In the paper by Harley et al. (2006), the following reference was omitted in error. Our apologies for any confusion caused.

Southward, A.J., Hawkins, S.J. & Burrows, M.T. (1995). Seventy years’ observations of changes in distribution and abundance of zooplankton and intertidal organisms in the western English Channel in relation to rising sea temperature. J. Therm. Biol., 20, 127–155.