Here's what I think will happen.
First, the bluegill will become established. The redear might...if they have plenty of weedy habitat that harbors snails.
The green sunfish numbers will diminish over the next three years to the point that your catch rates of them will diminish to almost nothing. By then, the bluegill will have some nice sized adults, and based on your harvest of largemouth bass, bluegill numbers could continue to be in balance.
Here's why all this will happen.
Green sunfish, even though they have a larger mouth and can compete against fish with similar mouth size, only reproduce once a year.
Bluegill can eat smaller meals, ultimately depriving green sunfish the heartiest of meals. Bluegill, in Alvord, Texas, will reproduce four to five times yearly.
Bottom line...bass eat all year and when that young age class of green sunfish comes off the nest, their lives will be cut short by an expanding bass population.
Bluegill eat smaller items than green sunfish and they reproduce considerably more, so bluegills will have a long term dominance opportunity the green sunfish don't have.
Green sunfish are predators, limited by their mouth size and how large they can grow. A two pound bass will suck down a full grown green sunfish like my little grandson inhales a popsicle in this heat.
Speaking of which...if your pond evaporates and dries, all this advice is moot.
