Sun, 28 February 2021
The gang discusses two papers that look at evidence for past behavior in the fossil record using both fossil and modern data. The first looks at the evolution of vibration sensing organs in bird beaks, and the second paper looks at how shark teeth within the genus Otodus changed through time. Meanwhile, the gang spends the first 11 minutes arguing about bagels.
Up-Goer Five (James Edition):
The group look at two papers that look at how different types of face have come about in different groups in order to do or eat different things. The first paper looks at the hard face of animals that fly, especially some that have lots of little spaces inside the hard face that allow them to feel things without touching them. The paper shows that the flying animals that can feel things without touching them are not close family, but that when they do begin to feel things without touching them they end up doing it the same way every time. Also some of the earliest things that could fly could feel things without touching them, so all the different ones that feel things without feeling them may be able to do it because it is something that deep down they have because their oldest family did. The other paper looks at big angry animals that breathe water that are more big and angry. It looks at the teeth to see if as these animals got bigger their teeth changed so that they could eat bigger food. The study actually shows that the teeth did not get better at eating big food, but that the way the teeth change might be because they are growing for longer as the animal gets bigger, and that this same thing might explain why those around today eat such a wide type of foods.
du Toit, C. J., A. Chinsamy, and S. J. Cunningham. "Cretaceous origins of the vibrotactile bill-tip organ in birds." Proceedings of the Royal Society B 287.1940 (2020): 20202322.
Ballell, Antonio, and Humberto G. Ferrón. "Biomechanical insights into the dentition of megatooth sharks (Lamniformes: Otodontidae)." Scientific reports 11.1 (2021): 1-9.
Sun, 14 February 2021
The gang discusses two papers that look at how competition, environment, and biogeography affect macroevolutionary patterns. The first paper looks at the evolution of bird beaks, and the second paper looks at patterns in horse evolution. Meanwhile, James has “some” gin, Amanda practices her “reviewer” skills, and Curt enjoys some last minute “honesty”.
Up-Goer Five (James Edition):
Today the group look at two papers that are interested in what causes animals to change their form over time. The first paper looks at animals with hard noses that fly to see what causes the nose to change, especially whether close friends wanting to eat the same food makes them change. The paper studies many different groups of animals with hard noses that fly and found that while some groups do show some sign of changing because close friends want to eat the same food, it is not all parts of the animal that changes and most groups do not show any sign of changing because of it at all. The second paper looks at scared animals that run on one finger to see what caused their legs to change over time. It shows that the scared animals that run on one finger living on different big bits of land had different legs, and that their legs changed when they moved into new places so that they could walk across the different types of land they found.
MacLaren, Jamie A. "Biogeography a key influence on distal forelimb variation in horses through the Cenozoic." Proceedings of the Royal Society B 288.1942 (2021): 20202465.
Chira, A. M., et al. "The signature of competition in ecomorphological traits across the avian radiation." Proceedings of the Royal Society B 287.1938 (2020): 20201585.