Podcast 230 - A Rambling Time

The gang discusses two papers that look at topics in biogeography. The first paper reviews the concepts of cradles and museums (and whether we should retire those concepts), and the second paper explores traditionally defined Devonian bioregions. Also, the gang uses the broad topics from both of these papers to talk about a lot of tangentially related topics. Meanwhile, James has strong opinions about what is edible, Curt disagrees, and Amanda remains painfully neutral throughout.

Up-Goer Five (Curt Edition):

Our friends talk about two papers that look at the ways we talk about the places animals come from. The first paper is looking at two words that we use to talk about these places. The words are used to talk about places where new living things come from and places where living things can stick around for a long time. The paper talks about how those words were first used and why they came up in the first place, and then talks about how we have changed what we mean by those words in ways that maybe is not helping us better know about places. They talk a lot about how the way these words were first used has now been forgotten, and so the way we use them today makes things a little too simple. Instead of focusing on finding the simple form of these places, we should be looking at the ways the world works which can make some areas better for new living things to form or for old living things to stick around.

The second paper looks at whether or not animals that are close to each other come from the same places through time. Are there places that have their own types of animals which all come from just those places for a really long time. They look at the whole world a long time ago when people have said that they can find these groups of animals that all come from one place. They look at a lot of other studies and use those studies to run another study. They find that some of the smaller areas may show what people have said in the past, but most of the big areas do not have this long time where all the animals are from this one place. The reason why it may have looked like that in the past may be because of how we got those old animals and the types of people who were allowed to go out and get those old animals in the past.

References:

Vasconcelos, Thais, Brian C. O’Meara, and Jeremy M. Beaulieu. "Retiring “cradles” and “museums” of biodiversity." The American Naturalist 199.2 (2022): 194-205.

Dowding, Elizabeth M., Malte C. Ebach,  and Evgeny V. Madroviev. "Validating marine Devonian biogeography: a  study in bioregionalization." Palaeontology (2021).

Podcast 229 - Non-Fishable Tetrapods

The gang discusses two papers that explore the functional morphology of ancient groups. The first paper looks at soft tissue in ammonites which can be used to infer locomotion, and the second paper looks at how functional morphology changed as tetrapods transitioned from marine to terrestrial environments. Meanwhile, James explores the evolution of baked goods, Curt develops a new business plan, and Amanda dreams of Tiktaalik.

Up-Goer Five (Curt Edition):

Our friends talk about two papers that look into how we can learn how very old animals moved and how that moving changes over time by looking at the parts we can find in the ground. The first paper looks at animals with a lot of arms who live in a big hard round hard part. Today, while we have a lot of these animals with lots of arms, only one of those animals today lives in a big round thing. In the past, there was a big group of animals that lived in a round thing, but they did it in a different way than the one we have around today. However, because it is hard to find pieces that are not hard, we have used the animal that is around today as our best guess for how these old animals may have moved. This paper finds some soft pieces which give us a better idea of how the soft parts that allow animals to move were put together. And these old animals probably moved in a very different way from the other animal from today who lives in a round thing. In fact, the old animals that live in round parts may have moved in a way that is sort of like how the animals with many arms who do not live in round things today move (but not exactly the same).

The second paper looks at how the hard parts of animals with four legs changed when they animals moved onto land. This paper looks at these changes and also looks at how these changes make it so these animals move in different ways. They find that the animals with four legs in the water all have legs that look like we would expect for moving in water. The animals that are on land also have legs that fit the moving we would see for things that need to hold themselves up and move on land. The fun thing is that the animals who come from the animals who are not quite on land and not quite in water yet (the ones in the middle of this change) do not fit into any space where we would expect the animal to be able to move well. This could mean that these animals (which did well enough) were living in a time when it was alright to suck at moving. Also, it may be that some groups of animals that moved onto land from this group that sucks at moving might have had some of the animals in that group that came back to this sucking at moving space.

References:

Dickson, Blake V., et al. "Functional adaptive landscapes predict terrestrial capacity at the origin of limbs." Nature 589.7841 (2021): 242-245.

