PPT-Introduction to Exploring K-T Extinction Patterns

Background vs Mass Extinction Background extinction species gradually and continuously go extinct creating a turnover of species through time Background extinction and mass extinction 0 600. ASTR 1420. Lecture. 9. Sections : 4.6, 6.4, 11.3. Mass Extinctions in the Earth History. Mass Extinctions. Check . http://en.wikipedia.org/wiki/Impact_event. http://en.wikipedia.org/wiki/Mass_extinction. The rise and fall of biodiversity. Four major . mass extinctions . of marine organisms:. End of Silurian Devonian, Permian, and Cretaceous). Rise in diversity during Cambrian, Silurian, Cretaceous, and Paleogene. The Sixth Mass Extinction. Essential Questions. What is extinction?. Which species have become extinct in modern times? . What are the characteristics of past mass extinctions? . How do modern extinction rates compare with natural (background) rates?. The sixth . m. ass . e. xtinction. Objectives. Define . extinction.. Give examples of (1) past mass extinctions (2) and recent species . extinctions.. Compare current extinction rates with background extinction . Metapopulation Models. . . Species area curves (islands as case study). Review of Island Biogeography. Extension to subpopulations .  Metapopulation. Classic (. Levins. ). Island-mainland (. Gotelli. Modern Extinctions. In the tropical Pacific, 154 species, mostly birds of large size, those that nested on the ground, and those that were flightless were the first casualties (Boyer 2008, 2009). In . The rise and fall of biodiversity. Four major mass extinctions of marine organisms:. End of Silurian Devonian, Permian, and Cretaceous). Rise in diversity during Cambrian, Silurian, Cretaceous, and Paleogene. Remember. Operant conditioning extinction differs from classical conditioning extinction. During extinction, responding decreases to baseline levels for both classical and operant conditioning. BUT: Operantly conditioned behavior shows:. DARWIN’S UNDERSTANDING VS. PRESENT DAY. How are inheritable traits passed?. How do variations appear?. Today’s understanding of genes, DNA, variation, and mutations is central to our understanding of how evolution works . FOR COMMISSIONERS. PREPARED IN COLLABORATION WITH . JEFF SCHWEIGER, . NATIONAL CAPITAL AREA COUNCIL ASSISTANT COUNCIL COMMISSIONER. National Key 3 Announcement. NOVEMBER 2016. National Commissioner Charles Dahlquist and Chief Scout Executive Mike Surbaugh clarified the purpose of the Commissioner Service to Exploring initiative and charged the field with utilizing Scouting Commissioners as a temporary stop gap while councils develop more comprehensive plans to serve their Exploring units. Here is an excerpt:. Essential Questions. What is extinction?. Which species have become extinct in modern times? . What are the characteristics of past mass extinctions? . How do modern extinction rates compare with natural (background) rates?. . Large . Interstellar Polarisation . Survey. Stefano . Bagnulo. , Nikolai . Voshchinnikov. , Nick Cox (PI). Dust extinction, emission & . polarisation. . in the diffuse ISM. Simultaneously . model :. . . . Species. . A. . group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. .. Speciation. . It.  is the . evolutionary.  process by which populations evolve to become distinct . Good progress:. Define the term extinction. Explain how extinction may be caused.. Outstanding progress:. Explain that organisms become extinct because something changes and the species cannot adapt quickly enough to the new circumstances..