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Interestingly, I'm pretty tied into the research done regarding diver pressure on reefs. There are active studies going on in Dry Tortugas, Hawaii, St. Lucia, Grand Cayman, and a host of other places. Turns out, divers don't impact the reef much. Do they touch it? Of course, and damage it? Well, yes, but the damage is typically light and the reef recovers in a short period of time.You may call it "limiting competition" but others may call it "resource management". The reefs do not expand because more shops are created. Maybe the idea isn't that xx shops are "enough" for competition but that yy divers are all the reefs can handle without degrading?
Snorkelers, OTOH, devastate the reef. Some theories are that snorkelers are not trained to not stand up on the coral. Snorkelers pee in the water, and snorkelers show up at the same reef the snorkel boat showed up at yesterday and tomorrow in herds, not like divers who show up in small (relatively) batches. In Key West, the snorkel boat brings 149 snorkelers, there are 5 to 9 boats on Sand key twice a day, all with plenty of used Mai-tai's and Bud Light that needs to be disposed of. Meanwhile, the Fling shows up at the Flower Gardens with 34 divers 30 times a year for 2 dives on a buoy on a good year. Even in Cozumel or Key Largo, you might get 1000 dives a day in for all operators on 25 miles of reef. No comparison to the thousands of snorkelers who all go to the exact same spot day after day.