Sun, 20 August 2017
The gang discuss two papers that study how the geographic ranges of turtles and frogs changed through time, and how these changes affected their ecology and evolution. Also, James drinks what he presumes is ground horse, Curt goes full Ian Malcolm, Amanda shares life lessons about furniture, and everyone imagines what turtle they are. [Editor's note: The actual science starts about 13 minutes in, I just didn't have the heart to cut it down.]
Up-Goer Five (Amanda and James Edition): Today our friends talk about animals with hard backs and no hair, and also animals that jump and have little skin. The group looks at two studies that look to see whether where animals are and have been is important. We talk about how animals with hard backs and no hair used to live in many, many places. Today they live in less places. Maybe some day they will live in more places again if it gets warm because of people. But maybe not because some animals with hard backs and no hair do need it to be wet. And if it is not wet when it gets warm again then they will not be able to live in more places again. We don't know. Being wet does seem to matter a lot, though. With animals that jump and have little skin, maybe they changed in place or maybe they went all over the place and changed as they went. We read that people think that they did not change as they went, but rather changed in one place and then went to other places.
References: Waterson, Amy M., et al. "Modelling the climatic niche of turtles: a deep-time perspective." Proc. R. Soc. B. Vol. 283. No. 1839. The Royal Society, 2016. Chan, Kin Onn, and Rafe M. Brown. "Did true frogs ‘dispersify’?." Biology Letters 13.8 (2017): 20170299.
Direct download: Podcast_117_-_Hero_Terrapins_and_Fighting_Frogs.mp3
Category:general -- posted at: 3:00am EST |
Sun, 6 August 2017
The gang discuss two papers that offer new evidence which re-contextualizes our understanding of the evolutionary history of two important Mesozoic groups, dinosaurs and marsupials. Meanwhile, Amanda comes up with a terrible/great new idea for liquor consumption, Curt consistently offers bad advice to his friends, and James cracks open a bottle of sangria and then everything gets a bit fuzzy. Can you guess that this was the fourth podcast recorded in a single week? Can you hear the life drain from James? (Editor's Note: The "science" starts 13 minutes in. Apologies, we will be better in the future. [Editor's Editor's Note: Probably not.])
Up-Goer Five (Amanda Edition): Today our friends talk about very large animals with no hair that everyone loves but our friends don't care about, and also funny animals with hair that are not like us because they do not have big babies. It turns out the very large animals with no hair that everyone loves are all brothers and sisters in a very funny way, not like we used to think at all. The very large animals with no hair that everyone loves have three kinds: long necks that eat leaves, ones that eat other animals, and ones that eat leaves but do not have long necks. We thought that the ones that had long necks and the ones that eat other animals were close brothers and sisters. But it turns out they might not be. The ones with long necks might be the oldest brothers and sisters, then the ones that ate leaves but did not have long necks, and then the ones that ate other animals. With the funny animals with hair that are not like us because they have small babies, they were thought to have started in places other than where our friends live. But it turns out that maybe they actually started where our friends live, and not where other people live across the big waters.
References: Baron, Matthew G., David B. Norman, and Paul M. Barrett. "A new hypothesis of dinosaur relationships and early dinosaur evolution." Nature 543.7646 (2017): 501-506. Wilson, Gregory P., et al. "A large carnivorous mammal from the Late Cretaceous and the North American origin of marsupials." Nature Communications 7 (2016).
Direct download: Podcast_116_-_Changing_Relationships_Dinosaurs_and_Marsupials.mp3
Category:general -- posted at: 3:00am EST |