Loren Buck

C. Loren Buck

Professor of Biological Sciences, Ph.D.
Office: CBISB 101R
Phone: 907.786.1367
Email: clbuck@uaa.alaksa.edu


  • 1992, B.S. Biology. Montana State University, Billings
  • 1992, B.S. Education. Montana State University, Billings
  • 1998, Ph.D. Biology. University of Alaska Fairbanks
    • Thesis Title: Physiological Ecology of the Arctic Ground Squirrel: Energy Metabolism, Torpor, and Behavioral Endocrinology.  

Teaching Responsibilities

Fall 2014:

BIOL A490 Behavioral Endocrinology

Spring 2015:

Biological Rhythms 

Research Interests

I am an environmental physiologist interested in adaptations of animals to extreme and/or variable environments. Model organisms utilized for these investigations are broad and have included mammals, birds, fish and crabs. Research projects typically include both field and laboratory investigations of organismal and sub-organismal physiology.



Live Science, Dr. Loren Buck

Current Funded Research Projects

  • 2011. NIH-R01, Collaborative Research, Miller, PK, von Hippel, FA, Carpenter, DO and CL Buck. Protecting the Health of Future Generations: Assessing and Preventing Exposures to Endocrine-Disrupting Chemicals in Two Alaska Native Arctic Communities on St. Lawrence Island.
  • 2010. NIH- R01, Mechanisms of perchlorate-induced disruption of sexual development. Collaborative research, F. von Hippel, CL Buck, T, W Cresko, J Postlethwait.
  • 2012. GreatLand Trust. von Hippel, F.A. & Buck, C.L. Stickleback biomarkers of aquatic pollution in Ship Creek, Alaska.
  • 2012. NSF IOS, CL Buck and CT Williams & BM Barnes. Collaborative research: Persistence, entrainment, and function of circadian rhythms in arctic ground squirrels.
  • 2012. NIH R-15, Duddleston, KN and CL Buck. Interrelationships between host physiology and the gut microbial community: discoveries in an extreme phenotype. 

Selected Publications 


1. Furin CG, von Hippel FA, Cresko WA, Buck CL, Postlethwait J and O'Hara TM. (in review) Timing of perchlorate exposure during development differentially alters threespine stickleback dermal bone. General and Comparative Endocrinology. 
2. Furin CG, von Hippel FA, Cresko WA, Buck CL, Postlethwait J and O'Hara TM. (in review) Critical developmental windows for histomorphologic changes of fish thyroid and gonad tissues due to sodium perchlorate exposure. General and Comparative Endocrinology. 
3. Ashley, NT, Ubuka, T, Schwabl, I, Goymann, W, Salli, BM, Bentley, GE, & Buck, CL, (in review) Re-creating the Midnight Sun: Effect of constant light upon Per2 clock gene expression, melatonin concentration, and locomotor activity in captive arctic-breeding songbirds, Lapland longspurs (Calcarius lapponicus). Journal of Biological Rhythms. 
4. Stevenson, TJ, Duddleston, KN and CL Buck (2014) Diversity, density and activity of the arctic ground squirrel cecal microbiota: effects of season and host physiological state. Applied Environmental Microbiology. 
5. Petersen, AM, Dillon, D, Bernhardt, RA, Torunsky, R, Postlethwait, J, von Hippel, FA, Buck, CL and W Cresko (in review) Perchlorate disrupts reproductive development in threespine stickleback without changing whole-body levels of thyroid hormone. General and Comparative Endocrinology. 
6. Williams, CT, Wilsterman, K, Kelley, AD, Breton, AR, Stark, H, Humphries, MM, McAdam, AG, Barnes, BM, Boutin, S and CL Buck. Biologging in small mammals: light loggers reveal weather-driven changes in the daily activity patterns of arboreal and semi-fossorial rodents. Journal of Mammalogy. 
7. Stevenson, TJ, Buck, CL and KN Duddleston (2014) Temporal dynamics of the cecal gut microbiota of juvenile arctic ground squirrels: a strong litter effect across the first active season. Applied Environmental Microbiology, 80(14), 4260-4268. 
8. Ellsworth, A, Buck, CL, Atkinson, S, and T. Hollmen (2014) Longitudinal monitoring of sex steroid hormones in excrement of spectacled eiders (Somateria fischeri). General and Comparative Endocrinology 198 pp. 59-65. 


