Scientific Reports 4, Article number: 5073 (2014); Published: 27 May 2014; Updated: 26 November 2014

The original version of this Article contained a typographical error in the spelling of author L. Knittweis which was incorrectly given as L. Knitweiss.

Additionally, the original version of the Article also contained errors in the affiliations of L. Knittweis and M. L. Pace. The correct affiliations are listed below:

L. Knittweis: Department of Biology, University of Malta, Msida MSD2080 (Malta)

M. L. Pace: Department of Fisheries and Aquaculture, Fisheries Resource Unit, Ministry for Sustainable Development, the Environment and Climate Change (MSDEC-FRU), Ghammieri, Marsa MRS 3303 (Malta)

These errors have now been corrected in the PDF and HTML versions of the Article.