Abstract
The effects of climate change on hibernating species will depend, in part, on their responsiveness to environmental cues used to adjust the seasonal timing of annual events of hibernation and reproduction. Using long-term data collected from two arctic ground squirrel populations living 20 km apart in northern Alaska, we investigate the relationships between the timing of hibernation and reproduction and, in addition, the potential for change in soil temperatures to act as a proximate cue. Previously, we found that female ground squirrels living at the southern-most site, Atigun River, emerge from hibernation and give birth 13 days earlier than females at Toolik Lake. Here we show that timing of parturition was tightly linked to the termination of heterothermy and subsequent emergence from the hibernacula at both sites, whereas timing of entrance into hibernation was only weakly correlated with date of parturition in Toolik Lake females. Females ended heterothermy in spring coincident with rising soil temperatures from winter minima, but since average soil temperatures did not differ between the two sites, a single threshold in warming cannot explain the differences in timing of spring emergence and reproduction between the two populations. Earlier reproduction at Atigun is associated with earlier snowmelt, yet, how this is achieved and the relative importance of phenotypic plasticity versus genetic differences between the two populations will require further investigation.
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References
Barnes BM (1989) Freeze avoidance in a mammal: body temperatures below 0°C in an arctic hibernator. Science 244:1593–1595
Berteaux D, Réale D, McAdam AG, Boutin S (2004) Keeping pace with fast climate change: can arctic life count on evolution? Integr Comp Biol 44:140–151
Broussard DR, Dobson FS, Murie JO (2008) Previous experience and reproductive investment of female Columbian ground squirrels. J Mammal 89:145–152
Buck CL, Barnes BM (1999a) Temperatures of hibernacula and changes in body composition of arctic ground squirrels over winter. J Mammal 80:1264–1276
Buck CL, Barnes BM (1999b) Annual cycle of body composition and hibernation in free-living arctic ground squirrels. J Mammal 80:430–442
Buck CL, Barnes BM (2003) Androgen in free-living arctic ground squirrels: seasonal changes and influence of staged male–male aggressive encounters. Horm Behav 43:318–326
Buck CL, Breton A, Kohl F, Tøien Ø, Barnes BM (2008) Overwinter body temperature patterns in free-living arctic squirrels (Spermophilus parryii). In: Lovegrove BG, McKechnie AE (eds) Hypometabolism in animals: torpor hibernation and cryobiology. University of KwaZulu-Natal, Pietermaritzburg, pp 317–326
Høye TT, Post E, Meltofte H, Schmidt NM, Forchhammer MC (2007) Rapid advancement of spring in the High Arctic. Curr Biol 17:R449–R451
Inouye DW, Barr B, Armitage KB, Inouye BD (2000) Climate change is affecting altitudinal migrants and hibernating species. Proc Natl Acad Sci 97:1630–1633
Kenagy GJ (1980) Interrelation of endogenous annual rhythms of reproduction and hibernation in the golden-mantled ground squirrel. J Comp Physiol A 135:333–339
Lacey EA (1991) Reproductive and dispersal strategies of male Arctic ground squirrels (Spermophilus parryii plesius). Ph.D. thesis, University of Michigan
Lane JE, Kruuk LEB, Charmantier A, Murie JO, Coltman DW, Buoro M, Raveh S, Dobson FS (2011) A quantitative genetic analysis of hibernation emergence date in a wild population of Columbian ground squirrels. J Evol Biol 24:1949–1959
Long RA, Hut RA, Barnes BM (2007) Simultaneous collection of body temperature and activity data in burrowing mammals: a new technique. J Wildl Manage 71:1375–1379
Murie JO, Harris MA (1982) Annual variation of spring emergence and breeding in Columbian ground squirrels (Spermophilus columbianus). J Mammal 63:431–439
Ozgul A, Childs DZ, Oli MK, Armitage KB, Blurnstein DT, Olson LE, Tuljapurkar S, Coulson T (2010) Coupled dynamics of body mass and population growth in response to environmental change. Nature 466:482–485
Post E, Forchhammer MC (2008) Climate change reduces reproductive success of an arctic herbivore through trophic mismatch. Phil Trans R Soc B 363:2367–2373
Post E, Forchhammer MC, Bret-Harte MS, Callaghan TV, Christensen TR, Elberling B, Fox AD, Gilg O, Hik DS, Høye TT, Ims RA, Jeppesen E, Klein DR, Madsen J, McGuire AD, Rysgaard S, Schindler DE, Stirling I, Tamstorf MP, Tyler NJC, van der Wal R, Welker J, Wookey PA, Schmidt NM, Aastrup P (2009) Ecological dynamics across the Arctic associated with recent climate change. Science 325:1355–1358
Réale D, McAdam AG, Boutin S, Berteaux D (2003) Genetic and plastic responses of a northern mammal to climate change. Proc Roy Soc B 270:591–596
Serreze MC, Francis JA (2006) The Arctic amplification debate. Clim Change 76:241–264
Sheriff MJ, Kenagy GJ, Richter M, Lee T, Tøien Ø, Kohl F, Buck CL, Barnes BM (2011) Phenological plasticity: variation in annual timing of hibernation and breeding in two nearby populations of arctic ground squirrels. Proc Roy Soc B 278:2369–2375
Visser ME, Both C (2005) Shifts in phenology due to global climate change: the need for a yardstick. Proc Roy Soc B 272:2561–2569
Visser ME, Caro SP, van Oers K, Shaper SV, Helm B (2010) Phenology, seasonal timing and circannual rhythms: towards a unified framework. Proc Roy Soc B 365:3113–3127
Williams CT, Goropashnaya AV, Buck CL, Fedorov VB, Kohl F, Lee TN, Barnes BM (2011a) 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. J Exp Biol 214:1300–1306
Williams CT, Sheriff MJ, Schmutz JA, Kohl F, Tøien Ø, Buck CL, Barnes BM (2011b) Data logging of body temperatures provides precise information on phenology of reproductive events in a free-living arctic hibernator. J Comp Physiol B 181:1101–1109
Williams CT, Barnes BM, Buck CL (2012) Body temperature rhythms persist under the midnight sun but are absent during hibernation in free-living arctic ground squirrels. Biol Lett 8:31–34. doi:10.1098/rsbl.2011.0435
Acknowledgments
Funding was provided by the National Science Foundation (EF-0732763 and -0732755) to CLB and BMB and the US Army Medical Research and Materiel Command Grant #05178001 to BMB. We thank Trixie Lee and Melanie Richter for their invaluable help in gathering field data.
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Williams, C.T., Sheriff, M.J., Kohl, F., Barnes, B.M., Buck, C.L. (2012). Interrelationships Among Timing of Hibernation, Reproduction, and Warming Soil in Free-Living Female Arctic Ground Squirrels. In: Ruf, T., Bieber, C., Arnold, W., Millesi, E. (eds) Living in a Seasonal World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28678-0_6
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DOI: https://doi.org/10.1007/978-3-642-28678-0_6
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