[Coral-List] unusual bleaching Coral-List Digest, Vol 14, Issue 9 (Dominique McCowan)
Reza Shokri
shokri.mr at gmail.com
Sat Oct 17 04:48:46 EDT 2009
Dear *Dominique,*
The last bleaching occurred in June 2009, in a lesser extent again in the
mentioned resistant species. Corals transplanted from Shahhid Behehsti Port
about 4 km down from their new home in the Chahbahar Bay. Corals are under
serious danger of extinction due to the direct loss of their habitat caused
by reclamation works for the development of Shahid Beheshti Port.
Surprisingly the transplanted corals were under terrible condition in their
original home (i.e. high turbid water and high temperature due to
reclamation and partial enclosure of the port), so I expected to see them
become bleached after transplantation, but they did not. Yet the remaining
Acropora corals in their original home were not bleached even under terrible
conditions. There are minor differences in water quality between locations;
the new home is away from reclamation work so it offers better conditions to
corals.
Your point on the higher energy reserves in the transplants, or being in the
history of exposure to stress, made me thinking that recollected corals may
have coped themselves to stresses and have become more resistant to
bleaching.
The scenario of the effect of previous short bleaching can also be a reason
for my observation, however no bleaching data is available to argue on this.
*Cheers
Reza*
On Tue, Oct 13, 2009 at 7:30 PM, <coral-list-request at coral.aoml.noaa.gov>wrote:
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> Today's Topics:
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> 1. Unusual coral bleaching on the coast of south?east Iranian
> Baluchistan (Reza Shokri) (Eugene Shinn)
> 2. Re: unusual bleaching Coral-List Digest, Vol 14, Issue 9
> (Dominique McCowan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 12 Oct 2009 11:50:52 -0400
> From: Eugene Shinn <eshinn at marine.usf.edu>
> Subject: [Coral-List] Unusual coral bleaching on the coast of
> south?east Iranian Baluchistan (Reza Shokri)
> To: coral-list at coral.aoml.noaa.gov
> Message-ID: <a06230915c6f90087fd7b@[131.247.137.127]>
> Content-Type: text/plain; charset="us-ascii" ; format="flowed"
>
> Dear Reza, That is a very interesting observation that I can not
> answer. It Shows how little we really know about bleaching. Gene
> --
>
>
> No Rocks, No Water, No Ecosystem (EAS)
> ------------------------------------ -----------------------------------
> E. A. Shinn, Courtesy Professor
> University of South Florida
> Marine Science Center (room 204)
> 140 Seventh Avenue South
> St. Petersburg, FL 33701
> <eshinn at marine.usf.edu>
> Tel 727 553-1158----------------------------------
> -----------------------------------
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 13 Oct 2009 13:30:05 +1000
> From: Dominique McCowan <dmmccowa at gmail.com>
> Subject: Re: [Coral-List] unusual bleaching Coral-List Digest, Vol 14,
> Issue 9
> To: coral-list at coral.aoml.noaa.gov
> Message-ID:
> <674c7c460910122030y61b46642n9382f71361f1b5ce at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi listers,
>
> This is in response to Reza Shokri and the unusual bleaching. Firstly, the
> families themselves are more resistant; however, there are species within
> the families that are more susceptible, with that being said...
> Your question made me have questions of my own. For instance, when was the
> last bleaching? Usually the more resistant corals show prolonged bleaching
> responses, while the susceptible ones bleach and begin recovery. If there
> was a short interval between bleaching events, it is likely that the
> resistant corals were still feeling the effects of the previous event,
> while
> the susceptible ones were not (i.e. Moothien-Pillay *et al.* 2006).
> Another
> question, where were the corals transplanted from, somewhere that usually
> has higher temperatures? If this were the case, then their thermal
> threshold was not reached (or it could be that the symbiont type is
> different from the native corals). Are there differences in water quality
> between the locations? The transplants may have higher energy reserves, or
> their could be a difference in the history of exposure to stress, which
> would cause the transplants to be more resistant.
> Another possibility (though I'm stretching on this one), if you have
> previous bleaching data for the location, is that the events were of a
> short
> duration which may have caused loss of susceptible corals before resistant
> corals bleached. This would enable the left-over "susceptible" species to
> be more tolerant (for one reason or another) while the resistant species
> which had not experienced bleaching were the susceptible corals of these
> species.
> There are also several smaller scale possibilities, such as shading, water
> flow, water depth, etc.
> Please let me know if any of these scenarios are feasible, very curious.
>
> Cheers,
> Dominique McCowan
> --
> PhD Candidate
> ARC Centre of Excellence for Coral Reef Studies
> James Cook University
> Townsville, QLD 4811 Australia
>
> Room 108
> Sir George Fisher Research Building
> Phone: 07 4781 6063
> E-mail: dmmccowa at gmail.com
>
> ARC Centre of Excellence for Coral Reef Studies
> http://www.coralcoe.org.au/
> On Tue, Oct 13, 2009 at 2:00 AM, <coral-list-request at coral.aoml.noaa.gov
> >wrote:
>
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> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Coral-List digest..."
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> >
> > Today's Topics:
> >
> > 1. Unusual coral bleaching on the coast of south?east Iranian
> > Baluchistan (Reza Shokri)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sun, 11 Oct 2009 09:25:48 +0330
> > From: Reza Shokri <shokri.mr at gmail.com>
> > Subject: [Coral-List] Unusual coral bleaching on the coast of
> > south?east Iranian Baluchistan
> > To: coral-list at coral.aoml.noaa.gov
> > Message-ID:
> > <5156a49c0910102255k3743f60x263a49ec5890cbf7 at mail.gmail.com>
> > Content-Type: text/plain; charset=UTF-8
> >
> > Dear coral listers,
> >
> >
> >
> > I ?d like to inform you of an unusual bleaching I observed in Chahbahar
> > Bay,
> > on the coast of south?east Iranian Baluchistan, Oman Sea. I call this as
> > unusual bleaching because all bleached corals were of massive Favia, to
> > some
> > extant Porites and Montastrea species and some soft coral. Non of newly
> > relocated (6 months) and transplanted Acropora and *Pocillopora** *corals
> > were bleached. I am wondering why stress-toleartor corals were bleached
> > while non of ruderals corals were not.
> >
> >
> > Best regards,
> >
> > Reza
> >
> >
> >
> >
> > --
> > Mohammad Reza Shokri (PhD)
> > Assistant Professor
> > Marine Conservation Biologist
> > Faculty of Biological Sciences
> > Shahid Beheshti University
> > Zip Code:1983963113
> > Evin, Tehran, I.R. Iran
> > Phone: +98-21-2990 2723
> > Fax: +98-21-2243 1664
> > Cell: 0912 409 7464
> > E-mail: shokri.mr at gmail.com
> >
> >
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> > End of Coral-List Digest, Vol 14, Issue 9
> > *****************************************
> >
>
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--
Mohammad Reza Shokri (PhD)
Assistant Professor
Marine Conservation Biologist
Faculty of Biological Sciences
Shahid Beheshti University
Zip Code:1983963113
Evin, Tehran, I.R. Iran
Phone: +98-21-2990 2723
Fax: +98-21-2243 1664
Cell: 0912 409 7464
E-mail: shokri.mr at gmail.com
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