Cherns, Lesley, et al. "Correlative  tomography of an exceptionally preserved Jurassic ammonite implies  hyponome-propelled swimming." Geology (2021).

Podcast 228 - Clubbed in the Eye

The gang discusses two papers that look at unique morphological features of fossil animals. The first paper looks at a new Ankylosauria species that complicates our understanding of the group’s evolution, and the second paper investigates the structure of the trilobite schizochoral eye. Meanwhile, James endures formatting, Amanda starts her new religion, and Curt finds the puns no one else sees.

Up-Goer Five (Curt Edition):

Our friends talk about two papers where we can see cool parts of animals that are very old and tell us something about how these animals lived in the past. The first paper is looking at a big angry animal with no hair who lived a long time ago and is part of a group that has a long part coming off its bottom with a hurt causing part at the end. There are two close groups of big angry animals that have this long part with a hurt causing part at the end. One group has a lot of points and the other group has a part that is hard. This animal makes it more interesting because it has parts that look like animals with the hard end and animals that have the point end. The animal is still a part of the group with the hard end, but it shows that some of the things we see with the animals with the point end were also found in some animals with the hard end.

The second paper looks at the eyes of an old group of animals who lived in the water and had their hard parts on the outside as well as legs and bodies that are broken into parts. A lot of work had been done on the eyes of some of these animals that have strange eyes where there are less round bits where the eyes can see through than in others, but the round bits are larger. This paper finds some old work and also adds to that work to say that maybe these eyes with large but less round bits might have acted like a whole lot of eyes under each of these round bits. So while most eyes for this group have tiny round bits which act as tiny eyes, this group with the large round bits might have had tiny eye parts under each of the large round bits. These large round bits may have acted as many tiny eyes.

References:

Soto-Acuña, Sergio, et al. "Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile." Nature 600.7888 (2021): 259-263.

Schoenemann, B., et al. "A 390 million-year-old hyper-compound eye in Devonian phacopid trilobites." Scientific reports 11.1 (2021): 1-10.

Podcast 227c - The Priest and the Peddler Part 2

The gang celebrates the end of the year by taking another break to play Fiasco, a crime/noir storytelling game by Bully Pit Games.

What was that you were saying? Oh, no, I am sorry, sir; I do not accept returns. All sales are final!

Well it seems you must not have been using the sacred artifact properly, then! All of my wares are completely authentic. I can assure you of that!

Look, I simply do not have any time to argue with you about this. I am a very busy man and I need to organize a trip north to secure more sacred objects! In fact, I have already arranged my trip. I am leaving Florence tonight…

Oh, fine, I suppose I can help you out. I do happen to have a small sliver of wood from the true cross. I guess I could part with it… for a small price.

“The Priest and the Peddler” is a story of secrets, faith, mistaken identity, and the elusive search for redemption.

Grand Dark Waltz Allegretto by Kevin MacLeod

Link: https://incompetech.filmmusic.io/song/7920-grand-dark-waltz-allegretto

License: https://filmmusic.io/standard-license

Podcast 227b - The Priest and the Peddler Part 1

The gang celebrates the end of the year by taking another break to play Fiasco, a crime/noir storytelling game by Bully Pit Games.

Have you heard about Father Valentine? Strange things happening in that church, I heard. Did you know he recently hired a mercenary? For what? An armed guard? I heard from a friend, who heard from a friend, that the father has some secret plans he doesn’t want us to know about. Anyways, I have a lovely item for sale today that I think would be perfect for you; a finger bone from St. Raphael himself. Keep it close and that cough is sure to go away! Oh of course it will work! Would I lie?

“The Priest and the Peddler” is a story of secrets, faith, mistaken identity, and the elusive search for redemption.

Grand Dark Waltz Allegretto by Kevin MacLeod

Link: https://incompetech.filmmusic.io/song/7920-grand-dark-waltz-allegretto

License: https://filmmusic.io/standard-license

Podcast 227a - Building the 2021 Fiasco

It’s the end of another year, and the Palaeo After Dark team are getting together for another Fiasco. Come join us as James, Amanda, Curt, Ally, and Ants build the characters and the premise for this year’s story of mistaken identity and intrigue in de Medici era Italy.

