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Lecture 2 Phylogenetics of Fishes 1. Phylogenetic Systematics 2

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Lecture 2 Phylogenetics of Fishes 1. Phylogenetic Systematics 2 Lecture 2 Phylogenetics of Fishes 1. Phylogenetic systematics 2. General fish evolution 3. Molecular systematics & Genetic approaches Charles Darwin & Alfred Russel Wallace All species are related through common descent 1809 - 1882 1823 - 1913 Willi Hennig (1913 – 1976) • Hennig developed cladistic method to infer relatedness • Goal is to correctly group ancestors and all their descendants Cladistics A clade: 1. All individuals descend from a single ancestor 2. All descendents of that ancestor are part of the clade Cladistics (a.k.a Phylogenetic Systematics) Fundamental approach • divide characters into two groups • Apomorphies: more recently derived characteristics • Plesiomorphies: more ancestral, primitive characteristics • Identify Synapomorphies (shared derived characteristics) • group clades by synapomorphies Cladistics (a.k.a Phylogenetic Systematics) eyes Synapomorphy of rockfish, gills bichir, and sharks? jaws bony skeleton swim bladder Bichir Rockfish Sharks Lamprey Hagfish Cladistics (a.k.a Phylogenetic Systematics) eyes “Ancestral” and “derived” are gills relative to your focal group jaws bony skeleton swim bladder Bichir Rockfish Sharks Lamprey Hagfish Cladistics (a.k.a Phylogenetic Systematics) Monophyletic (aka clade): all taxa are descended from a common ancestor that is not the ancestor of any other group (every taxa descended from that ancestor is included) examples? Cladistics (a.k.a Phylogenetic Systematics) Paraphyletic: the group does not contain all species descended from the most recent common ancestor of its members examples? Cladistics (a.k.a Phylogenetic Systematics) Polyphyletic: taxa are descended from several ancestors that are also the ancestors of taxa classified into other groups examples? Problems with Traditional Cladistics Homoplasies • traits evolved due to convergence - keel: stabilizes tail at high speeds Problems with Traditional Cladistics Statistically inconsistent • can lend more support for the wrong answer Bernal et al. 2001 Problems with Traditional Cladistics Unequal rates • lineages can evolve at different rates Cyprinidae Molecular Systematics & Genetic Approaches Compares similarities and differences in DNA sequences • identify informative sequences (aka synapomorphies) Different parts of the genome evolve at different rates • choose appropriate sequences to compare Address questions about biogeography & evolutionary history that traditional systematics can not African Cichlids & the Great African Rift Lakes Lake Victoria ~400-500 spp. Lake Tanganyika ~180-250 spp. Lake Malawi ~700-1000 spp. Parallel or Convergent Evolution? omnivore omnivore vegetarian vegetarian piscivorous piscivorous carnivore carnivore generalist generalist omnivore omnivore Parallel Evolution Lake Tanganyika Lake Malawi 3 common ancestors Convergent evolution Lake Tanganyika Lake Malawi 1 common ancestor 1 common ancestor Parallel Evolution Predicted Result Convergent evolution Predicted Result Lake Tanganyika Lake Malawi Molecular tree based on cytochrome b sequences 100 Victoria Haplochromines 100 Malawi Haplochromines Group A Malawi Haplochromines Group B 100 100 Astatoreochromis Tanganyika Julidochromis Tanganyika Lamprologus Myrs 6 4 2 0 Molecular Clock Calibration in Sharks • Fossils and geologic events • Calibrate sequence divergence • Establish molecular clock • ~7-8x slower than mammals Martin et al 1992 Evolution of Endothermy - monophyly or convergence? Molecular Systematics & Genetic Approaches Gene trees vs. species trees • gene trees don’t necessarily reflect the species tree The more gene trees you sample, the more likely you converge on the species tree red = gene tree blue = species tree Surfperches (Embiotocidae) 25 Surfperches (Embiotocidae) Longo & Bernardi 2015 Longo & Bernardi 2015 Surfperches (Embiotocidae) Bernardi & Bucciarelli 1999 Surfperches (Embiotocidae) LongoLongo & &Bernardi Bernardi 2015 2015 .
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