2022:

Chiou KL, Janiak MC, Schneider-Crease I, Sen S, Ayele Ferehiwot, Chuma IS, Knauf S, Lemma A, Signore AV, D’Ippolito AM, Abebe B, Haile AA, Kebede F, Fashing PJ, Nguyen N, McCann C, Houck ML, Wall JD, Burrell AS, Bergey CM, Rogers J, Phillips-Conroy JE, Jolly CJ, Melin AD, Storz JF, Lu A, Beehner JC, Bergman TJ, Snyder-Mackler N (2022). “High-altitude adaptation and incipient speciation in geladas.” Nature Ecology and Evolution. doi: 10.1038/s41559-022-01703-4

Sloan E, Beehner JC, Bergman TJ, Lu A, Snyder-Mackler N, Jacquemyn H (2022) “Effects of climate variability on the demography of wild geladas.” Ecology and Evolution.

Feder J, Beehner JC, Baniel A, Bergman TJ,  Snyder-Mackler N, Lu A (2022) “Social drivers of maturation age in female geladas.” Behavioral Ecology.

DeLacey PM, Perlman RF, Sen S, Schneider-Crease I, Chiou KL, Lemma A, Ayele F, Higham JP, Lu A, Snyder-Mackler N, Beehner JC, Bergman TJ (2022). “Assessing male gelada chest patches: color measurement and physiological mechanisms.” Mammalian Biology, doi: 10.1007/s42991-021-00211-5.

2021:

Tinsley Johnson E, Feder JA, Bergman TJ, Lu A, Snyder-Mackler N*, Beehner JC* (2021). “The Goldilocks Effect: Female geladas in mid-sized groups have higher fitness.” Proceedings of the Royal Society B, doi: 10.1098/rspb.2021.0820.

Zipple MN, Roberts EK, Alberts SC, Beehner JC. (2021) The Bruce effect should be defined by function, not mechanism: comments on ‘How to escape male infanticide: mechanisms for avoiding or terminating pregnancy in mammals’. Mammal Review. doi: 10.1111/mam.12250

Baniel A, Amato KR, Beehner JC, Bergman TJ, Mercer A, Perlman RF, Petrullo L, Reitsema L, Sams S, Lu A*, Snyder-Mackler N* (2021). “Seasonal shifts in the gut microbiome indicate plastic responses to diet in wild geladas.” Microbiome  9:26. doi: 10.1186/s40168-020-00977-9

Palagi E, Bergman TJ (2021). “Bridging captive and wild studies: Behavioral plasticity and social complexity in Theropithecus gelada“. Animals. 2021 Oct 11(10):3003. doi: 10.3390/ani11103003

Lu A, Feder JA, Snyder-Mackler N, Bergman TJ, Beehner JC (2021). “Male-mediated maturation in a wild primate.” Current Biology. doi: 10.1016/j.cub.2020.10.003 

2020:

Trede F, Lemkul A, Atickem A, Beehner JC, Bergman TJ, Burke R, Fashing PJ, Knauf S, Mekonnen A, Moges A, Nguyen N, Roos C, Zinner D (2020) Geographic distribution of microsatellite alleles in geladas (Primates, Cercopithecidae): Evidence for three evolutionary units. Zoologica Scripta. 49:659-667. doi: 10.1111/zsc.12451

Schneider-Crease I, Beehner JC,  Bergman T, Gomery M, Koklic L, Lu A, Snyder-Mackler N (2020). “Ecology eclipses phylogeny as a major driver of nematode parasite community structure in an herbivorous primate.” Functional Ecology, doi: 10.1111/1365-2435.13603.

Carrera SC, Sen S, Heistermann M, Lu A, Beehner JC. (2020). Low rank and primiparity increase fecal glucocorticoid metabolites across gestation in wild geladas. General and Comparative Endocrinology. doi: 10.1016/j.ygcen.2020.113494

Schneider-Crease I, Chiou KL, Snyder-Mackler N, Bergman TJ, Beehner JC, Lu A (2019). “Beyond infant death: the hidden costs of male immigration in geladas.” Animal Behaviour, doi:  doi:10.1016/j.anbehav.2019.11.010.

Lazow, SP, Bergman, TJ. (2020). “The structural and motivational role of the unique lip-flip movement in the gelada (Theropithecus gelada) facial display repertoire.” American Journal of Physical
Anthropology 1– 11. doi: 10.1002/ajpa.24031

We had to evacuate the gelada research station in March 2020 due to the Coronavirus. Listen to Dr. Jacinta Beehner explain the logistics of this process on NPR’s The Pulse – Science Interrupted: The Impact of the Coronavirus. Listen to the interview here.