Podcast 226 - Insert Fleetwood Mac Tusk Joke Here

The gang discusses two papers that look at the evolutionary history of unique teeth. The first paper looks at the history of tusks and tusk-like structures in synapsids, and the second paper looks at the shape of ancient bird teeth. Meanwhile, James gets to the point, Curt is inspired, and Amanda has a drink.

Up-Goer Five (James Edition):

The group looks at two papers that talk about teeth in different groups of animals. The first paper is interested in big teeth that keep growing and don't have a hard cover around them. While these teeth without a hard cover that don't stop growing are usually only found in animals with hair, one group that is part of the same family but much older also has teeth that seem to get big and never stop growing. However it turns out that many of them still have the hard covering, and only some of them lose it to be like the animals with hair today that have long teeth without a cover that doesn't stop growing. The other paper is looking at animals that fly and usually don't have teeth, but that are very old and so do have teeth. They look at the types of these old teeth to see whether they can tell us what these animals ate. It turns out that it is very hard to tell what these animals ate from their teeth, and it seems that other things like the type of face they have may be more important.

References:

Zhou, Ya-Chun, et al. "Evolution of tooth crown shape in Mesozoic birds, and its adaptive significance with respect to diet." Palaeoworld (2021).

Whitney, M. R., et al. "The evolution of the synapsid tusk: insights from dicynodont therapsid tusk histology." Proceedings of the Royal Society B 288.1961 (2021): 20211670.

Podcast 225 - Columbo Meets the Caiman

The gang discusses two papers that look at how trace fossils can give important clues to ancient ecological interactions. The first paper identifies a unique behavior using trace fossils, and the second paper uses bite marks on bone to infer ontogenetic ecological shifts in a large caiman species. Meanwhile, Curt investigates, Amanda collects, and James fixates.

Up-Goer Five (Amanda Edition):

This week our friends talk about animals that roll in wet tiny pieces of rock that are really very tiny tiny. We also talk about a very big very slow animal with hair that got bit by a very large animal with no hair but hard skin and lots of big teeth that has a very long face. The animal with hair that rolled in wet tiny very very tiny pieces of rock shows that these animals did this thing a very long time ago; it shows that these animals with hair and two fingers on each leg were in this place at this time, along with animals with stuff that wasn't hair but made of the same stuff as hair and could fly, too. The second paper looks at how we can talk about a hard part of a very big very slow animal with hair could have gotten grabbed by a small one of a very, very, very big animal with no hair but hard skin and lots of big teeth with a very long face. It tells us that these very big animals with no hair but hard skin and lots of big teeth ate different things when they were small than when they were very, very, very big.

References:

Abbassi, Nasrollah, et al. "Vertebrate  footprints and a mammal mud-bath trace fossil (Laspichnia) from the  Mukdadiya Formation (Late Miocene–Pliocene), Chamchamal Area, Kurdistan  Region, Northeast Iraq." Ichnos 28.1 (2021): 72-83.

Pujos, François, and Rodolfo  Salas-Gismondi. "Predation of the giant Miocene caiman Purussaurus on a  mylodontid ground sloth in the wetlands of proto-Amazonia." Biology Letters 16.8 (2020): 20200239.

Podcast 224 - Second Times the Charm

Random computer glitches are unable to stop the gang from delivering another podcast! This week, they focus on two papers that look at the importance history for understanding trends in our modern biosphere. The first paper discusses how speciation trends are important for planning future conservation efforts, and the second paper looks at the importance of exaptive traits (characters evolved for one purpose but used for another) in the evolutionary history of sea snakes. Meanwhile, Amanda cuts deep, Curt has done this before, and James waits for his time to tell his very good joke.

