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moritz9-1 - Bio1B Evolution 9 Last lecture Evolution of...

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1 Bio1B Evolution 9 Last lecture : Evolution of sacrifice (altruism) Species & speciation What is a species anyway? (Pp. 487-492) Concepts - typological, biological, phylogenetic Reproductive isolation - mechanisms Easy one? - Humans & living relatives Today Species & speciation What is a species anyway? (Pp. 487-492) Interesting one - Ensatina salamanders Speciation processes (Pp 492-504; Losos & Rickleffs (2009) paper - Introduction & geographic modes Adaptive radiations Hybridization - hybrid zones, reinforcement & hybrid- speciation 2 Ensatina eschscholtzii - One ring species? Or 2 biological species? Or >11 Phylogenetic species k-e overlap; no hybrids k-e overlap; hybrids 3 Geographic modes of speciation Futuyma 2005 4 exiguus aenigma bombiens saxatilis concinnus monticola hosmeri exiguus v aenigma • 5% mtDNA divergence • Large body size & lower freq. call in aenigma concinnus v monticola • 5% mtDNA divergence •concinnus has lower & longer call, distinct morphology Allopatric sister species among northern, montane Cophixalus (Hoskin 2004)
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