9. Williams, CT, Barnes, BM, Kenagy, GJ and CL Buck. Penology of hibernation and reproduction in squirrels: integration of environmental cues with endogenous programming. Journal of Zoology. 
10. Sheriff, MJ, Fridinger, RW, Tøien, O, Barnes, BM and CL Buck (2013) Metabolic rate and pre-hibernation fattening in free-living arctic ground squirrels. Physiological and Biochemical Zoology. 86(5) DOI: 10.1086/673092 
11. Sheriff MJ, Richter M, Buck CL, Barnes BM (2013) Changing seasonality and phenology of free-living arctic ground squirrels; mechanisms and consequences. Philosophical Transactions of the Royal Society B, 368: 20120480. http://dx.doi.org/10.1098/rstb.2012.0480 (Special Issue Invited Submission) 
12. Ashley, NT, Schwabl, I, Goymann, W and CL Buck. (2013) Keeping time under the midnight sun: behavioral and plasma melatonin profiles of free-living Lapland longspurs (Calcarious lapponicus) during the Arctic summer. Journal of Experimental Zoology Part A. DOI: 10.1002/jez.1768 


13. Lee, TN, Buck, CL, Barnes, BM and DM. O'Brien (2012) A test of alternate models for increased tissue nitrogen isotope ratios during fasting in hibernating arctic ground squirrels. Journal of Experimental Biology.doi: 10.1242/?jeb.068528. 
14. Williams, CT, Richter, M, Kohl, F, Barnes, BM and CL Buck (2012) Hibernation and the circadian rhythm of body temperature in free-living arctic ground squirrels. Physiological and Biochemical Zoology. Vol. 85, No. 4, pp. 397-404. 
15. Sheriff, MJ, Williams, CT, Kenagy, GJ, Buck, CL and BM Barnes (2012 Thermoregulatory changes anticipate hibernation by 45 days: data from free-living arctic ground squirrels. American Journal of Physiology, B. 182:841-847. 
16. Williams, CT, Kohl, F, Barnes, BM and CL Buck (2012) The relationship between the phenology of hibernation and reproduction in free-living arctic ground squirrels. Ruf, Bieber, Arnold, Millesi (Eds.): Living in a Seasonal World: Thermoregulatory and Metabolic Adaptations. Part 1, 63-72, DOI: 10.1007/978-3-642-28678-0_6. 
17. Jinka, TR, Barrickman, ZA, Bogren, LK, Lee, TN, Olson, JM, Richter, MM, Salli, BM, Stevenson, TJ, Toien, O, Buck, CL, Drew, KL (2012) Potential Mechanisms of Metabolic Suppression Downstream of Central A1AR Activation During Onset of Torpor. Ruf, Bieber, Arnold, Millesi (Eds.): Living in a Seasonal World Thermoregulatory and Metabolic Adaptations. Part 3, 363-376, DOI: 10.1007/978-3-642-28678-0_32. 
18. Healy, JE, Burdett, KA, Buck, CL and GL Florant (2012) Sex differences in torpor patterns during natural hibernation in golden-mantled ground squirrels (Callospermophilus lateralis). Journal of Mammalogy. Vol. 93, No. 3, pp. 751-758. 
19. Williams, CT, Barnes, BM and CL Buck (2012) Body temperature rhythms persist under the midnight sun but disappear during hibernation in free-living arctic ground squirrels. Biology Letters. 8. 31-34 doi: 10.1098/rsbl.2011.0435 


20. Lee, TN, Fridinger, RW, Barnes, BM, Buck, CL and DM O'Brien. (2011) Estimating lean mass over a wide range of body composition: A calibration of deuterium dilution in the arctic ground squirrel. Rapid Communications in Mass Spectrometry. 25, 3491–3496. 
21. Williams CT, Sheriff MJ, Gaglioti B, Kohl F, Toien O, Buck CL, and Barnes BM (2011) Data logging of body temperatures provides precise information on phenology of reproductive events in an arctic hibernator. Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology 181:1101–1109 DOI: 10.1007/s00360-011-0593-z. 
22. Sheriff, MJ‡, Kenagy, GJ, Richter*, M, Lee, T*, Toien, O, Kohl,F, Buck, CL and BM. Barnes (2011) Phenological variation in annual timing of hibernation and breeding in two nearby populations of arctic ground squirrels. Proceedings of the Royal Society B. 278, 2369–2375 
23. Williams, CT‡, Goropashnaya, AV, Buck, CL, Fedorov, VB, Kohl,F, Lee, TN* and BM Barnes (2011) Hibernating above the permafrost: effects of ambient temperature and season on expression of metabolic genes in liver and brown adipose tissue of arctic ground squirrels. Journal of Experimental Biology. 214: 1300-1306. 


