[Coral-List] Michael Risk - C. delitrix as measure of bioerosion

Richard Grigg rgrigg at soest.hawaii.edu
Tue Oct 17 16:32:55 EDT 2006


         Clionid sponges and bivalves, in the main, set the depth limit for 
reef accretion for reefs in the SE Hawaiian Islands.  See Depth limit for 
reef building corals in the Au'au Channel, S.E. Hawaii, in Coral Reefs, 
25:77-84, 2006.

                                         Richard Grigg

At 02:23 PM 10/17/2006 +0200, Christine Schoenberg wrote:
>Dear Gregor and other Corallisters,
>I have been following the discussion on bioerosion and bioeroding
>sponges with increasing interest. I have been looking into the
>nutrients/bioerosion question since about 1995 and have some (unpubl.)
>experimental results that point the same way as results from Mike Risk's
>group. Klaus Ruetzler from the Smithsonian in Washington noted increases
>in bioeroding sponge abundances in the Caribbean (Rutzler K 2002. Impact
>of crustose clionid sponges on Caribbean reef corals. Acta Geol
>Hispanica 37: 61-72). I have some more recent data on increased
>bioeroding sponge abundances on the Great Barrier Reef that I am
>presently trying to publish. I was quite impressed by these data and
>think it would be extremely important to obtain some more large-scale,
>long-term knowledge about all this, especially as I had some reports
>from non-sponge people who contacted me about possibly bioeroding
>sponges that seem to become epidemic at their sites (yet unconfirmed but
>not unlikely).
>Since some time I have been trying to find some people who are able to
>conduct a quick monitoring project on bioeroding sponges in different
>parts of the world, repeated over an extended period of time, going to
>their own field sites maybe twice a year for a day or two to collect
>related data. Either following a simplified Holmes-protocol (see Holmes,
>KE 2000. Effects of eutrophication on bioeroding sponge communities with
>the description of new West Indian sponges, Cliona spp. (Porifera:
>Hadromerida: Clionidae). Invertebrate Biology, 119, 125­138 and Holmes,
>KE, Edinger, EN, Hariyadi, Limmon, GV & Risk, MJ 2000. Bioerosion of
>live massive corals and branching coral rubble on Indonesian coral
>reefs. Marine Pollution Bulletin, 40, 606­617) or some sort of simple
>transect study quantifying the 'top predators' in sponge bioerosion.
>Participants in this project need to be familiar with bioeroding
>sponges, i.e. need to be able to distinguish all bioeroding sponge
>species as in 'no. 1 differs from no. 2' (Holmes-approach) or to
>identify the 2 or 3 the most common species at their sites. So far I
>thought it would probably be better to involve sponge people who are
>experienced with the more important sponges, e.g. of the Cliona viridis
>species complex (very competitive, brown, symbiotic sponges, including
>species such as aprica, caribbaea, nigricans, papillae, tenuis,
>vallartense, varians, viridis) and maybe with the Cliona celata species
>complex (very common, including e.g. alderi, amplicalvata, californiana,
>celata, dissimilis, linearis, raphida), but maybe some coral people who
>are often in the field would be just as good. In the Caribbean Cliona
>delitrix needs to be included, and maybe Pione lampa. Anyone interested?
>Cheers, Christine
>On Tuesday, October 17, 2006, at 04:48 , Gregor Hodgson wrote:
> > Mike has long suggested the use of boring sponges as a useful/simple
> > technique for estimating one component of reef health. We are always
> > open to
> > good suggestions and this idea is appealing, however, our initial tests
> > did
> > not support the theory. To be useful to us, this indicator needs to
> > work at
> > least regionally if not globally. But we have not given it a rigorous
> > test.
> >
> > We would be very pleased if Mike (or supporter) would suggest a
> > volunteer
> > level protocol and then if teams around the world might give it a test
> > to
> > see if it holds up as an indicator on a wide geographic scale.
> >
> > Best,
> > Greg
> >
> > Gregor Hodgson, PhD
> > Executive Director, Reef Check Foundation
> > P.O. Box 1057 (mail)
> > 17575 Pacific Coast Highway (Fedex)
> > Pacific Palisades, CA 90272-1057
> > Tel: +1-310-230-2371 Fax: +1-310-230-2376
> > email: gregorh at reefcheck.org
> > www.ReefCheck.org
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> > *************************************************
>Dr. Christine Schoenberg
>Carl von Ossietzky Universitaet Oldenburg
>Fakultaet 5
>Institut fuer Biologie und Umweltwissenschaften
>AG Zoosystematik und Morphologie
>26111 Oldenburg
>ph +49 (0)441 798 3611
>fax +49 (0)441 798 3250
>(alternative email:  christineaway at gmx.net )
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