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Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Go to http://Raceforretirement.com and see how the action gap affects you. Follow all of our Peru adventures on this playlist: http://bit.ly/SmartPeru ↓ More info and sources below ↓ Special thanks to Rainforest Expeditions for hosting us! Visit http://www.perunature.com/ References: Wilson, E.O. "The Diversity of Life" http://eowilsonfoundation.org/the-diversity-of-life/ Eichhorn, Markus P. "Latitudinal gradients." Natural Systems: The organisation of life: 249-264. "Tropical Ecology" (textbook) by John Kircher (2011) http://press.princeton.edu/titles/9486.html Condamine, Fabien L., et al. "What causes latitudinal gradients in species diversity? Evolutionary processes and ecological constraints on swallowtail biodiversity." Ecology letters 15.3 (2012): 267-277. Jenkins, Clinton N., Stuart L. Pimm, and Lucas N. Joppa. "Global patterns of terrestrial vertebrate diversity and conservation." Proceedings of the National Academy of Sciences 110.28 (2013): E2602-E2610. Mannion, Philip D., et al. "The latitudinal biodiversity gradient through deep time." Trends in ecology & evolution 29.1 (2014): 42-50. Mittelbach, Gary G., et al. "Evolution and the latitudinal diversity gradient: speciation, extinction and biogeography." Ecology letters 10.4 (2007): 315-331. Wiens, John J., et al. "Evolutionary and ecological causes of the latitudinal diversity gradient in hylid frogs: treefrog trees unearth the roots of high tropical diversity." The American Naturalist 168.5 (2006): 579-596. ---------------- It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.D. Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below! Facebook: http://www.facebook.com/itsokaytobesmart Twitter: http://twitter.com/okaytobesmart http://twitter.com/jtotheizzoe Tumblr: http://www.itsokaytobesmart.com Instagram: http://instagram.com/jtotheizzoe Snapchat: YoDrJoe Produced by PBS Digital Studios Music via APM Stock images from SciencePhoto http://www.sciencephoto.com/ and Shutterstock http://www.shutterstock.com

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