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Evolution of Human Skin Pigmentation
Research on the evolution of skin color in humans was avoided by scientists for many years. Skin color is worthy of scientific investigation, however, because it is the product of over five million years of evolution in the human lineage, it the most obvious characteristic in which people vary in their appearance, and it is of great social importance. My research on the evolution of human skin and skin color, done mostly in collaboration with George Chaplin, has demonstrated that skin color is the product of natural selection acting to regulate levels of melanin pigment in the skin relative to levels of ultraviolet radiation (UVR) in the environment. Melanin is a natural sunscreen that prevents the breakdown of certain essential biomolecules (in particular, the B vitamin folate, and DNA), while permitting enough UVR to enter the skin to promote the production of essential vitamin D.
Jablonski, N. G., & Chaplin, G. (2017). The colours of humanity: The evolution of pigmentation in the human lineage. Philosophical Transactions of the Royal Society B: Biological Sciences, 372(1724).
Coussens, A. K., Naude, C. E., Goliath, R., Chaplin, G., Wilkinson, R. J., & Jablonski, N. G. (2015). High-dose vitamin D3 reduces deficiency caused by low UVB exposure and limits HIV-1 replication in urban Southern Africans. Proceedings of the National Academy of Sciences, 112(26), 8052-8057.
Jablonski, N. G., and Chaplin, G. (2013). Epidermal pigmentation in the human lineage is an adaptation to ultraviolet radiation. Journal of Human Evolution, 65(5), 671-675.
Swiatoniowski, A. K., Quillen, E., Shriver, M. D., and Jablonski, N. G. (2013). Comparing von Luschan skin color tiles and modern spectrophotometry for measuring human skin pigmentation. American Journal of Physical Anthropology, 151(2), 325-330.
Jablonski, N. G., and Chaplin, G. (2012). Human skin pigmentation, migration and disease susceptibility. Philosophical Transactions of the Royal Society B: Biological Sciences, 367(1590), 785-792.
Jablonski, N. G. (2012). The evolution of human skin colouration and its relevance to health in the modern world. Journal of the Royal College of Physicians of Edinburgh, 42(1), 58-63.
Jablonski, N. G., & Chaplin, G. (2010). Human skin pigmentation as an adaptation to UV radiation. Proceedings of the National Academy of Sciences, 107(S2), 8962-8968.
Jablonski, N. G. (2010). Skin coloration. In M. I. Muehlenbein (Ed.), Human Evolutionary Biology (pp. 192-213). Cambridge: Cambridge University Press.
Chaplin, G., & Jablonski, N. G. (2009). Vitamin D and the evolution of human depigmentation. American Journal of Physical Anthropology, 139(4), 451-461.
Evolution of Old World Monkeys
The Old World monkeys (Superfamily Cercopithecoidea) comprise one of the most geographically widespread and diverse lineages of primates that has ever existed. Although their evolutionary history dates back to the early Miocene, evidence of Old World monkeys becomes common in the fossil record only in the latest Miocene and Pliocene. The fossil record of the group in Africa is particularly rich and well-dated. My research has concentrated on illumination of the evolutionary history of the Theropithecus lineage. My research on the evolution of the snub-nosed monkeys of East Asia has led me to have a strong interest in the evolution of the colobine monkeys, especially in the significance of ruminant digestion in that group.
Cerling, T. E., Chritz, K. L., Jablonski, N. G., Leakey, M. G., and Manthi, F. K. (2013). Diet of Theropithecus from 4 to 1 Ma in Kenya. Proceedings of the National Academy of Sciences, 110(26), 10507-10512.
Ji, X., Jablonski, N. G., et al. (2013). Juvenile hominoid cranium from the terminal Miocene of Yunnan, China. Chinese Science Bulletin, 58(31), 3771-3779.
Liedigk, R., Yang, M., Jablonski, N. G., et.al. (2012). Evolutionary history of the odd-nosed monkeys and the phylogenetic position of the newly described Myanmar snub-nosed monkey Rhinopithecus strykeri. PloS one, 7(5), e37418.
Jablonski, N. G., & Frost, S. (2010). Cercopithecoidea. In L. Werdelin & W. J. Sanders (Eds.), Cenozoic Mammals of Africa (pp. 393-428). Berkeley, CA: University of California.
Jablonski, N. G., & Chaplin, G. (2009). The fossil record of gibbons. In S. Lappan & D. J. Whittaker (Eds.), The Gibbons: New Perspectives on Small Ape Socioecology and Population Biology (pp. 111-130). New York: Springer.
Jablonski, N. G. (2003). The evolution of the tarsiid niche. In P. C. Wright, E. L. Simons & S. Gursky (Eds.), Tarsiers: Past, Present, and Future (pp. 35-49). New Brunswick: Rutgers University Press.
Jablonski, N. G., Leakey, M. G., Kiarie, C., & Anton, M. (2002). A new skeleton of Theropithecus brumpti (Primates: Cercopithecidae) from Lomekwi, West Turkana, Kenya. Journal of Human Evolution, 43(6), 887-923.
Jablonski, N. G. (2002). Fossil Old World monkeys: The late Neogene radiation. In W. C. Hartwig (Ed.), The Primate Fossil Record (pp. 255-299). Cambridge, UK: Cambridge University Press.
Jablonski, N. G., Whitfort, M. J., Roberts-Smith, N., & Xu, Q. (2000). The influence of life history and diet on the distribution of catarrhine primates during the Pleistocene in eastern Asia. Journal of Human Evolution, 39(2), 131-157.
Jablonski, N. G. (1995). The phyletic position and systematics of the douc langurs of Southeast Asia. American Journal of Primatology, 35(3), 185-205.
Evolution of Primate Thermoregulation
The evolution of habitual bipedal posture and locomotion is considered the key innovation which distinguishes the human lineage. Despite its importance, our knowledge of the processes leading to the emergence of habitual bipedalism remains unclear, largely because the behaviors that provided the impetus for this momentous change were not preserved in the fossil record. My research on the evolution of human bipedalism and its ramifications has been done mostly in collaboration with George Chaplin. The premise of our research has been that the behaviors leading to the regular adoption of bipedal postures in hominins must have conferred considerable reproductive success to individuals engaging in those behaviors. Behaviors that were common (e.g., feeding, resting, sleeping) are not necessarily important in terms of their impact on reproductive success. For this reason, our research has emphasized the importance of bipedal displays and appeasement postures in the evolution of habitual bipedalism in human ancestors. These behaviors are important, especially in our closest African ape relatives, in determining the outcomes of agonistic encounters and of disputes over mating access in females.
Chaplin, G., Jablonski, N. G., Sussman, R. W., and Kelley, E. A. (2014). The role of piloerection in primate thermoregulation. Folia Primatologica, 85(1), 1-17.
Jablonski, N. G., & Chaplin, G. (2004). Becoming bipedal: How do theories of bipedalization stand up to anatomical scrutiny? In F. C. Anapol, R. Z. German & N. G. Jablonski (Eds.), Shaping Primate Evolution: Form, Function and Behavior (pp. 281-296). Cambridge, UK: Cambridge University Press.
Jablonski, N. G., & Chaplin, G. (1993). Origin of habitual terrestrial bipedalism in the ancestor of the Hominidae. Journal of Human Evolution, 24(4), 259-280.
Development of a Genetics and Genealogy Curriculum