Answered: In island radiations we often see the…

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter29: Life Cycles Of Flowering Plants

Section: Chapter Questions

Problem 4SQ: In flowrers, the structures that produce male gametophytes are called ______; the structures that...

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1. In island radiations we often see the following pattern: similar forms found in different species living in similar habitats on different islands. This pattern raises the question: did the form evolve once on a single island in a single species and then spread to multiple islands by dispersal (let’s call this the “dispersal model”)? Or did a single species first disperse to different islands, then ecologically adapt to the many different environments on each (let’s call this the “convergence model”)? A phylogeny can help us identify which of these processes is at play. Considering the three traits shown on this tree, which model appears to have more support: the dispersal model or the convergence model? Explain how you arrived at this conclusion.

Habit O shrub
| tree
Leaf margin O unlobed
slightly lobed
distinctly lobed
Capitula O homogamous
partially heterogamous
fully heterogamous
S. villosa
S. stewarti
0 S. atractyloides
S. affinis
S. cordata
100 S. microcephala
S. crockeri
S. aspera
S. retroflexa
S. helleri
S. pedunculata
S. baurii
S. gordilloi
S. divisa
S. incisa
- bcghl
- bc
- gi
- gj
- dghk|
- aef
k
0.6
0.5
0.4
0.3 0.2 0.1
O Ma

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