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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 123. No. 2. June 2011 
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* 3 ,' E A 3mP °! ,hC 14 Vanants of Type 1 so "g s Black-throated Gray Warblers within the study area m 
Cr^' T" ? l i f0niia> ' 998 - 2007 Thc variants are (A) Days. <B) Diamond Rock. (C) Grave. (D» 
Cow and (N^ Sto PP 8 ' tG> Em,gram - (H) Humbug. (I) Happy Camp. (J) Smith. (K) Winchuck. (L) Agne^lMl 
approaching a tonal note. The B-phrase consisted 
of 2-5 syllables in all variants, most differing in 
form, frequency, and duration. 
Variants in the upper Rogue River watershed in 
the large central part of the study area were 
arbitrarily chosen as a basis for describing the B- 
phrase and in making comparisons with other 
variants. The B-phrase of songs in the upper 
Rogue River watershed shared a common five- 
syllable pattern (Fig. 2). The occurrence of these 
or similar syllables varied among each of the 
variants (Table 1). 
The first syllable of the B-phrase (B,) was 
relatively long in duration and relatively low in 
frequency compared to other syllables in the son? 
For most it included a brief introductory 1011 '' 1 
note. A second tonal note was often appended to 
the end of the vibrato note. The vibrato note in 
some variants (Grave and Emigrant) was reduo 
to a tonal note in most individuals. 
B ? and B ( were similar in form, frequency. 
duration. The most common form of the sylla * 
began with a vibrato note of relatively to* 
frequency coupled with a tonal note of coos*® 11 ^ 
decreasing frequency. We also observed pa 11 " 
syllables similar to B 2 and B;, in songs north oi 11 f 
study area into the northern Oregon Coast R^’ 
Oregon Cascades east and west of the divide- a n 