Up-Goer Five (Curt Edition):

Our friends talk about how the past is important. And this is funny because they already did this before but the big boxes with bits that will shock your hand if you touch them lost the talk they did about the past being important so they are doing it again. The first paper they look at is short. It is about how animals living in places that are high up but in warm places make new types of animals that stay at the same high up place, not higher or lower. This means new animals will more often be living the same types of places as the older animals they came from, and this means that as places change we need to make sure the types of places where these animals live can stay open.

The second paper looks at how long animals without legs moved into the water. There are many groups of animals without legs that moved into water, and this paper wants to know the types of places they were in before they moved into water and also if the things they all have that make it easier to be in water were things that appeared before they moved into water (letting them move in there) or after they moved into water (making it better to be in water). They find that most of these groups started in areas with trees before moving into water. They also find that the things which make it easier to be in water appeared in older groups well before these animals moved into water. This means that the things that made it easy to go in water appeared first, and then this made it so these animals could then move into water.

References:

Linck, Ethan B., et al. "Evolutionary conservatism will limit responses to climate change in the tropics." Biology Letters 17.10 (2021): 20210363.

Gearty, William, Elsie Carrillo, and  Jonathan L. Payne. "Ecological filtering and exaptation in the evolution  of marine snakes." The American Naturalist 198.4 (2021): 506-521.

Podcast 223 - Amanda Loves Watership Down

The gang discusses two papers that look at the impact of ecological interactions on the evolutionary history of groups. The first looks at potential competitive interactions that could control rabbit body size, and the second paper uses the fossil record to investigate potential clade interactions between two groups of bryozoans. Meanwhile, Curt researches in real time, Amanda gets to talk about a childhood favorite, and James makes future plans.

Up-Goer Five (Curt Edition):

Our friends talk about two papers that look at how animals trying to get food and sometimes fighting with each other can change how they live and grow and make more of themselves. The first paper looks at animals that jump and have hair and their name sounds just like hair. These things that sound like hair do not get really big in most cases, even though we know that they could get big if we try and make it happen. This paper looks for reasons why these "hairs" don't get very big. It turns out that "hairs" eat things that a lot of other animals that eat. And while there are a lot of other things in the paper here that help to build this idea, the big idea is that that how big these "hairs" get may be held back by the smallest of the other animals that eat their food. "Hairs" get about as big as the smallest of these other animals in a place.

The second paper looks at animals that grow on top of other things. There are two big groups of these animals, and when we look at how they grow, usually one group will grow over the other group. This means this one group is better at growing in a space and can push out the other group. In the past we used to have more of the group that gets pushed out, but over time we have more of the new group that is better at growing in a place. Some have thought maybe this means that what we see happening in small places may explain this larger change over time. But it is more than just that because it is not just one group going down and another going up. This paper uses a lot of number work to see how these two group may change each other. They find that it is more than just a simple one up one down thing. They find both groups change each other in a few ways. They also don't find that the things happening in the small spaces is causing these bigger changes. It could be because of the type of things we are looking at makes it harder to see these changes, but with what they have it looks like maybe this is not what is causing this change.

References:

Tomiya, Susumu, and Lauren K. Miller. "Why aren't rabbits and hares larger?." Evolution 75.4 (2021): 847-860.

Lidgard, Scott, et al. "When fossil clades ‘compete’: local dominance, global diversification dynamics and causation." Proceedings of the Royal Society B 288.1959 (2021): 20211632.

Podcast 222 - Static Hiss

The gang discusses two papers that look at evolutionary changes in animal groups after the End Cretaceous Mass Extinction. The first paper looks at morphometric changes in shark teeth, and the second paper studies the evolutionary and biogeographic patterns of snakes. Meanwhile, Amanda “fixes” her audio, Curt goes biblical, and James is missing.

Up-Goer Five (Curt Edition):

Our friends talk about things that lived through a real bad time when a huge rock hit the big round place where we all live. The first paper looks at large angry animals that move through water and have pointed things in their mouths and soft bits where things have hard bits. We usually just find the hard pointed bits from the mouth because the rest of the body falls to bits when they die. So this looks at how these old hard bits change from before and after the big rock hit. What they found was that changes happened within groups, where some groups were hit hard and others were not. But if you look at all of the big angry animals, it looks like very little changes. The hard bits are doing things that look the same before and after the rock hit, but its different groups doing that.

