Funding for this research was provided by:
National Science Foundation (DEB-1353827, DEB-0608178)
Article History
Received: 28 July 2016
Accepted: 5 April 2017
First Online: 19 April 2017
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Data and R scripts are available on the Dryad Digital Repository (doi:) and on GitHub ().