Download pdf 838KB - FAUNA Paraguay
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Johnson and Zink l GENETIC RELATIONSHIPS AMONG VIREOS 429<br />
pre- ffav0viridis<br />
FIG. 2. Schematic representations of four hypothetical scenarios of the biogeographic<br />
history of Vireo olivacew, V. jlavoviridis, and V. “chivi” in North, Middle, and South<br />
America, respectively. See text for additional explanation.<br />
taxon is unpatterned, that of the first derivative taxon is single-hatched,<br />
and that of the most recently derived taxon is crosshatched. The first<br />
three scenarios (A-C) are dispersal models. These assume that the an-<br />
cestral taxon occupied part or all of one of the three current ranges and