24- speciation pt.2

Question 1

did the anole lizards…

spread from one island to another and then diverged into different species

or

did lizards from each four species spread from island to island?

Answer 1

Hypothesis 1. lizards spread from one island to another then diverged into different species

Question 2

how was hypothesis 1 correct?

Answer 2

it was beneficial to use resources that other lizards are not using (resource partitioning). so different areas of the island = different selection pressures, lizards in different habitat may rarely mate.

i.e. reproductively isolated enough to diverge into different species

Question 3

what is sympatric speciation.

Answer 3

reproductive isolation may occur when populations occupy different habitats and/or use different resources, i.r. beach, forest floor, canopy, trunks. within the same geological area