Correction to: Nature Ecology & Evolution https://doi.org/10.1038/s41559-017-0330-4 (2017); published online 2 October 2017.

In Fig. 2 of this Article originally published, some erroneous lines appeared on the left side of the images in panels c, e and g. The figure should have appeared as shown below. These errors have now been corrected in all versions of the Article.