# Wild reindeer winter migratory patterns (Hardangervidda, Norway): what resilience under climate change?

Romain Courault, Marianne Cohen, Josyane Ronchail

► To cite this version:

Romain Courault, Marianne Cohen, Josyane Ronchail. Wild reindeer winter migratory patterns (Hardangervidda, Norway): what resilience under climate change?. European Geosciences Union 2018 - 20th EGU General Assembly, Apr 2018, Vienne, Austria. 20, pp.17363, 2018, Geophysical Research Abstracts. hal-01800370

HAL Id: hal-01800370

https://hal.science/hal-01800370

Submitted on 19 Jun 2023

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# Wild reindeer migratory pattern (Hardangervidda, Norway): what resilience under climate change?

R. Courault (1), M. Cohen (1), and J. Ronchail (2)

(1) UMR 8185 Espaces Nature et Culture; Sorbonne-Université - Faculté des Lettres, Geography, Paris, France
(2) UMR 7159 LOCEAN-IPSL; Sorbonne-Université - Faculté des Sciences, Climatology, Paris, France

<figure><img src="image_2.png" /></figure>

<figure><img src="image_3.png" /></figure>

SORBONNE
UNIVERSITÉ

<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

## Introduction (1)

<figure><img src="image_6.png" /><figcaption>NAO impact on winter temperature</figcaption></figure>

<figure><img src="image_7.png" /></figure>

Casado et al (2013)

<figure><img src="image_8.png" /><figcaption>Figure 2: Winter NAO reconstruction using Scotland and Morocco precipitation as proxies (grey area and black line) and observed NAO index series (blue line), source: P. Ortega, 2015, Our Common Future Conference, Paris, 2015 July 7-10</figcaption></figure>

Recent global warming has strong impacts on both atmospheric and climatic variability.

In Europe, Northern Atlantic Oscillation is the most occuring teleconnexion mode, particularly during winter. (Hurrel, 1995) Positive phases are associated with milder and wetter types of weather than average (fig.1; Casado et al. 2013).

Associated with increased annual temperatures in Scandinavia, milder and wetter conditions in winter have a lot of direct and indirect effects on sub-arctic ecosystem structure (hydrological and cryosphere cycle) and functions (borealization of floristic and faunistic communities, Wrona et al., 2016)

## Material and methods

DATA
ACQUISI
-TION

* Hardangervidda wild reindeer' GPS tracks, 2007-2010, (Cagnacci et al. 2016, https://datadryad.org)

* NAO daily index, 2007-2010, www.cpc.ncep.noaa.gov

* Local meteorological records, 2007-2010, Høydalsmo & Rauland stations (www.eklima.org)

CENTRALIZATION

* From 3 hours GPS logs to 1 day (mean)

* From individuals to the whole monitored reindeer population

* One day from November to February (2007-2010) = 1 latitude, 1 longitude, 1 NAO index, 1 T°C mean, 1 precipitation...

STATISTICS

* Linear regression (Spearman correlation coefficient) between recorded GPS latitudes and longitudes, atmospheric and meteorological tested factors

* Selection of significant correlations (α ≥ 0,3; p≤ 0,05)

## References

- CASADO, M., ORTEGA, P., MASSON-DELMOTTE, Valérie, et al. Impact of precipitation intermittency on NAO-temperature signals in proxy records. *Climate of the Past*, 2013, vol. 9, no 2, p. 871-886.
- CAGNACCI, Francesca, FOCARDI, Stefano, GHISLA, Anne, et al. How many routes lead to migration? Comparison of methods to assess and characterize migratory movements. *Journal of Animal Ecology*, 2016, vol. 85, no 1, p. 54-68.
- HURRELL, James W. Decadal trends in the North Atlantic Oscillation: regional temperatures and precipitation. *Science*, 1995, vol. 269, no 5224, p. 676-679.
- GUNN, A. 2016. *Rangifer tarandus*. The IUCN Red List of Threatened Species 2016.

- UBONI, Alessia, HORSTKOTTE, Tim, KAARLEJÄRVI, Elina, et al. Long-term trends and role of climate in the population dynamics of Eurasian reindeer. *PloS one*, 2016, vol. 11, no 6, p. e0158359.
- WRONA, Frederick J., JOHANSSON, Margareta, CULP, Joseph M., et al. Transitions in Arctic ecosystems: Ecological implications of a changing hydrological regime. *Journal of Geophysical Research: Biogeosciences*, 2016, vol. 121, no 3, p. 650-674
- GUNN, A. 2016. *Rangifer tarandus*. The IUCN Red List of Threatened Species 2016.

## More informations

Courault.romain@gmail.com

https://www.researchgate.net/profile/Romain_Courault