Join Duke University’s Long-Term Research in Animal Behavior Series where Dr. Jacinta Beehner presents 15 years of research on how males can change female gelada reproduction. Video of talk here.

These monkeys have a ‘puberty switch’ they flip when the right male comes along. Listen to the interview here.

Interview with Dr. Jacinta Beehner, our guest on LunchBreak Science with the Leakey Foundation to learn all about the battle between the sexes in wild geladas. Video of the interview here.

2019:
Fischer J, Higham JP, Alberts SC, Barrett L, Beehner JC, Bergman TJ. Carter A, Collins A, Elton S, Fagot J, Ferreira da Silva M, Hammerschmidt K, Henzi P, Jolly CJ, Knauf S, Kopp G, Rogers J, Roos C, Ross C, Seyfarth RM, Silk J, Snyder-Mackler N, Städele V, Swedell L, Wilson ML, Zinner D. (2019) Insights into the evolution of social systems and species from baboon studies. eLife; 8: e50989. doi: 10.7554/eLife.50989

Zipple MN, Roberts EK, Alberts SC, Beehner JC (2019) Male-mediated prenatal loss: Functions and mechanisms. Evolutionary Anthropology. 28(3):114-125. doi: 10.1002/evan.21776.

Lu A, Petrullo L, Carerra S, Feder J, Schneider-Crease I, Snyder-Mackler N (2019). “Developmental Responses to Early-Life Adversity: Evolutionary and Mechanistic Perspectives.” Evolutionary Anthropology, doi: doi:10.1002/evan.21791

Bergman TJ, Beehner JC, Painter MC, Gustison ML*. (2019) The speech-like properties of non-human primate vocalizations. Animal Behaviour. 151:229-237 doi: 10.1016/j.anbehav.2019.02.015

Gustison ML, Tinsley Johnson E, Beehner JC, Bergman TJ. (2019) The social functions of complex vocal sequences in wild geladas. Behavioral Ecology and Sociobiology. 73:14. doi: 10.1007/s00265-018-
2612-5.

2018:
Gustison ML, Tinsley Johnson E, Beehner JC, Bergman TJ. (2018) The social functions of complex vocal sequences in wild geladas. (2018). Behavioral Ecology and Sociobiology. 73:14. doi: 10.1007/s00265-018-2612-5

Bergman TJ, Haile AA, Beehner JC, (2018). What is (not) a baboon?. International Journal of Primatology. 39(6): 1005-1008. doi: 10.1007/s10764-018-0063-5

Zinner D, Dolotovskaya S, Urbanek KA, Gippoliti S, Burke R, Moges A, Atickem A, Mekonnen A, Beehner JC, Bergman TJ, Fashing P, Roos C. (2018) Phylogeography, mitochondrial DNA diversity, and demographic history of geladas (Theropithecus gelada). PloS one. 23;13(8):e0202303.

Ramos-Fernandez G, King AJ, Beehner JC, Bergman TJ, Crofoot MC, Di Fiore A, Lehmann J, Schaffner CM, Snyder-Mackler N, Zuberbühler K, Aureli F, Boye D (2018). Quantifying uncertainty due to fission–fusion dynamics as a component of social complexity. Proceedings of the Royal Society B: Biological Sciences. 285; doi: 10.1098/rspb.2018.0532

Jarvey JC, Low BS, Pappano DJ, Bergman TJ, Beehner JC (2018). Graminivory and Fallback Foods: Annual Diet Profile of Geladas (Theropithecus gelada) Living in the Simien Mountains National Park, Ethiopia. International Journal of Primatology, 39(105). doi: 10.1007/s10764-018-0018-x. github

Tinsley Johnson E, Snyder-Mackler N, Lu A, Bergman TJ, Beehner JC (2018). Social and ecological drivers of reproductive seasonality in geladas. Behavioral Ecology. 29(3):574-588. doi: 10.1093/beheco/ary008. github.

2017:
Schneider-Crease I, Griffin RH, Gomery MA, Bergman TJ, Beehner JC (2017). High mortality associated with tapeworm parasitism in geladas (Theropithecus gelada) in the Simien Mountains National Park, Ethiopia. American Journal of Primatology, 79(9). doi: 10.1002/ajp.22684

Schneider-Crease I, Griffin RH, Gomery MA, Dorny P, Noh JC, Handali S, Chastain HM, Wilkins PP, Nunn CL, Snyder-Mackler N, Beehner JC, Bergman TJ (2017). Identifying wildlife reservoirs of neglected taeniid tapeworms: Non-invasive diagnosis of endemic Taenia serialis infection in a wild primate population. PLoS Neglected Tropical Diseases, 11(7): e0005709. doi: 10.1371/journal.pntd.0005709.

