In my ponds the RES are definitely shallow. I've seen them 6" from the bank. They also share spawning areas with the BG. However, in the biggest pond, they begin staking out prime bedding sites before the BG do. Both species will eventually be on the nests' together, but the RES seem to be the first to start thinking about it, by just a day or two.

Maybe they're just better planners.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.