24. Williams, CT‡ and CL Buck (2010) Spatial and temporal variation in Tufted Puffin Fratercula cirrhata nestling diet quality and growth rates. Journal of Marine Ornithology. 38: 41-48. 
25. Romero, MC‡, Taplella, F‡, BG Stevens and Buck, CL. (2010) Oxygen consumption in Paralithodes platypus (Crustacea: Decapoda): influences of different stage, temperature and brood care. Journal of Crustacean Biology. 30(3) 393-400. 
26. Williams, CT‡ and CL Buck (2010) Using fatty acids as dietary tracers in seabird trophic ecology: theory, application and limitations. Journal of Ornithology. 151:531–543. 
27. Brewer, JH,O'Reilly, KM and CL Buck. (2010) Effect of nestling status and brood size on concentration of corticosterone of free-living kittiwake chicks. General and Comparative Endocrinology.166, 19-24. 


28. Williams, CT, Iverson, SA and CL Buck (2009) Dietary restriction affects adipose tissue fatty acid signatures of tufted puffin (Fratercula cirrhata) nestlings. Journal of Comparative Physiology, B: Biochemical, Systemic, and Environmental Physiology.711-720. 
29. Lee, TN, Barnes, BM and CL Buck (2009) Body temperature patterns during hibernation in a free-living Alaska marmot (Marmota broweri). Ethology, Ecology and Evolution. 21: 403-413. 
30. Karpovich, SA, Toien, O, Buck, CL and BM Barnes (2009) Energetics under Arctic conditions in the arctic ground squirrel. Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology. 179: 691-700. 
31. Tapella, F, MC Romero, BG Stevens and CL Buck. (2009) Substrate preferences of blue king crab Paralithodes platypus glaucothoe and first crab redistribution on natural substrates in the laboratory. Journal of Experimental Marine Biology and Ecology 372, 31-35. 
32. Haukenes, AH, El Majjati, SY, and Buck, CL. (2009) Effects of emersion, temperature and handling on the oxygen consumption of Tanner crabs (Chionoecetes bairdi) Journal of Crustacean Biology, 29(1): 91–95. 


33. Stevens, B. G., K. M. Swiney, and C. L. Buck. (2008) Thermal effects on embryo development and hatching for blue king crab Paralithodes platypus held in the laboratory, and a method for predicting dates of hatching. Journal of Shellfish Research. 27(5), 1255-1263. 
34. Buck, CL, Breton, A, Kohl, F, Toien, O, Barnes, BM. (2008) Overwinter body temperature patterns of free-living arctic ground squirrels (Spermophilus parryii). Lovegrove, B.G. and McKechnie, A.E. (eds.) 2008. Hypometabolism in animals: torpor, hibernation and cryobiology. University of KwaZulu-Natal, Pietermaritzburg. 317-326. 
35. Williams, CT, Kitaysky, AS, Kettle, AB and Buck, CL (2008) Corticosterone levels of tufted puffins vary with breeding stage, body condition index, and reproductive performance. General and Comparative Endocrinology. 58: 29-35. 
36. Kildaw, SD, Irons, DB and CL Buck. (2008) Habitat quality and metapopulation dynamics of Black-legged Kittiwakes. Marine Ornithology, 38: 35-45. 
37. Williams, CT, Iverson, SJ and CL Buck. (2008) Stable isotopes and fatty acid signatures reveal age- and stage-dependent foraging niches in tufted puffins. Marine Ecology Progress Series. 363: 287-298 
38. Brewer, JH, O'Reilly, KM and CL Buck. (2008) Effects of investigator disturbance on baseline and stress-induced levels of corticosterone concentrations of Black-legged kittiwake chicks (Rissa tridactyla). Journal of Field Ornithology. 79(4) 391-398. 
39. Williams, CT, Kitaysky, AS and CL Buck. (2008) Food restricted tufted puffin (Fratercula cirrhata) nestlings increase begging behavior without modulating total or free corticosterone. Journal of Ornithology. 149:277-283. 
40. Hanna, SK, Haukenes, AH, Foy, RJ and CL Buck. (2008) Temperature effects on Pacific cod following exhaustive exercise. Proceedings 24th Wakefield Symposium. Resiliency of gadid stocks to fishing and climate change. 239-250. 
41. Brewer, JH, O'Reilly, KM, Kildaw, SD and CL Buck. (2008)Interannual variation in the adrenal responsiveness of black-legged kittiwake chicks (Rissa tridactyla). General and Comparative Endocrinology. 156, 361-368. 
42. Haukenes, AH, Plante, S, and CL Buck. (2008)Endocrine and morphological characterization of reproductive cycles in wild and captive black rockfish, Sebastes melanops. North American Journal of Aquaculture. 20: 212-218. 
43. Hanna, SK, Haukenes, AH, Foy, RJ and CL Buck. (2008) Temperature effects on swimming performance and metabolic rate of Pacific cod (Gadus macrocephalus). Journal of Fish Biology.72, 1068-1078. 
44. Breton, AR, Kildaw, SD, Murra, KM, and CL Buck. (2008) Multilevel models reveal no cohort level variation in foraging effort to explain a regime shift in kittiwake (Rissa tridactyla) breeding success. Ecological Modeling. 212: 233-243. 
45. Stevens, BG & Buck, CL. (2008) EFH for Blue King Crab Paralithodes platypus Phase 2: Environmental effects on hatching, habitat selection and survival of juvenile crabs North Pacific Marine Research Board Final Report. 


