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Mixed Diglossini, May 16, 1965, VI.  (36)

by several typical [[underlined]] carbonaria s.l. [[/underlined]] R-Zaza's.  This [[underlined]] must [[/underlined]], I think, be Laf-Ater dispute.

^[[Laf Ater]] These birds certainly [[underlined]] not [[/underlined]] the same as the Laf and Ater seen disputing the other day.

Leaving 10:48 am

COMMENTS:

^[[Gen]] There really seem to be a surprisingly large number of inter-specific disputes in this area. Especially as there are no overwhelmingly attractive and unusual concentrations of food (such as an Eucalyptus or an Erythrina in bloom) here.

^[[Coer]] I am surprised to find no Coers here. The region is humid - but probably not more humid than the Pico de Espejo in the Sierra de Mérida. And Coers certainly occurred above Chachapoyas, an area which appeared to be relatively dry (for the humid temperate zone).

^[[Gen]] An observer working in the Andes certainly gets the [[underlined]] impression [[/underlined]] that the survival or disappearance of certain particular species in particular areas is leargely a matter of "chance". I.E. when two closely related species (e.g. they Cy and the Coer, or the Firebelly and the Yellowbelly) occur in areas which are more or less equally suitable for both, the ultimate fate of either one or both species may depend upon "accidents".

MORE COMMENTS:

^[[Gen]] I  My very few observations of birds around Popayán would appear to support my hypotheses. In the area where I have worked, there are only comparatively narrow strips of scrub and trees along streams and rivers. These are surrounded by [[underlined]] very [[/underlined]] wide expanses of pasture. I.E. this area is about as "open", on the whole, as any place where members of the