[Coral-List] White-spined Diadema antillarum (Esther Peters)
Szmant, Alina
szmanta at uncw.edu
Mon May 19 19:11:30 EDT 2008
Hi All:
I responded privately to the first white Diadema email, and thought
maybe Haris Lessios might chime in to the general discussion. Since he
hasn't here it goes.
White spined Diadema have been around as long as I can recall (1960s) in
small numbers at least in the Puerto Rican populations. After the
die-off they have become a much larger proportion of the population both
in PR and FL and elsewhere. I asked Haris at least a decade ago whether
he had any indication about a genetic difference between the white and
black individuals, and I recall he hadn't found any. But he also
recognized the shift in abundance of the two color morphs.
So, it appears that for some reason more of the white spined variety
survived the epidemic and contributed more offspring to the recovering
population. They now occur together in varying proportions. Juveniles
come in both all black and mottled colors, so it's not just an age
issue. One possibility is that when they were sick, the black ones were
more prone to predation than the lighter colored ones. Another would be
that there is some disease resistance genetically-linked to the color
genes.
Best wishes,
Alina Szmant
*******************************************************************
Dr. Alina M. Szmant
Coral Reef Research Group
UNCW-Center for Marine Science
5600 Marvin K. Moss Ln
Wilmington NC 28409
Tel: (910)962-2362 & Fax: (910)962-2410
Cell: (910)200-3913
email: szmanta at uncw.edu
Web Page: http://people.uncw.edu/szmanta
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-----Original Message-----
From: coral-list-bounces at coral.aoml.noaa.gov
[mailto:coral-list-bounces at coral.aoml.noaa.gov] On Behalf Of Rex Chip
Baumberger
Sent: Monday, May 19, 2008 1:50 PM
To: coral-list at coral.aoml.noaa.gov
Subject: Re: [Coral-List] White-spined Diadema antillarum (Esther
Peters)
I recall seeing the occasional white-spined D. antillarum during the
past 4 years of reef monitoring off of south Florida. With that in mind
from recent posts here, I was diving off of Jupiter, Fl 5-15-08 at
65-70' on Jupiter Ledge, and I saw a white spined Diadema. However, as
I got closer I noticed it was about 60% white spined and the rest normal
black spines. I wonder if anyone has noticed this in with the
white-spined variety. I have the GPS for it if anyone is interested,
the site is locally known as "Scarface".
Rex "Chip" Baumberger
Biological Scientist, FAU
Marine Nutrient Dynamics Dept.
Marine Science Division
Harbor Branch Oceanographic Inst.
5600 US1 North
Fort Pierce, FL 34946
772-465-2400 x398
-----Original Message-----
From: coral-list-bounces at coral.aoml.noaa.gov
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Subject: Coral-List Digest, Vol 59, Issue 18
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When replying, please edit your Subject line so it is more specific than
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Today's Topics:
1. Re: White-spined Diadema antillarum (Esther Peters)
2. Reef Restoration (Lee Goldman)
3. Re: Coral Reef Restoration (David Fisk)
4. photoshop trick for sat imagery (Dean Jacobson)
5. Re: Coral restoration (Medio, David)
----------------------------------------------------------------------
Message: 1
Date: Sun, 18 May 2008 12:28:58 -0400
From: Esther Peters <esther.peters at verizon.net>
Subject: Re: [Coral-List] White-spined Diadema antillarum
To: Gordon Hendler <hendler at nhm.org>
Cc: coral-list at coral.aoml.noaa.gov
Message-ID: <4830594A.4010304 at verizon.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I recall seeing large white-spined /Diadema antillarum/ in shallow water
at The Indians, rock outcroppings in the British Virgin Islands. I was
pregnant then, so could only snorkel, in 1988. I remember thinking they
must not have been affected by the mass motality because they were so
large. They might have been able to stay in the shade of the
outcroppings.
If one does a Google Scholar search on these key words "sea urchin
melanin epidermis" one finds all kinds of interesting papers on and
references to melanin production in the epidermis and effects of light
and diet on pigmentation in these animals. But more studies are needed!
