The “Progression Rule” of biogeography states that the oldest islands of an archipelago will host the oldest lineages of a radiation and the youngest islands will host the youngest lineages. The...







The “Progression Rule” of biogeography states that the oldest islands of an archipelago will host the oldest lineages of a radiation and the youngest islands will host the youngest lineages. The Hawaiian islands offer a number of examples of progression, one of which is depicted below.





First, do Darwin’s Giant Daisies follow the Progression Rule? Second, describe a historical process of diversification and dispersal that might be responsible for the pattern you actually observe for Scalesia. This needn’t be completely precise—I don’t want every dispersal event documented!—just sufficient to capture the general process. (as a hint, he told me to consider speciation, extinction, and/or dispersal as the historical processes)












A<br>Каиаi<br>(5.1 МҮ)<br>Oahu<br>(3.7 МY)<br>Molokai<br>(1.9 МҮ)<br>Маui<br>(1.32 МҮУ)<br>Наwaii<br>(0.4 МУ)<br>

Extracted text: A Каиаi (5.1 МҮ) Oahu (3.7 МY) Molokai (1.9 МҮ) Маui (1.32 МҮУ) Наwaii (0.4 МУ)
S. villosa<br>S. stewartii<br>S. atractyloides<br>bcgh S. affinis<br>S. cordata<br>bc<br>a 0.6<br>0.75<br>S. microcephala<br>S. crockeri<br>1.1<br>- gi<br>S. aspera<br>S. retroflexa<br>S. helleri<br>b<br>i1.7<br>g+1.7<br>1:5<br>0.04<br>- gj<br>dghk S. pedunculata<br>- aef S. baurii<br>S. gordilloi<br>S. divisa<br>S. incisa<br>2.9<br>3.2<br>0.65<br>h<br>k<br>1.9<br>*ages of islands shown in millions of years<br>0.6 0.5 0.4<br>0.3<br>0.2 0.1<br>O Ma<br>

Extracted text: S. villosa S. stewartii S. atractyloides bcgh S. affinis S. cordata bc a 0.6 0.75 S. microcephala S. crockeri 1.1 - gi S. aspera S. retroflexa S. helleri b i1.7 g+1.7 1:5 0.04 - gj dghk S. pedunculata - aef S. baurii S. gordilloi S. divisa S. incisa 2.9 3.2 0.65 h k 1.9 *ages of islands shown in millions of years 0.6 0.5 0.4 0.3 0.2 0.1 O Ma

Jun 11, 2022
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