Sunday, December 08, 2019

Big Picture Science for Dec 09, Shell on Earth












Big Picture Science - Shell on Earth

(Repeat) We all may retreat to our protective shells, but evolution has perfected the calcite variety to give some critters permanent defense against predators.  So why did squids and octopuses lose their shells?  Find out what these cephalopods gained by giving up the shell game.

Plus why Chesapeake Bay oyster shells are shells of their former selves.  What explains the absence of the dinner-plate sized oysters of 500,000 years ago, and how conservation paleobiology is probing deep time for strategies to bring back these monster mollusks.

Also, was the Earth once encased in a giant, continental shell?  A new theory of plate tectonics.  Land ho!

Guests:
  • Rowan Lockwood – Conservation paleobiologist at the College of William and Mary.
  • Al Tanner – Ph.D. student in paleobiology at the University of Bristol, U.K.
  • Mike Brown – Professor of Geology, University of Maryland
This repeat podcast was previously released on 03/27/2017

Download podcast at - http://bigpicturescience.org/episodes/shell-on-earth

You can listen to this and other episodes at http://bigpicturescience.org/, and be sure to check out Blog Picture Science, the companion blog to the radio show.

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