Not everyone has access to full peer-review papers, so it's perfectly
acceptable to reference an abstract.  In fact, I'd much prefer posters
reference *something.  *

Here's a quote from a follow up study to the original reference:

https://link.springer.com/article/10.1007/s13592-017-0519-1

*"...We know that colonies living in the wild occupy small nest cavities
and swarm frequently, and that these traits of wild colonies provide them
with resistance to Varroa (Loftus et al. 2016
<https://link.springer.com/article/10.1007/s13592-017-0519-1#ref-CR13>).
....  The mechanisms whereby smaller and swarmier colonies have greater
resistance to V. destructor are not understood fully, but it is likely that
having relatively few brood, especially drone brood, helps control the
mites....*

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