CONTENTS 

Abstract e e . . . = = = = . * - . . . . . * . . . . . . . . . = * 
Ree LOM. | Sf 4k ew wl 6, eS A 6 Ow ft wt ee ee 6G ate la s 
Procedure 
The Call—-Count Survey s s ® e s e . . . . - . . . . . . . . +. * 
mice rT Ly anecks. Of Lig Oba. w « = wis s ss els 6 « 2 mp ss ww 
Randomization of call-count routes ..s.«ee «st ees ss @ ee 
Physiographic stratification of call-count routes ....... 
Breeding Density Index ... Syd a sn ae 
Determination of short-term sopitiditon: Shankee. 1970 to 1971 ° 
Determination of long-term a trends by Crea ae to 
TL) oe 4a Se 6 6. a IS syne Sle ol 
Determination of Va pobesig: trends aa physiographic reper. 
MG, EO ber, EE. eae bis e eeae Meee 8g <2 ae 
Determination of changes in Puc tails desodtaten uth the survey, 
m0 tO LOT, & «i « bow > Ws a A ee Oe. eS 
Computer analysis of aoe ati coat Sascey Gate: “Aas 2° 6 » @ 
SLaulselcal evaluation of data. «1 2 «s/s a se eb et oO eS 
Determination of population distribution ......+.+5+ ss 
Findings... - oO we te ERs. SE 
Status of the United Sicha dbus ‘population 
1971 population distribution... oa S ae et 6 ee 4 
1970 to 1971 population changes .. 2 oe 4-8 oom fey te. 9 
1961 to 1971 long-term population Keenas - pi Bee) § “h chiete 
Status of the Eastern Management Unit Pais 
1971 population distribution... ee ee 
1970 to 1971 population changes ... ove tes Se “Oe eh aluek 
1961 to 1971 long-term population trends iter © & oe & 8) a <4 
Status of the Central Management Unit population 
oF. population. -distYabution . . «so» 's # b+ « @ & +e 9% 
1970 to 1971 population changes .. . oe) ee ae te we erie 
1961 to 1971 long-term population br erias ewe Wt ow 6 Me 4’ 
Status of the Western Management Unit population 
1971 population distribution . ....s.e +s» ©» © © ©» wo w © 
1970 to 1971 population changes ....e« «©» se e oe © ew @ 
1961 to TOTl population, trends .. 5 “s « a. we «4 we seed 
Statistical significance of data 
1970 to 1971 population changes ... «6 « » 
1961 to 1971 long-term population trends ......4.464-s 
Acknowl edgments . . . . . ‘ . . . . . . . * . * * . . 7 . . . * . 
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