AT&T; LTE 12:19 AM ecommons.ucsc.edu Part 1. Mechanisms for Adaptive Radiations

Question

AT&T; LTE 12:19 AM ecommons.ucsc.edu Part 1. Mechanisms for Adaptive Radiations The Cambean islands host-150 species of lizards from the Anolis genus. These lizards have been a dlassic example of evolution in action for biologists because they have undergone rapid reproductive isclation and speciation on diflerent islands in dfferent ways. The following figure shows two adaptive radiations on two dfferent islands (Hispaniola and Jamaica), following colonization events by different types of species Trunklcrown vs. Twig colonizing species). al Species of Anolis vary in leg length and tail length Some species are ground dwelling The same adaptive ation of Anolis has occurred on efferent island. starting from different types of colonists 1. Why would a colonization event lead to rapid speciation (adaptive radiation) on these islands? (2 pts) 2. On Jamaica, what tem would you give to a clade that included the original colonizing common ancestor, the twig lineage, the trunkiground lineage, and the Crown lineage? Why? (2 pts) BIOE 200 AL FALL 2016 ADAPTV STUDENT ID: 3. Given the evolutionary history of the islands, does the Twig phenotype on each raits). Why? (2 pts) 4 Wtat are two other mechanisms tat can cause adaptive radiations? (2 pts) 5. What do all three mechanisms that cause adaptive radiations to occur have in common? (2 pts)

Explanation / Answer

1) Adaptive radiation is defined as rapid diversification of new species from a single common ancestor. Adaptive radiation usually occurs when a species is introduced to a new environment. Colonization events will result in adaptive radiation because of the following reasons,

Natural selection will operate under such conditions resulting in the propogation of new positive traits resulting in speciation.

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