?r thr2o pars ,\ere 13, 2 , and 21 Fsrcznc, r2saec=iL/e;y
<strong>of</strong> thos? caughc in !Wl, 9rior :he 382 <strong>of</strong> 1080. The nunkrs <strong>of</strong>
coyores caught in Colorado and ?lew ~Vexico in 1950 I,uere substan~ial ly
below the numbers caught in 1941. 8y 1960 and 1970, however, coyotz
catches equal lzd or exceeded the 5 941 catch. Val idity <strong>of</strong> this index
is, <strong>of</strong> tours?, dependent ypon 3 consxant level <strong>of</strong> tr2~iine ei7or-L.
Gr. 'iagner pi nEd o u ~ that these rzsui ts appezred co sarall2i ,iai:a
in his i naex, i .e., an apparen rsducti on in coyor2 n~mbers in
Wyoming, but 1 iczlo, if any, effect in Colorado and ?kw Mexico
during me cuo-deczde period <strong>of</strong> i080 uss. rie no~ed :ha1 ehe daca
suggest2d tha; iC8O nay have rlduc2d coyox2 pooula~ions maz?rially
in tn? normern and c2ntral incermoun~ain states, but had no
si gni f icanr impact on sta~ewi de coyote populations in ;he nore
southerly s~a.t~s. The aDparent reducxion in coyote populations in
Idaho, Ldyaming and Colorado did not appear tc resul? in a corresponding
decrease in predation (finding 41 ) .
107. in an effort to measure trends in coyote and other pradat~r ?OCL~IZLLICTIS,
che FWS in 1972 developed an annual netlaork <strong>of</strong> "sc~nt-post 1 ines" in
18 states. A scent-line consists <strong>of</strong> 50 scent stations spaced at
0.3 mile intervals totaling approximately 15 miles in length. A
scent station consists <strong>of</strong> a three-foot circle <strong>of</strong> bare, smoothed or
sifted earth in the center <strong>of</strong> which is placed a capsule <strong>of</strong> scent
attractive to coyotes and other carnivores. Observers check the