46. Williams, CT, Kildaw, SD, and CL Buck (2007) Sex specific differences in body condition indices and seasonal mass loss in Tufted Puffins. Journal of Field Ornithology. 78(4): 369-378. 
47. Drew, KL, Buck, CL, Barnes, BM Christian, SL, Rasley, BT, & MB Harris. (2007) Central nervous system regulation of mammalian hibernation: implications for metabolic suppression and ischemia tolerance. Journal of Neural Chemistry. 102, 1713-1726. 
48. Williams, CT, Buck, CL, Sears, J, Kitaysky, AS. (2007) Effects of nutritional restriction on nitrogen and carbon stable isotopes in growing seabirds. Oecologia. 153, 11-18. 
49. Fridinger, R, O'Reilly, KM, Kildaw, SD and CL Buck. (2007) Impact of investigator disturbance on baseline levels of corticosterone of black-legged kittiwake chicks. Journal of Field Ornithology. 78(1):1-7. 
50. Whidden, SE, Williams, CT and CL Buck (2007) Effects of radio transmitters on tufted puffin (Fratercula cirrhata) reproductive success. Journal of Field Ornithology, 78(2) 206-212. 
51. Buck, CL, O'Reilly, KM, and SD Kildaw. (2007). Interannual variability of Black-legged Kittiwake productivity is reflected in baseline plasma corticosterone. General and Comparative Endocrinology. 150:430-436. 
52. Williams, CT and CL Buck. (2007) Tufted Puffins as biological indicators of forage fish availability in the Gulf of Alaska: assessing diets using stable isotopes and fatty acid signature analysis. North Pacific Marine Research Board Final Report.77pp. 


53. Haukenes, AH and Buck, CL. (2006). Characterization of the osmoregulatory, metabolic, and endocrine stress responses in Pacific halibut following a 30-minute hypoxia stressor and the influence of post-capture handling techniques. Journal of Applied Ichthyology. 22:387-387. 


54. Kildaw, SD, Irons, DB, Nysewander, DR and Buck, CL. 2005. Patterns of colonization and population dynamics of new Black-legged Kittiwake colonies. Marine Ornithology, 33:49-58. 
55. Buck, CL & Jenkins,JL. 2005. Plasma leptin and body composition in post-hibernation thirteen-lined ground squirrels. PSDAS. 84: 295-303. 


56. Lane, J.E., Buck, CL and R.M. Brigham. 2003. The bat fauna of southeastern South Dakota. The Prairie Naturalist 35(4): 247-256. 
57. Buck, CL & Barnes, BM. 2003. Androgen in Free-living Arctic Ground Squirrels: Seasonal Changes and Influence of Staged Male-Male Aggressive Encounters. Hormones and Behavior. 43: 318-326. 


58. Barnes, BM & Buck CL. 2000. Hibernation in the extreme: burrow and body temperatures, metabolism, and limits to torpor bout length in arctic ground squirrels In: Life in the Cold (G. Heldmaier & M. Klingenspor eds.) Springer-Verlag Berlin. 
59. Buck, CL & Barnes, BM. 2000. Effects of ambient temperature on metabolic rate, respiratory quotient, and torpor in an Arctic hibernator. American Journal of Physiology; Regulatory, Integrative Comparative Physiology. 279: R255-R262. 


60. Buck, CL & Barnes, BM. 1999. Annual cycle of body condition and hibernation in free-living arctic ground squirrels. Journal of Mammalogy. 80(2), 430-442. 
61. Buck, CL & Barnes, BM. 1999. Influence of hibernaculum temperatures on overwinter change in Arctic ground squirrel body condition. Journal of Mammalogy 80(4). 


62. Buck, CL 1998. The physiological ecology of the arctic ground squirrel: energy metabolism, torpor, and behavioral endocrinology. Ph.D. dissertation, University of Alaska Fairbanks, Fairbanks, AK. 


63. Boyer, BB, Ormseth, OA, Buck, CL, Nicolson, M, Pellymounter, MA, Barnes, BM, 1997. Leptin reduces posthibernation weight gain but does not reduce energy expenditure in arctic ground squirrels. Comp. Biochem. Physiol. 118: 3.