Esther Peters, Ph.D.
George Mason University
Gordon Hendler wrote:
> According to Moore (1966:81) large Diadema antillarum with some or
> many
> white or gray spines "...are found in darker and more turbid
conditions and
> frequently in caves. In my experience, they seem to be more common in
deep
> water around Caribbean reefs than at shallow depths. The spines of
> juveniles are always banded with black and white. Individuals change
color
> in response to the intensity of illumination. Animals that are black
during
> the day pale at night.
> Hendler et al. 1995. Sea Stars, Sea Urchins, and Allies. Echinoderms
of
> Florida and the Caribbean. Smithsonian Institution Press. 390 pp.
> Moore, H.B. Ecology of echinoids. In: Physiology of Echinodermata, ed.
R.A.
> Boolootian, 73-85. John-Wiley Interscience. N.Y.
>
>
> ********************************************
> Gordon Hendler, Ph.D.
> Curator of Echinoderms
> Natural History Museum of Los Angeles County
> 900 Exposition Boulevard
> Los Angeles, California 90007 U.S.A.
> Voice: 213 763 3526
> Fax: 213 746 2999
> ********************************************
>
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>
------------------------------
Message: 2
Date: Sun, 18 May 2008 10:43:14 -0700 (PDT)
From: Lee Goldman <coralfarmguam at yahoo.com>
Subject: [Coral-List] Reef Restoration
To: coral-list at coral.aoml.noaa.gov
Message-ID: <86461.29273.qm at web33206.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Hi List,
The discussion on reef restoration is another example of a great topic
of interest for this list. My concern, however, is that it is reaching
an audience that is not necessarily the right audience. Todd, your
website (and your CNN interview) is filled with success stories in which
you talk about positive reef restoration. In your postings here, you
seem to understand that reefs cannot be restored to their original
glory. I agree that something must be done, even if we can't make them
what they were. BUT to the developers and polluters who ultimately cause
need for this work, the message may be that we are successful in
restoring reefs. Thus mitigating 'restoration' in exchange for
development appears to be a commonplace and accepted. So the dilema, to
me, is that as we get better (or think we get better) at 'restoration'
developers use that as a means to mitigate potential damage...and all
along we agree, at least here in this like-minded and for lack of a
better term, 'in-crowd' list-serve, that it really isn't as successful
as we promote it to be to the general public (the audience that really
needs to be a part of this discussion). If this is the theme of Don's
postings, then I have to agree with him as well. Solutions to this
issue? Not that I can find. We can't do nothing yet anything that is
done is seen as a mitigating factor which falls well short of the
ultimate goal.
Lee Goldman
Coral Farm Guam
PO Box 6682
Tamuning, Guam 96931
671-646-6744
Coralfarmguam at yahoo.com
------------------------------
Message: 3
Date: Sun, 18 May 2008 23:09:12 +0200
From: "David Fisk" <davefisk at gmail.com>
Subject: Re: [Coral-List] Coral Reef Restoration
To: coral-list at coral.aoml.noaa.gov
Cc: MedioD at halcrow.com
Message-ID:
<1dd51780805181409p2a8c963fx65cd87f283c93351 at mail.gmail.com>
Content-Type: text/plain; charset=WINDOWS-1252
The pertinent point I think from David Medio's comments is that it is
wrong to think that reef restoration can be used as an excuse to allow
some developments to proceed - at all, or in a certain proposed manner.
The argument that doing something (restoration) is better than doing
nothing, usually does not stack up when it is used as an argument to
accept a proposed development strategy. With the required sensitivity
and developmental controls, some developments may result in minimal
impacts, but the cost will usually be too prohibitive to be really
effective for most developments.
