Figure 15.4. Differences in success between lineages in a phylogeny influence the shape of the tree.

Figure 15.4

Differences in success between lineages in a phylogeny influence the shape of the tree. All trees shown with their ancestral node on the left. Time increases from left to right. (a) Shape when all lineages survive. This corresponds to a star phylogeny when drawn as in fig. 15.3 with lineages radiating out from the ancestor in the center of the phylogeny. (b) Tips that stop in the middle of the tree represent lineages that have gone extinct. Some extinctions occur in this case, but many different lineages have survived to the present. (c) Greater differential success between lineages; however, no single winner emerges in any time period. (d) Only a single lineage survives over time, shown in bold. In each time period, a single lineage gives rise to all survivors a few generations into the future.

From: Chapter 15, Measuring Selection with Population Samples

Cover of Immunology and Evolution of Infectious Disease
Immunology and Evolution of Infectious Disease.
Frank SA.
Princeton (NJ): Princeton University Press; 2002.
Copyright © 2002, Steven A Frank.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.