Lecture_43 History of Life

Lecture_43 History of Life - ANNOUNCEMENTS May 7 Were All...

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ANNOUNCEMENTS – May 7 • Final Exam Review, May 11, 2:00 – 4:00, 100 PH (Phillips Hall) Lecture on Friday • Check clicker scores in ICON; last update May 2. If you have replaced your clicker recently, send me the ID; especially if you have a clicker with one of the following IDs: 954520 or 967EAA Get your own clicker out and ready. Loaners available if you need one. We’re All Light by XTC
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2 5 History of Life
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History of Life: Learning Goals Physical changes in the planet have shaped the diversity of living organisms Changes chemical and climatic features of earth are coupled with the evolution of living systems Periods of quiescence, radiation, extinction and transition are evident in the fossil record
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History of Life: Key Terms
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History of Life: Learning Goals & Objectives Physical changes in the planet have shaped the diversity of living organisms § Describe the relationship between physical isolation and formation of species. § Relate current distributions of organisms to historical patterns of continental drift.
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Origin of the Isthmus of Panama doi:10.1371/journal.pone.0002791 wikepedia.org Final closure of the Isthmus completed approximately 2.8 mya.
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Allopatric Speciation of Marine Organisms due to the Rise of the Panamanian Isthmus Organisms Surveyed 9 clades of Echinoids 38 clades of Crustaceans 42 clades of Fishes 26 clades of Molluscs Genetic divergence due to separation by the isthmus likely in 34 clades, divergence precedes the Isthmus in 73 clades, and 8 still maintain common gene pool. Reproductive isolation from the closing of the isthmus evident in many clades.
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Continental Formations through History Position of the continents has changed dramatically over time. What is responsible for the unique mammalian fauna of Australia?
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Historical Biogeography • Uses the historical distribution of terrestrial and marine environments and phylogenetic relationships to interpret the distributions of organisms. • Current distributions are a product of vicariance, dispersal, speciation and extinction. • These events are recorded in species relationships within a geographic context.
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Continental Formations through History monotremes other eutheria 103 mya 148 mya 166 mya marsupials
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