Icing events trigger range displacement in a high-arctic ungulate.

Despite numerous studies of how climate change may affect life history of mammals, few have documented the direct impact of climate on behavior. The Arctic is currently warming, and rain-on-snow and thaw-freeze events leading to ice formation on the ground may increase both in frequency and spatial extent. This is in turn expected to be critical for the winter survival of arctic herbivores. Svalbard reindeer (Rangifer tarandus plathyrynchus) have small home ranges and may therefore be vulnerable to local "locked pasture" events (ice layers limit access to plant forage) due to ground-ice formation. When pastures are "locked," Svalbard reindeer are faced with the decision of staying and live off a diminishing fat store, or trying to escape beyond the unknown spatial borders of the ice. We demonstrate that Svalbard reindeer do the latter, as icing events cause an immediate increase in range displacement between 5-day observations. Population-level responses of previous icing events may therefore not accurately predict future responses if the spatial extent of icing increases. The impact of single events may be more severe if it exceeds the maximum movement distances, so that the spatial displacement strategy reported here no longer buffers climate effects.

[1]  M. Forchhammer,et al.  Nonlinear effects of climate and density in the dynamics of a fluctuating population of reindeer. , 2008, Ecology.

[2]  B. Kendall,et al.  Longevity can buffer plant and animal populations against changing climatic variability. , 2008, Ecology.

[3]  E. Post,et al.  Climate change reduces reproductive success of an Arctic herbivore through trophic mismatch , 2008, Philosophical Transactions of the Royal Society B: Biological Sciences.

[4]  Liana N. Joseph,et al.  See Blockindiscussions, Blockinstats, Blockinand Blockinauthor Blockinprofiles Blockinfor Blockinthis Blockinpublication Evolutionary Blockinresponses Blockinto Blockinclimate Blockinchange , 2022 .

[5]  A. Mysterud,et al.  Activity pattern of arctic reindeer in a predator-free environment: no need to keep a daily rhythm , 2007, Oecologia.

[6]  A. Mysterud,et al.  Testing five hypotheses of sexual segregation in an arctic ungulate. , 2006, The Journal of animal ecology.

[7]  Eric Post,et al.  LARGE‐SCALE SPATIAL GRADIENTS IN HERBIVORE POPULATION DYNAMICS , 2005 .

[8]  J. Kohler,et al.  Effect of Winter Snow and Ground-Icing on a Svalbard Reindeer Population: Results of a Simple Snowpack Model , 2004 .

[9]  Arctic Monitoring,et al.  Impacts of a warming Arctic : Arctic Climate Impact Assessment , 2004 .

[10]  Acia Impacts of a Warming Arctic: Arctic Climate Impact Assessment , 2004 .

[11]  Barrie R. Bonsal,et al.  An Assessment of Changes in Winter Cold and Warm Spells over Canada , 2003 .

[12]  G. Roe,et al.  Rain‐on‐snow events impact soil temperatures and affect ungulate survival , 2003 .

[13]  J. Aars,et al.  Intrinsic and climatic determinants of population demography: The winter dynamics of tundra voles , 2002 .

[14]  Atle Mysterud,et al.  Climate, changing phenology, and other life history traits: Nonlinearity and match–mismatch to the environment , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[15]  Kung-Sik Chan,et al.  Ecological Effects of Climate Fluctuations , 2002, Science.

[16]  S. Albon,et al.  The role of parasites in the dynamics of a reindeer population , 2002, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[17]  B. Sæther,et al.  Effects of density-dependence and climate on the dynamics of a Svalbard reindeer population , 2001 .

[18]  B T Grenfell,et al.  Age, sex, density, winter weather, and population crashes in Soay sheep. , 2001, Science.

[19]  Atle Mysterud,et al.  Nonlinear effects of large-scale climatic variability on wild and domestic herbivores , 2001, Nature.

[20]  Marcel E. Visser,et al.  Warmer springs disrupt the synchrony of oak and winter moth phenology , 2001, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[21]  J. Gaillard,et al.  Temporal Variation in Fitness Components and Population Dynamics of Large Herbivores , 2000 .

[22]  B. Sæther,et al.  Fluctuations of an introduced population of Svalbard reindeer: the effects of density dependence and climatic variation , 2000 .

[23]  A. Mysterud Seasonal migration pattern and home range of roe deer (Capreolus capreolus) in an altitudinal gradient in southern Norway , 1999 .

[24]  R. Ims,et al.  Space-use responses to habitat fragmentation and connectivity in the root vole Microtus oeconomus , 1998 .

[25]  N. Tyler,et al.  Why don't Svalbard reindeer migrate? , 1989 .

[26]  W. Vanderknaap PAST VEGETATION AND REINDEER ON EDGEOYA (SPITSBERGEN) BETWEEN C-7900 AND C-3800 BP, STUDIED BY MEANS OF PEAT LAYERS AND REINDEER FECAL PELLETS , 1989 .

[27]  A. Gunn,et al.  Evidence for and possible causes of increased mortality of bull muskoxen during severe winters , 1989 .

[28]  A. N. Moen Energy Conservation by White‐Tailed Deer in the Winter , 1976 .