pcmankey":1t7g44y4 said:
1) These are not the only two possiblities, and the most egregious assumption on your part is that this bacteria resides in humans and this one coral only. It would be extraordinary if the pathogen resided only in humans and one single species of coral.
2)Ergo, it is possble that the origin is something else, and since humans have been there in the Keys for a long long time, why would it only show up now?
1) I'll confess to not knowing much about Serratia. However, in my cursory look at the literature both online, and in hits that our University library pulled up, it seems that serratia is concentrated in the human gut, and is relegated to causing rare diseases in humans, with little to no reporting on how wide-spread it is. I am led to beleive that it does not occur in heavy amounts in other animals, and I have yet to find incidence of a listing of a reef animal that can host the bacterium. Indeed, A. palmata is not a suitable host and has only recently succumbed to it as a parasitic disease.
2) I personally believe, and the literature supports the idea, that the main reasons the Keys are experiencing such exponentially increasing decline, is due to a few different things. Firstly, coral bleaching from increase SST anomolies has been on the rise. 1989, 1993, and 1998 were extremely stressful to reefs worldwide and the Keys
saw huge die-offs. Those that lived have remained stressed as measured by gene expression from the work of Mark Warner and also of Terry Snell. Also, nutrient levels have been on the increase, as well as salinity. The Everglades Forever Act is attempting to address the salinity issue. 150 years of changed hydrologic patterns have caused many problems in the Everglades, and even the BAy and reefs. It will cost Federal Taxpayers $8 Billion to fix these problems.
A great introductory book, filled with incredibly recent work on the Florida ecosystems, and also containing great background material and maps has very recently become available.
IT is called:
The Evergaldes, Florida Bay, and Coral Reefs of the Florida Keys: An Ecosystem Sourcebook.
Editors: James W Porter and Karen G Porter.
available here at
www.crcpress.com It was published earlier this year.
Cheers,
Brian