the week of Sunday, February 4th, 2018

Wednesday, February 7th, 2018, Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“Land and Sea: Contrasts in Evolutionary History”

      – by Geerat Vermeij, UC Davis

Life originated in the sea and evolved its early metabolic pathways in water. Nevertheless, activities of organisms on land have influenced and enriched marine ecosystems with oxygen and nutrients for billions of years. In contrast to the history of species diversity in the sea and on land and the flows of resources within and between these two realms, little is known about the times and places of origin of major metabolic and ecological innovations
during the Phanerozoic. Many innovations among multicellular organisms originated in the sea during or before the Cambrian, including predation and most of its variations, biomineralization, colonial or clonal growth, bioerosion, deposit feeding, bioturbation by animals, communication at a distance by vision and olfaction, photosymbiosis, chemosymbiosis, suspension feeding, osmotrophy, internal fertilization, jet propulsion, undulatory locomotion, and appendages for movement. Activity is less constrained in air than in the denser, more viscous medium of water. I therefore predict that high-performance metabolic and ecological innovations should predominantly originate on land after the Ordovician once organisms had conquered the challenges of life away from water and later appeared in the sea, either in marine-colonizing clades or by arising separately in clades that never left the sea. In support of this hypothesis, I show that 11 of 13 major post-Ordovician innovations appeared first or only on land. This terrestrial locus of innovation cannot be explained by the Cretaceous to recent expansion of diversity on land. It reveals one of several irreversible shifts in the history of life.

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Thursday, February 8th, 2018, CIG Webinar

2:00 PM, online via zoom

“Pythonic Geodynamics”

      – by Gabriele Morra, University of Louisiana at Lafayette

Students and young researchers who want to learn to use computational tools for geodynamic modeling have the option to choose among a wide range of numerical tools. I will show how Python and its libraries represent an easy-to-use platform for self-learning, with performance close to compiled codes. I will present (1) how to visualize and run vectorial calculations, (2) examples from classical Mechanics like particles trajectories in 2D-3D, (3) a detailed description of how to write Lagrangian, Eulerian and Particles in Cell codes for solving linear and non-linear continuum mechanics problems and (4) advanced techniques like tree-codes, Boundary Elements, Lattice Boltzmann Method, as well as use Jupyter Notebooks for creating and distributing content. The goal is to encourage professional and students to learn by experimenting and experiencing, like children who learn by playing.

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Friday, February 9th, 2018, Friday Brown Bag

12:10 PM, 1316 Earth and Physical Sciences

“Estimating thermal conditions of magma storage for the 1980-86 and 2004-5 eruptions of Mount St. Helens, USA”

      – by Tyler Schlieder

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