[Coral-List] intensive coral colors at onset of bleaching?

Tue Sep 7 14:09:11 EDT 2010

Dear Coral-Listers, 

We are delighted about the interest in reprints of the paper on the light-regulation of fluorescent proteins. Please note that the publication can be downloaded for free from the MEPS page: http://www.int-res.com/articles/meps_oa/m364p097.pdf

Regards,

Cecilia D’Angelo and Joerg Wiedenmann 

-------- Original-Nachricht --------
> Datum: Fri, 03 Sep 2010 17:35:06 +0200
> Von: "Cecilia DAngelo" <cdangelo at gmx.de>
> An: sferse at AOL.com, sebastian.ferse at zmt-bremen.de
> CC: coral-list at coral.aoml.noaa.gov
> Betreff: Re: [Coral-List] intensive coral colors at onset of bleaching?

> Dear Sebastian, 
> 
> in several reef corals, an up-regulation of GFP-like fluorescent and
> non-fluorescent proteins (responsible for the "neon colors") is associated with
> an increase in light intensity. This up regulation can be measured at the
> transcriptional level already after two hours and is strongest in response
> to the blue part of the spectrum (D’Angelo et al 2008).  In the field,
> this effect can be nicely demonstrated by the increased fluorescence / color
> in the upper branch sides of many Acropora species (observations from the
> Great Barrier Reef and the Red Sea).  Especially in several table acroporas,
> the fluorescence is restricted to the upper side of the colony. 
>  
> As increased light levels can act synergistically with high temperatures
> (and other factors) to induce coral bleaching, the observation of increased
> fluorescence ahead of bleach might be indicative of light stress, for
> instance due to calm water conditions. It is important to note, though,  that
> not all corals and all GFP-like proteins respond the same way. Some pigments
> of Acropora millepora are downregulated at photonfluxes beyond 400
> micromol/m2/s (D’Angelo et al., 2008) and the tissue concentrations of
> fluorescent pigments of other corals like Montastrea cavernosa do not respond at all
> to changes between medium and high light levels (Leutenegger et al., 2007).
> Interestingly, the visibility of the host pigments in this species can be
> enhanced when the tissue content of zooxanthellae is reduced under high
> light conditions (D’Angelo & Wiedenmann, in press). 
> 
> Taken together, there are potential explanations for the increase in
> colors observed ahead of bleaching. However, it would need some specific
> measurements to elucidate this particular case as also other factors might
> stimulate the production of fluorescent pigments.
> 
> Best wishes,
> 
> Joerg Wiedenmann
> 
> Cecilia D’Angelo
> 
> 
> D’Angelo, C.; Denzel, A.; Vogt, A.; Matz M. V.; Oswald, F.; Salih, A.;
> Nienhaus, G.-U. & Wiedenmann, J. (2008). Blue light regulation of host
> pigment in reef-building corals. Mar. Ecol. Prog. Ser. 364, 97-106.
> 
> Leutenegger, A., D’Angelo, C., Matz, M.V., Denzel, A., Oswald, F.,
> Salih, A., Nienhaus, G.U. & Wiedenmann, J. (2007). It’s cheap to be colorful:
> Anthozoans show a slow turnover of GFP-like proteins. FEBS Journal, 274,
> 2496–2505. 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> PD Dr. Joerg Wiedenmann
> National Oceanography Centre, Southampton    
> University of Southampton, Waterfront Campus
> European Way,  Southampton SO14 3ZH, UK 
> http://www.noc.soton.ac.uk/corals/
> http://www.carnuk.org/about.aspx
> joerg.wiedenmann at noc.soton.ac.uk
> 
> Dr. Cecilia D’Angelo,
> Institute for General Zoology,
> University of Ulm,
> 89069 Ulm
> Germany
> C.D'angelo at soton.ac.uk
> 
> 
> 
> > 
> > On Sep 1, 2010, at 5:18 AM, Sebastian Ferse wrote:
> > 
> > > Dear listers,
> > >
> > >
> > >
> > > An acquaintance has passed on a report from a dive resort owner in  
> > > Malaysia,
> > > who observed that prior to each bleaching event all corals underwent a
> > > spectacular color change, displaying bright neon colors. I am  
> > > assuming that
> > > this is due to the higher amount of color pigments in the tissue  
> > > relative to
> > > zooxanthellae, and possibly due to a stress response triggering higher
> > > pigment production. Does anyone have further insights or own  
> > > observations on
> > > this?
> > >
> > >
> > >
> > > Cheers
> > >
> > >
> > >
> > > Sebastian
> > >
> > >
> > >
> > > _________________________
> > > Dr. Sebastian Ferse
> > >
> > >
> > > Leibniz-Zentrum für Marine Tropenökologie (ZMT) GmbH
> > > Leibniz Center for Tropical Marine Ecology
> > > Fahrenheitstrasse 6
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> > >
> > > Phone: +49-421-238 00 28
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> > > e-mail: sebastian.ferse at zmt-bremen.de
> > >
> > >
> >
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