chikida said:
My thinking was that if the sandbars shifted significantly inland that would reduce the bathing buffer of swimmers and surfers and so we would see an increase in the probability of recent encounters- it's just a theory but thought I'd ask.
The attack ocurred pretty far out. I'm not so sure anything is different and maybe it was just an unfortunate encounter. People all around and in the media are trying to detemine some reason for it. maybe there is one - I don't know.
If there are more sharks close to shore than normal it could be any one of a dozen factors such as water temps, currents, oxygen levels, baitfish patterns, etc . . . .
There are 2 factors I can think of that have changed since last summer. 2 major storms that have changed the topography of the beaches, sand bars, and probably depths offshore. These storms also may have changed a whole host of other things not readily apparent such as water temps, currents, marine populations and patterns, etc.
The other factor that is easy to observe is the lack of June Grass which is usually thick in the water starting in May or June and lasting a few months. We got a lot of sargassum weed this year but no June grass. That shows you that the water is not the way it usually is. I don't know if there's a connection, but I'll bet sharks don't like swimming in the thick green stuff anymore than we do. The lack of June grass also shows that some other things connected to its absence probably have changed.
Also, When there's a lot of June grass in the water people may be less likely to see sharks near the beach if they are there because they are obscured.
A 3rd factor that may be important is the banning of large gill nets for commercial fishing in 1994. These nets scooped up everything in their path, including many species of fish and animals in the food chain that weren't wanted for sale but were killed nonetheless. Since the net ban we have seen many more fish in the gulf and many species were depleted for a long time before that. No doubt those nets also inadvertently killed sharks and their food.
Only time will tell. In a way I find it amazing we haven't had a shark-related fatality in SoWal in 100 years.