Episode 43 - The Great American Biotic Interchange (GABI)

The Common Descent Podcast

Common Descent

Science, Natural Sciences, Education, Earth Sciences, Science:natural Sciences

4.8 • 764 Ratings

🗓️ 9 September 2018

⏱️ 102 minutes

🔗️ Recording | iTunes | RSS

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Summary

For tens of millions of years, North and South America were separate sisters across the sea, each with their own unique ecosystems. But around 3 million years ago, the Isthmus of Panama brought the landmasses together and kicked off an incredible mass migration of life between the continents. Some species thrived, others suffered, and in the end the very ecosystem structure of both continents was drastically altered, setting the stage for the American wildlife we know today. In the news: prehistoric parasites, early turtle evolution, teeth through time, and a surprising hominin hybrid. Also, a devastating museum fire in Brazil. Time markers: Intro & Announcements: 00:00:00News: 00:06:00Main discussion, Part 1: 00:38:30Main discussion, Part 2: 01:04:00Patron question: 01:35:00 Check out our blog for bonus info and pictures: http://commondescentpodcast.wordpress.com/ Follow and Support us on: Patreon: https://www.patreon.com/commondescentpodcast Twitter: https://twitter.com/CommonDescentPCFacebook: https://www.facebook.com/commondescentpodcast/PodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduw The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org. Muscial Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0http://creativecommons.org/licenses/by/3.0/

Transcript

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0:00.0	You're listening to the Common Descent Podcast.
0:19.0	Hi, Will. Hello, David.
0:21.8	Hello, listeners, and welcome to episode 43 of the Common Descent podcast.
0:28.6	We are back in different states as it is meant to be.
0:32.1	We are, yes, we are back in our original place.
0:35.6	Today, we are talking about the great American biotic interchange.
0:43.2	I would sure wish you had a shorter term that we could use for that.
0:46.4	It's known to its friends as Gabby.
0:48.7	Ah, there we go.
0:50.5	The Gabby is certainly one of the top, most important geological events of the last 60 million years or so.
0:59.9	This is the event when North and South America reconnected after tens of millions of years of separation
1:08.1	when the Isthmus of Panama was created, and it led to all sorts
1:13.7	of interesting side effects, including a huge exchange of northern critters with southern
1:20.6	critters.
1:21.7	This shaped the ecosystems we have today.
1:26.2	We're going to talk about what it was like before the Gabby,
1:30.1	what it was like during the Gabby, what it's like now,
1:33.1	and which of the creatures that we are familiar with today
1:36.1	were inherited in their current position from this event.
1:39.9	Yeah, what animals would we not have if this had never happened?
1:43.9	Yes, this is a much-requested subject. It was requested by Nibb. What animals would we not have if this had never happened? Yes.
1:45.0	This is a much requested subject.
	...

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