Funding for this research was provided by:
U.S. Geological Survey (G13AC00326)
Article History
Received: 3 November 2016
Accepted: 9 November 2017
First Online: 22 November 2017
Compliance with Ethical Standards
:
: NMD and GAB declare that they have no competing interests. AMM has been funded through federal finanaical assistance awards by the DOI CSCs.