When Diversity of Life on Earth Tripled! GEO GIRL

The Great Ordovician Biodiversification Event marked the first drastic and lasting increase in biodiversification of multicellular life on Earth! The Cambrian Explosion replaced the ediacaran fauna with Cambrian fauna and the Great Ordovician Biodiversification Event led to the replacement of Cambrian fauna with the more diverse Paleozoic fauna, which have since been largely replaced by Mesozoic-Cenozoic/Modern fauna. This event occurred in different places at different times, and thus, there were many causes. The main causes for this diverisifcation include: dispersed continents, active tectonics, orogenies, and volcanism, warmth and high CO2 levels, gradual cooling throughout the Ordovician period, planktonic diversification and increase in abundance, animal diversification itself, especially increased predator-prey relationships, and potentially even a meteor shower! There were also many impacts of this ordovician diversifiation, including more complex food webs and ecosystems with more specialied and tiered species, more multicellular reefs rather than the micrbrially dominated reefs of the precambrian, and more! I hope you enjoy learning about this event with me ;D

References:
Alroy et al., 2008 (Phanerozoic trends in the global diversity of marine invertebrates): https://doi.org/10.1126/science.1156963
Bambach, 1993 (Seafood through time: changes in biomass, energetics, and productivity in the marine ecosystem): http://dx.doi.org/10.1666/13065
Harper et al., 2015 (The Great Ordovician Biodiversification Event: Reviewing two decades of research on diversity's big bang illustrated by mainly brachiopod data): https://doi.org/10.1016/j.palwor.2015...
Servais et al., 2008 (The Ordovician biodiversification: revolution in the oceanic trophic chain): https://doi.org/10.1111/j.1502-3931.2...
Holland, 2012 (The Ordovician radiation: a follow-up to the Cambrian explosion?): https://doi.org/10.1093/icb/43.1.178
Servais & Harper, 2018 (The Great Ordovician Biodiversification Event (GOBE): definition, concept and duration): https://doi.org/10.1111/let.12259
Edwards et al., 2017 (Oxygenation as a driver of the Great Ordovician Biodiversification Event): https://doi.org/10.1038/s41561-017-00...
Stigall et al., 2019 (Coordinated biotic and abiotic change during the Great Ordovician Biodiversification Event: Darriwilian assembly of early Paleozoic building blocks): https://doi.org/10.1016/j.palaeo.2019...

0:00 What is the GOBE?
1:27 Leading up to the GOBE
3:06 Evolutionary Fauna Transitions
3:36 Ediacaran Fauna
4:38 Cambrian Fauna
6:11 Paleozoic Fauna
7:48 Multiple Causes of the GOBE
8:23 Warm, Nutrient-rich Conditions
10:40 Tectonics & Mountain Building
11:40 Gradual Cooling
14:46 ‘Food’ & O2 Rise
15:54 Meteor Shower
16:52 Diversification Itself
17:42 Impacts of GOBE
19:13 More Stable & Resilient Ecosystems
19:55 Reef Transition & New Food Chains
20:42 Summary

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Non-textbook books I recommend:
Oxygen by D. Canfield: https://amzn.to/3gffbCL
Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I
Life on young planet by A. Knoll: https://amzn.to/2RBMpny
Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2
Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb
Oxygen by N. Lane: https://amzn.to/3z4FgwZ
Alien Oceans by K. Hand: https://amzn.to/3clMx1l
Life's Engines: https://amzn.to/3w1Nhke

Tools I use as a geologist/teacher/student:
Geology field notebook: https://amzn.to/3lb6dJf
Geology rock hammer: https://amzn.to/3DZw8MA
Geological compass: https://amzn.to/3hfbdLu
Geological hand lens: https://amzn.to/3jXysM5
Camera: https://amzn.to/3l6fGRT
Carbon-neutral pencil bag: https://shrsl.com/3cvjv
Carbon-neutral backpack: https://shrsl.com/3cvkc

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