Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
B. Highland dispersal
a) northern
b) southern
came up in Pleistocene
invasion
highland birds via evolution of
lowland forms
upset of glaciation
of little T° depression
(3-4°C.) in tropics
(i.e. maximum glaciation)
dentate Avian w/ distinctive
thermotypes (historically + c
present)
tendency for Atlantic coastal types of
Middle Amer. to move into S.A. rather
than disperse in other direction
Factors 5,6 more r/dp. diverse.
3) elev. of Yucatan = Pleistocene plume.