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Mixed Diglossini, Mar. 11, 1966, II [[circled]] 31 [[/circled]] [[underlined]] pending variation within the "mixed tanager assemblage" are neither correlated with one another nor adaptations to exactly the same sets of conditions. [[/underlined]] March 12, 1966 Atacaso Going to work in the same place, below San Juan, again today. Arrive 5:58 am. Just starting to get light. Rather thick cloud cover. Everything quiet. Walking up road. Hear first [[underlined]] rufinucha [[/underlined]] Whistle Song 6:05 am. NODWAH. But overlapping thrush Song at random. Then hear another [[underlined]] rufinucha [[/underlined]] Singing. Also NODWAH. This bird is in [[underlined]] exact [[/underlined]] same place where [[underlined]] torquatus [[/underlined]] was seen and heard yesterday. I.E. territories of the 2 species overlap. [[underlined]] torquatus [[/underlined]] not visible or audible now. A few feet further on, hear [[underlined]] torquatus [[/underlined]] Whistles. Quite far down hill. [[underlined]] Definitely overlapping with rufinucha Songs at random [[/underlined]] Both inds. Singing very frequently. And [[underlined]] certainly [[/underlined]] they must be able to hear one another's Songs. [[margin]] Gen [[/margin]] This is another indication that the inhibition of [[underlined]] rufinucha [[/underlined]] Songs by Diglossa is highly specialized. [[underlined]] rufinucha [[/underlined]] stops 6:13. [[underlined]] torquatus [[/underlined]] continues. NODWAH. Then [[underlined]] rufinucha [[/underlined]] resumes. Again complete overlaps at random. Then both species shut up. Then there is a whole burst of Rfl's. Typically [[underlined]] nigrocristatus [[/underlined]] in form. Then [[underlined]] rufinucha [[/underlined]] Sings a few more phrases. At least some partial overlaps Rfl's Then [[underlined]] rufinucha [[/underlined]] shuts up again.
Transcription Notes:
Atlapetes rufinucha