[Coral-List] Ship wrecks and reefs??

[John Ware]

A quote from: Black reefs: iron-induced  phase shifts on coral reefs.
Linda Wegley Kelly et al., ISME, Mar 2012

"Here we use a combination of benthic surveys, chemistry, metagenomics 
and microcosms to investigate if and how shipwrecks initiate and 
maintain black reefs. ...   Together these results demonstrate that 
shipwrecks and their associated iron pose significant threats to coral 
reefs in iron-limited regions."

Contrasted with this from Alina Szmant's e-mail of 26Nov:

"FYI, every place I dive where there is metal structure (old ship hulls, navigation pilings etc) they are covered with nice looking corals of all species."

Am I the only one that sees some sort of disconnect here??
John


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