Acknowledgments
We are grateful to Francesco Cicconardi and Krzysztof Kozak for their provision of data and advice on data handling. We also thank Fletcher Young for sharing his research and knowledge. The authors are funded by a Biotechnology & Biological Sciences UK (BBSRC) SWBio grant to C.F.M. BB/M009122/1 and Natural Environment Research Council UK (NERC) Fellowship NE/N014936/2 to S.H.M.