Juhani:Are you sure MNR has replaced SMR???
My apologies for the delay in reply- I have been away from the computer. In short, I am not sure that that MNR has replaced SMR but the paper indicates the following:
The terminology SMR implies an active contribution of an external agent to the reproduction failure of varroa, even though such failure can be intrinsic to the varroa, as described above. This is why the new terminology, mite non-reproduction (MNR), has been recently proposed and will be used thereafter in this study.
The paper cross-references the following research which defines the terms as follows:
Mite non-reproduction (MNR)- Failure of a foundress mite to produce at least one adult, mated female that will enter the colony’s mite population when the developing bee emerges from the cell as an adult bee. A foundress mite will not be successful at reproduction if she does not lay any eggs (infertile), lays only one egg, produces no male offspring or begins laying her eggs too late in relation to the pupal development.
Suppressed mite reproduction (SMR)- Redefined as only cases of mite non-reproduction that are regulated by traits expressed by the brood.
So I would understand this to mean that MNR has been applied to represent what was previously defined as SMR, and that SMR has been given a new definition that explicitly relates to brood-driven resistance mechanisms.