Funding for this research was provided by:
U.S. Geological Survey
Text and Data Mining valid from 2019-06-10
Received: 1 October 2018
Accepted: 30 May 2019
First Online: 10 June 2019
Ethics approval and consent to participate
: All work has been conducted with appropriate permits and permissions, including approval of the University of Alaska Fairbanks and the USGS Alaska Science Center Animal Care and Use Committee (Assurance #07-049).
: Not applicable.
: The authors declare that they have no competing interests.