"In our recent study"

where have You published the results?

The manuscript is almost complete, but it is not submitted yet.

OK... so it is not existing

I can help You, but only in January 2014

While it does not address mechanism, here are papers documenting recent cold-water mortality in Florida:

http://www.plosone.org/article/info:doi/10.1371/journal.pone.0023047

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.2011.02487.x/abstract

http://link.springer.com/article/10.1007/s00338-012-0880-5#