Beehner JC, Bergman TJ (2017). The next step for stress research in primates: To identify relationships between glucocorticoid secretion and fitness. Hormones and Behavior, 91. doi: 10.1016/j.yhbeh.2017.03.003

Gustison ML, Bergman TJ (2017). Divergent acoustic properties of gelada and baboon vocalizations and their implications for the evolution of human speech. Journal of Language Evolution, 2(1): 20-36. doi: 10.1093/jole/lzx015

Roberts EK, Lu A, Bergman TJ, Beehner JC (2017). Female Reproductive Parameters in Wild Geladas (Theropithecus gelada). International Journal of Primatology, 38: 1. doi: 10.1007/s10764-016-9939-4

Benítez ME., Pappano DJ, Bergman TJ, Beehner JC (2017). Evidence for mutual assessment in a wild primate. Scientific Reports, 7(1): 2952. doi: 10.1038/s41598-017-02903-w

2016:
Lu A, Bergman TJ, McCann C, Stinespring-Harris A, Beehner JC (2016). Growth trajectories in wild geladas (Theropithecus gelada). American Journal of Primatology, 78: 707–719. doi: 10.1002/ajp.22535

Snyder-Mackler N, Pappano DJ (2016). Gelada (Theropithecus). In The International Encyclopedia of Primatology.  John Wiley & Sons, doi: 10.1002/9781119179313.wbprim0252

Benitez ME, le Roux A, Fischer J, Beehner JC, Bergman TJ (2016) Acoustic and temporal variation in gelada loud calls advertise male quality. International Journal of Primatology, 37(4-5). doi: 10.1007/s10764-016-9922-0

Gustison, ML, S Semple, R Ferrer-i-Cancho, & TJ Bergman (2016). Gelada vocal sequences follow Menzerath’s linguistic law. Proceedings of the National Academy of Sciences, E2750–E2758. doi: 10.1073/pnas.1522072113

Gustison ML, Bergman TJ. (2016) Vocal complexity influences female responses to gelada male calls. Scientific Reports. 6:19680. doi: 10.1038/srep19680.

Sheehan MJ, Bergman TJ. (2016) Is there an evolutionary trade-off between quality signaling and social recognition? Behavioral Ecology. doi: 10.1093/beheco/arv109.

2015:
Beehner JC, Gesquiere L, Cheney DL, Seyfarth RM, Altmann J (2015) Corrigendum to Testosterone related to age and life-history stages in male baboons and geladas. Hormones and Behavior. doi: 10.1016/j.yhbeh.205.08.004.

Barale CL, Rubenstein DI, Beehner JC (2015) Juvenile social relationships reflect adult patterns of behavior in wild geladas. American Journal of Primatology. 77: 1086-1096. doi: 10.1002/ajp.22443

Bergman TJ, Beehner JC. (2015) Measuring social complexity. Animal Behaviour. 103:203-209. doi: 10.1016/j.anbehav.2015.02.018

2014:
Pappano DJ, Beehner JC. (2014) Harem-holding males do not rise to the challenge: androgens respond to social but not to seasonal challenges in wild geladas. Royal Society Open Science 1: 140081. doi: 10.1098/rsos.140081

Tinsley Johnson E*, Snyder-Mackler N*, Beehner JC & Bergman TJ. (2014) Tinsley Johnson et al (2013). Kinship and dominance in female geladas. International Journal of Primatology, 35:1, 288-304, doi: 10.1007/s10764-013-9733-5

Snyder-Mackler N, Alberts SC, Bergman TJ. (2014) The socio-genetics of a complex society: female gelada relatedness patterns mirror association patterns in a multilevel society. Molecular Ecology. doi: 10.1111/mec.12987, data: 10.5061/dryad.d8p5g

2013:
Scheider-Crease I*, Snyder-Mackler N*, Jarvey JC & Bergman TJ. (2013) Molecular identification of Taenia serialis coenurosis in a wild Ethiopian gelada (Theropithecus gelada). Veterinary Parasitology. 198:1-2, 240-243, doi: 10.1016/j.vetpar.2013.08.015.

