A Summer Heat Wave Reduced Activity, Heart Rate, and Autumn Body Mass in a Cold-Adapted Ungulate

We are grateful for the feedback from Robyn Hetem and for the constructive inputs from the two anonymous reviewers. We thank Clare Stawski and Murray M. Humphries for commenting on an earlier version of the manuscript. Fieldwork would not be possible without the collaboration with the Reindeer Herders’ Association and the local support from Mika Tervonen, Unto Paadar, Jukka Siitari, and field assistants Elise Tjørnsletten, Kine Øren, and Erlend Søby. Veterinarians Marja Nourgam and Amanda Høyer Boesen contributed to the anesthesia and surgery of the reindeer. We thank Àsgeir Bjarnason at Star-Oddi for help and guidance with biologger programming and data processing and Larissa Beumer for advice on the hidden Markov model approach. Cassandra Ugland validated the heart rate measurements. The work was supported by the Norwegian Research Council (grants 267613 and 315454). L.E.L., A.L.E., E.R., J.R.S., E.K., and L.M.T. planned the study. J.K. facilitated the fieldwork. E.R., A.L.E., L.M.T., J.K., and L.E.L. conducted the fieldwork, including device deployment, retrieval, and animal handling. L.M.T. curated and analyzed the data together with G.P. L.M.T. drafted the manuscript with input from S.A. All authors contributed to editing and approved the final version of the manuscript. The prior authorization for all procedures carried out on the reindeer in this study was granted by the Animal Experiment Board at the Regional State Administrative Agency in Finland (license ESAVI/3857/04.10.07/2017).Peer reviewedPublisher PD