[Coral-List] Ship wrecks and reefs??

[Eesat Atikkan]

I am not sure how germane this observation is but:
Off WPB, FL tubastrea is prolific on wrecks (mostly artificial reefs), but absent from the reefs.  
The wrecks tend to be deeper - 75 ft and deeper.
However there are also deep reefs, e.g. Double Ledges, that are in the 80-100 ft range yet there has been no reports of tubastrea.
We first encountered tubastrea ca. 13 years ago on the artificial wreck set named Governor's Walk.  Its is possible that it arrived with the wrecks of the AR program.  Or it may be part of the northward progression of the species
Esat

--- On Thu, 11/29/12, Greg Challenger <gchallenger at msn.com> wrote:

> From: Greg Challenger <gchallenger at msn.com>
> Subject: Re: [Coral-List] Ship wrecks and reefs??
> To: "mtupper at coastal-resources.org" <mtupper at coastal-resources.org>
> Cc: "coral-list at coral.aoml.noaa.gov" <coral-list at coral.aoml.noaa.gov>
> Date: Thursday, November 29, 2012, 3:39 PM
> Perhaps it would be better to start
> with people's observations of iron wrecks without coral as
> opposed to those with coral.  It seems we have all seen
> them covered in coral.  
> 
> Sent from my iPhone
> 
> On Nov 28, 2012, at 8:09 PM, "Mark Tupper" <mtupper at coastal-resources.org>
> wrote:
> 
> > I would have to agree with Alina. I cannot reconcile
> the quote in the ISME article with the wreck dives I have
> done in Micronesia (Chuuk or Peleliu, for 
> > example). Also, people have been sinking metal
> structures (ships, planes, cars, oil rigs)for decades to
> make artificial reefs. Many of these are in 
> > oligotrophic environments that should also be
> iron-limited, at least to some extent. 
> > 
> > I note that Enric Sala's blog on National Geographic
> stated that "The science team found similar black reefs in
> other coral atolls and islands in the 
> > central Pacific". So the question is, why has this
> black reef phenomenon not been found earlier in other remote
> areas that are more regularly dived (like 
> > the Caroline Islands)? Is it because iron is less
> limiting in those areas, or is there a specific suite of
> taxa in the central Pacific that exhibit a much 
> > greater response to iron input? 
> > 
> > Dr. Mark Tupper, Board of Directors
> > Coastal Resources Association
> > 16880 87 Ave., Surrey, BC, Canada V4N 5J4
> > www.coastal-resources.org
> > Email: mtupper at coastal-resources.org
> > Tel. 1-604-576-1674; Mobile: 1-604-961-2022
> > 
> > Philippines Office: c/o Ricky Mijares
> > Poblacion, Sagay, Camiguin, Philippines 9103
> > Tel. 63-927-921-9915
> > 
> > 
> > On Wed Nov 28 13:54 , John Ware  sent:
> > 
> >> 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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