[Coral-List] Return of diadema helped reefs? (Pam Hallock-Muller)
Josh Idjadi
jidjadi at neaq.org
Fri Jun 12 12:15:38 EDT 2009
There is an inverse relationship between Diadema density and size and
Diadema can reduce their skeletal body size at high densities (see
reference below). The urchins you're seeing are likely to be larger than
the pre die-off urchins. Glad to hear they're there as we have strong
evidence that, on balance, their presence and the accompanying community
changes increase coral growth and survivorship.
Levitan 1988. Density-dependent size regulation and negative growth in
the sea urchin Diadema antillarum Philippi
http://www.springerlink.com/content/w74t3n6725g0hm87/
Joshua A. Idjadi, Ph.D.
Edgerton Research Laboratory
New England Aquarium
Office (617) 973-5231
Fax (617) 723-6207
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Today's Topics:
1. Re: Return of diadema helped reefs? (Pam Hallock-Muller)
2. coral planula dispersal data for Caribbean (Brad Baldwin)
3. Fellowship Announcement for Coral Reef Ecosystem Research
(Andrew Baird)
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Message: 1
Date: Thu, 11 Jun 2009 11:12:46 -0400
From: Pam Hallock-Muller <pmuller at marine.usf.edu>
Subject: Re: [Coral-List] Return of diadema helped reefs?
To: Ed Blume <edblume at mailbag.com>
Cc: coral-list at coral.aoml.noaa.gov
Message-ID: <4A311EEE.7070104 at marine.usf.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I made a couple of dives on May 24 in Puerto Rico off San Juan (a spot
called the Trolley's Last Stop, if I recall correctly), and the Diadema
were large, abundant, and the macroalgae seemed pretty well under
control. The depth range was mostly ~5-12 m. The coral cover looked
pretty good, though I only saw 2 Acropora colonies total (one each A.
palmata and A cervicornis, both small). I took some pictures of the
array of diseases that I noticed, if anyone is interested; they were
taken with a "point and shoot", so they are not professional quality.
PHM
Pamela Hallock Muller, Ph.D., Professor
College of Marine Science
University of South Florida
140 Seventh Ave. S.
St.Petersburg, FL 33701-5016
Phone: 727-553-1567
FAX: 727-553-1189
e-mail: pmuller at marine.usf.edu
Website: http://www.marine.usf.edu/reefslab
Ed Blume wrote:
> Recently snorkeling in Akumal Bay, Mexico, I was diadema the size of
> basketball. Have their return improved coral health anywhere in the
> Caribbean. It hasn't in Akumal Bay, which is under assault in many
ways.
>
> Ed Blume
> Communications/Outreach
> RENEW Wisconsin
> 222 S. Hamilton St.
> Madison, WI 53703
> 608.819.0748
> Home page: http://www.renewwisconsin.org
> RENEW Wisconsin Blog: http://www.renewwisconsinblog.org
> Milwaukee Renewable Energy Blog:
> http://renewableenergymilwaukee.blogspot.com
> Madison Peak Oil Group Blog:
http://www.madisonpeakoil-blog.blogspot.com
> Skype: edblume
>
>
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