The second paper looks at animals with no legs and looked at changes in where they live and how quickly they change over time. The paper finds that after the big rock hit, one group was able to move to a new place. This move seems to happen when they also start making more of themselves. It seems that, for this big group of animals with no legs, the big rock hitting may have helped this group. It seems like a new place opened up after the big rock and the group took over and did well. There are also changes that we see when it gets colder in the time way after the rock hit.

References:

Klein, Catherine G., et al. "Evolution and dispersal of snakes across the Cretaceous-Paleogene mass extinction." Nature Communications 12.1 (2021): 1-9.

Bazzi, Mohamad, et al. "Tooth morphology elucidates shark evolution across the end-Cretaceous mass extinction." PLoS biology 19.8 (2021): e3001108.

Podcast 221 - Ramble On

The gang discusses two papers that look at patterns of speciation and extinction and relate those patterns to shifts in climate. The first paper looks at how both plate tectonics and climatic changes have contributed to shifts in provinciality, and the second paper tests the link between dramatic temperature changes and large scale extinction events. Meanwhile, James cannot remember “that guy”, Curt does not like Oliver Cromwell, Amanda is in an abusive relationship with her cats, and we cannot stay on topic for more than 2 minutes.

Up-Goer Five (Amanda Edition):

Today our friends talk about how the change in hot and cold and places where rocks are over a very long time has changed the way things live. Or not lived. The first paper says that while we used to think that changes in the way the big rocks that stick out of the water that we live on is the most important thing for making different animals and green stuff live in different places. But it turns out that it may be changes in hot and cold that take a very long time to happen that is more important. Both things are important, but how it gets colder the more towards the top of the world you go is just a little more important. It really controls how things can live places. The other paper looks at changes in hot and cold and how that makes things die. It turns out that if it gets warmer faster, or colder faster, it makes things die. They have a real number of 5.2 bits, and it is at more than 10 bits every 1,000,000 years. It does not matter if it gets warmer or colder, it is the quick turn that matters, and the big jump in change. They say that we are already getting hot enough fast enough right now to cause lots of things to die, even if we were not killing them, which we are.

References:

Kocsis, Ádám T., et al. "Increase in  marine provinciality over the last 250 million years governed more by  climate change than plate tectonics." Proceedings of the Royal Society B 288.1957 (2021): 20211342.

Song, Haijun, et al. "Thresholds of temperature change for mass extinctions." Nature communications 12.1 (2021): 1-8.

Podcast 220 - The Bone Gnome

The gang discusses two papers that look at the fossil record of fishes. The first paper looks at the ontogeny of ancient lampreys, and the second paper investigates the impact genome duplication had on the evolutionary history of teleost fishes. Meanwhile, James finds a gnome, Curt has an adorable ghost problem, Amanda appreciates good music, and we are all back on our b#ll$h!t.

Up-Goer Five (Curt Edition):

Our friends talk about two papers that look at animals that live in the water and have hard parts on the inside. The first paper looks at some of these animals which have a round mouth. These animals today are very different as kids then as grown ups. As kids they live in the ground and pull food out of the water. As grown ups they move through the water and eat other animals. This paper looks at old parts of these animals from a long time ago to see if the kids always did this. They find that these very old animals did not have kids and grown ups acting so different. This means that having the kids do something different is a thing that is new, even though people have thought that these animals have always done this.

The second paper looks at the how animals with hard parts that move through the water had the bits inside them that store how to build them get a times two. When there are more bits that store how to build them, it makes the homes in the hard parts bigger. So you can use how big these homes are in the hard parts to learn something about how many bits these animals have. Using old hard parts from old animals and a tree that shows which of the animals are close brothers and sisters to each other, they look at when changes in how big these homes in the hard parts were in the past. And since how big these homes are tells us how many bits that store how to build them they have, we can also see how these bits are changing through time. People have thought that getting more of these bits may be why there are so many of these types of animals. This paper shows that it may not be that simple. The number of bits goes up first, but the number of new animals does not go up at that time. Instead, it happens after big changes in the world. It is possible that these bits may have helped in bringing the number of these animals up, but it alone does not explain it.

