Re: Does pollen = nectar?
Pollen coming in does not necessarily mean nectar is also coming in, or available. Bees can collect pollen from frost-killed plants that no longer have nectar. And they can collect pollen from plants that never offer nectar. Here's one reference:
There are multiple reports of bees foraging in chicken feeders, possibly for grain dust, with little chance of there being real pollen in chicken feed.
USDA Zone 7A Elevation 1400 ft