moritz10 - Bio1B Evolution 10 Last lecture: Species &...

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1 Bio1B Evolution 10 Last lecture : What is a species anyway? (Pp. 487-492) – Interesting one - Ensatina salamanders Speciation processes (Pp 492-504; Losos & Rickleffs (2009) paper - Adaptive radiations Today hybrid-speciation • Macroevolution: – The fossil record and major transitions 2 Geographic modes of speciation Futuyma 2005 3 Hybrid zones - alternative outcomes after re-contact between lineages Or, new “hybrid species” Fig. 24.14 Or - lineages don’t hybridize and eventually overlap if ecologically distinct 4 Hybrid zone - Bombina variegata- bombina (Fig. 24.13)
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5 A stable hybrid zone in Ensatina Alexandrino et al. 2005 20 yrs later 2nd contact with same lineages 6 Recent (<8kya) expansion from long-isolated (>2 Myr) refugia in the NE Australian rainforest Is there evidence for reproductive isolation? Is there evidence for
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moritz10 - Bio1B Evolution 10 Last lecture: Species &amp;...

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