References:

Miyashita, Tetsuto, et al. "Non-ammocoete larvae of Palaeozoic stem lampreys." Nature 591.7850 (2021): 408-412.

Davesne, Donald, et al. "Fossilized cell structures identify an ancient origin for the teleost whole-genome duplication." Proceedings of the National Academy of Sciences 118.30 (2021).

Podcast 219 - Brachiopod Vape Bros

The gang discusses two papers that look at examples of cohabitation and unique ecological interactions in the Cambrian. The first paper looks at multiple animals living together in a hemichordate living chamber, the and the second looks at a potential example of parasitism on brachiopods. Meanwhile, James flips a coin, Curt has to live with some consequences, and Amanda ranks things from meh to bad.

Up-Goer Five (Curt Edition):

Our friends talk about two papers that look at animals which are living together, sometimes not because both animals want that. The first paper looks at these long animals with no legs that live together. There are two different types of these long animals living the in the same spot, which is a home that looks like the ones built by the bigger of the two long animals, but the home seems to be a bit too big. Because the small long things do not have bits that could cut off parts of the bigger long thing, they think that these two animals would have lived in the same spot and been just fine. Since the homes are bigger than either animal, it means we still have to figure out why the homes are so big. It could be that the bigger long animals could be kids and the homes were built by the grown ups for the kids to live in.

The second paper looks at these small long round thing that was found on these animals with hard parts on either side which sit on the ground in the water and pull food out of the water. The animals with hard parts could have these small long round things on them or they could not. The animals with hard parts that had these small long round things were smaller than the ones that did not. The way the small long round things were put onto the animals with hard parts makes it look like they are homes for other small animals that would take the food out of the mouth of the animals with hard parts.

References:

Zhang, Zhifei, et al. "An encrusting kleptoparasite-host interaction from the early Cambrian." Nature communications 11.1 (2020): 1-7.

Nanglu, Karma, and Jean-Bernard Caron.  "Symbiosis in the Cambrian: enteropneust tubes from the Burgess Shale  co-inhabited by commensal polychaetes." Proceedings of the Royal Society B 288.1951 (2021): 20210061.

Podcast 218 - FEET!

The gang discusses two papers that look at trackway fossils. The first paper uses a modern study to determine how many tracks are needed to get a reasonable estimate on the trace morphology, and the second paper looks at trackways from an early tetrapod and attempts to determine the likely trace maker. Meanwhile, James has thoughts on Luigi, Amanda gives the birds the bird, Curt regrets a burn, and everyone loves Christopher Walken’s line delivery in Ripper.

Up-Goer Five (Amanda Edition):

Today our friends talk about people walking on ground that is wet and animals with four legs that also had a long back end part. The first paper looks at how many people need to walk on ground that is wet before it is enough people to make the numbers good. It also looks at how different kinds of ground and different types of wet also change the way things look. There actually does not need to be too many people walking on ground that is wet before the numbers are good. That means it is easier to do this with things that are not live anymore. The second paper looks at animals with four legs that were walking around a long time ago. The paper does a good job of figuring out just what those animals with four legs probably were, and about how they walked. They also had a long back end that dragged on the ground. That also tells us about how they walked. But there needs to be more stuff done on these animals with four legs and their walking marks, as well as their legs, before we know exactly what the back end marks mean.

References:

Logghe, A., et al. "Hyloidichnus  trackways with digit and tail drag traces from the Permian of Gonfaron  (Var, France): New insights on the locomotion of captorhinomorph  eureptiles." Palaeogeography, Palaeoclimatology, Palaeoecology 573 (2021): 110436.

Belvedere, Matteo, et al. "When is enough, enough? Questions of sampling in vertebrate ichnology." Palaeontology (2021).