When using hreflang in order to deliver the relevant version in SERs, should we also make use of a reference to a canonical version to avoid duplication?
Currently, we provide different regional versions of our content where the content is largely the same aside from minor changes due to spelling, units of measurement although occasionally larger amends are required.
We have implemented hreflang referencing all the alternative country Urls, e.g en-us, en-gb, en-aus etc but also specificied the canonical as the en-gb version since we are a UK based website and the majority of the content originated from the UK version of our site.
Recently, our rankings across all countries have been falling markedly and I'm wondering whether the canonical element may be at fault. We have not been engaging in any black hat activities that might have been responsible for any sort of fall.
When we implemented the hreflang and canonical in July 2012 our traffic has actually been increasing significantly until literally 21 Nov when the search traffic is plummeting considerably across all countries. It would be useful to know if you need to specify a canonical version when using hreflang or could there be another reason for our ranking falls.
Many thanks in advance of your assistance.