Bergman TJ. (2013) Speech-like vocalized lip-smacking in geladas. Current Biology 23(7):R268-R269. doi: 10.1016/j.cub.2013.02.038

le Roux A, Snyder-Mackler N, Roberts E, Beehner JC, Bergman TJ. (2013) Evidence for tactical concealment in a wild primate. Nature Communications. doi: 1038/ncomms2468.

Bergman TJ, Sheehan MJ. (2013) Social knowledge and signals in primates. American Journal of Primatology. doi: 10.1002/ajp.22103

Beehner JC, Lu A (2013) Reproductive suppression in female primates – A review. Evolutionary Anthropology. 22:226-238. doi: 10.1002/evan.21369

2012:
Snyder-Mackler N, Alberts SC, Bergman TJ. (2012) Concessions of an alpha male? Cooperative defence and shared reproduction in multi-male primate groups. Proc. R. Soc. B. 22(1743): 3788-3795. doi: 10.1098/rspb.2012.0842

Pappano DJ*, Snyder-Mackler N*, Bergman TJ, Beehner JC. (2012) Social ‘predators’ within a multilevel primate society. Animal Behaviour. 84: 653-658. doi: 10.1016/j.anbehav.2012.06.021

Roberts EK, Lu A, Bergman TJ, Beehner JC. (2012) A Bruce effect in wild geladas. Science. 35 (6073): 1222-1225. doi: 10.1126/science.1213600

Gustison ML, le Roux A, Bergman TJ. (2012) Derived vocalizations of geladas (Theropithecus gelada) and the evolution of vocal complexity in primates. Phil. Trans. R. Soc. B. 367 (1597): 1847-1859. doi: 10.1098/rstb.2011.0218

Snyder-Mackler N, Beehner JC, Bergman TJ. (2012) Defining higher levels in the multilevel societies of geladas (Theropithecus gelada). International Journal of Primatology. 33: 1054-1068. doi: 10.1007/s10764-012-9584-5

le Roux A, Bergman TJ. (2012) Indirect rival assessment in a social primate, Theropithecus gelada. Animal Behaviour. 83: 249-255.

Bergman TJ, Beehner JC. (2012) Theropithecus gelada. In J Kingdon, D Happold, T Butynski (eds.): The Mammals of Africa. Volume II. Primates. Bloomsbury Press: London. pp. 240-244.

2011:
le Roux A, Beehner JC, Bergman TJ. (2011) Female philopatry and dominance patterns in wild geladas. American Journal of Primatology. 73:422-430.

Mau M, Beehner JC, Johann A. (2011) Nutritional aspects of Theropithecus gelada: From the wild to captive breeding. In SR Borgearo (ed.): Animal Feed: Types, Nutrition, and Safety. Nova Science Publishers, Inc. pp. 195-206.

2010:
Bergman TJ. (2010) Experimental evidence for limited vocal recognition in a wild primate: implications for the social complexity hypothesis. Proc. R. Soc. B. 277(1696): 3045-3053.

Pappano DJ, Roberts EK, Beehner JC. (2010) Testing extraction and storage parameters for a fecal hormone method. American Journal of Primatology 72:934-941.

2009:
Beehner JC, Gesquiere L, Seyfarth RM, Cheney DL, Alberts SC, Altmann J. (2009) Testosterone related to age and life-history stages in male baboons and geladas. Hormones and Behavior 56(4):472-480.

Bergman T, Ho L, Beehner J. (2009) Chest color and social status in male geladas (Theropithecus gelada). International Journal of Primatology 30(6):791-806.

Bergman TJ, Kitchen DM. (2009) Comparing responses to novel objects in wild baboons (Papio ursinus) and geladas (Theropithecus gelada). Animal Cognition 12(1):63-73.

2008:

Beehner JC, McCann C. (2008) Seasonal and altitudinal effects on glucocorticoid metabolites in a wild primate (Theropithecus gelada). Physiology & Behavior 95(3):508-514.

Beehner JC, Bergman TJ. (2008) Infant mortality following male takeovers in wild geladas. American Journal of Primatology 70(12):1152-1159.

Bergman TJ, Beehner JC. (2008) A simple method for measuring colour in wild animals: validation and use on chest patch colour in geladas (Theropithecus gelada). Biological Journal of the Linnean Society 94(2):231-240.

2007:
Beehner JC, Berhanu G, Bergman TJ, McCann C. (2007) Population estimate for geladas (Theropithecus gelada) living in and around the Simien Mountains National Park, Ethiopia. Ethiopian Journal of Science 30(2):149-154.

* denotes equal contribution