From the paper. 'Honey yields across the United States have decreased appreciably since the 1990s, concurrent with shifts in climate, land-use, and large-scale pesticide application...honey yields at the state level... can be considered
a proxy for trends in floral resource availability
for both managed and wild pollinators...'

But I'm wondering. Wouldn't it be as important (since yield is expressed in kgs/hive) to include analysis of a) hive numbers and b)honey prices over the two relevant periods? Are surveys of honey yields a reasonable proxy?

Examining spatial and temporal drivers of pollinator nutritional resources: evidence from five decades of honey bee colony productivity data.

https://www.beeculture.com/bee-making-less-honey/

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