The true 'point of practicality' here is that restoration should not be
be used as that offset, nor should any 'smart' engineering per se, as
it's too easy to let serious impacts to go ahead when the current
knowledge base clearly shows such 'offsets' will not deliver what it is
promised. In previous posts I have said sufficient re the use of the
same technologies to reverse larger scale disturbances including
predicted climate change effects, but I still hear of proposals claiming
to do just that. For example, a publicly available UN document dated
April 2008 demonstrates how serious this situation has progressed, and
that I am not making idle arguments. Here is a recent UN link to a
UNDESA document called "Partnerships for Sustainable Develoment" which
may very well lead to substantial funding for certain restoration
projects:
http://webapps01.un.org/dsd/partnerships/public/partnerships/1894.html
In this web page the following statement is included (and note some of
the extreme statements) : "SIDS (Small Island Developing States)
fisheries, tourism industries, and protection from rising sea levels,
increased tropical storm frequency and intensity are heavily dependent
on healthy coral reefs?and these are the most climatically threatened of
all ecosystems, due to global warming. SIDS have already lost most of
their corals, and the rest are imminently endangered by rising global
temperatures, and most daunting of all, low-lying island nations are
threatened with extinction by submergence from global sea level rise."
Further on under the heading: Additional Relevant Information - New
Sustainable Development for SIDS - CORAL REEF AND FISHERIES HABITAT
RESTORATION "New technology increases the growth rates of corals several
times faster than normal, greatly increases survival of corals under
conditions of extreme high temperature stress, and greatly increases the
buildup of fish and shellfish populations. This allows reefs to be kept
alive where they would die, and new reefs and fisheries habitat to be
grown in a few years in places where they cannot recover naturally.
Because reef fisheries are collapsing due to habitat destruction,
control of fishing activities cannot restore fisheries without
large-scale habitat restoration. This restoration process is powered
using tidal, solar, and wind energy. "
As this information is in the public domain it is imperative that the
coral reef community is adequately informed of this as a means of
placing this discussion in a contemporary framework. Again, I apologize
if any individual is compromised by pointing out this trend - I am just
the messenger, and am not targeting anyone in particular. But I think it
is time that the wider coral reef community step up and insist on proper
scientific review and do not let commercial interests within the
scientific community drive this assessment of the allocation of critical
development funding for SIDS in particular.
David Fisk
------------------------------
Message: 4
Date: Mon, 19 May 2008 00:27:51 -0700 (PDT)
From: Dean Jacobson <atolldino at yahoo.com>
Subject: [Coral-List] photoshop trick for sat imagery
To: coral-list at coral.aoml.noaa.gov
Cc: Don Hess <cmihess at gmail.com>
Message-ID: <287849.35766.qm at web31803.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Hi listers:
Today I "discovered" a useful way to filter satellite images using
Photoshop to reveals relatively deep reefs (below 15 meters). (I am
fortunate to have access to 0.6 m Majuro atoll data for ArcMap). I am
using Photoshop 6.
Under "images", choose selective color, choose blue, then minimize the
black slider. Then choose black, and maximize black slider. Another
iteration may be needed. Then, increase contrast and brightness. To
avoid blowing out the shallows and land, first save an extra image
layer, make your adjustments, and then selectively erase the upper
adjustment layer so the original pixels show through.
The results were pretty remarkable; it was like having "X-ray vision"...
well-defined deep reefs magically appeared out of the monotonous dark
blue lagoon water. This will work only if the stat image was taken an a
calm day; a wave chop seems to obscure the deep features.
I discovered this just in time for my coral monitoring season! I can
send some example jpgs upon request.
Cheers,
Dean Jacobson, PhD
College of the Marshall Islands
------------------------------
Message: 5
Date: Mon, 19 May 2008 09:17:42 +0100
From: "Medio, David" <MedioD at halcrow.com>
Subject: Re: [Coral-List] Coral restoration
To: "Douglas Fenner" <dfenner at blueskynet.as>
Cc: coral-list at coral.aoml.noaa.gov
Message-ID:
<A87990669172924FADCAABF1721CB6EC0878E991 at LOND-MX-01.halcrow.com>
Content-Type: text/plain; charset="us-ascii"
Doug
apologies! It is indeed the Arabian Gulf (Persian to some) I am
referring to!
David
Dr David Medio
Principal Environmental Scientist
Halcrow Group Ltd, Arndale Centre, Otley Rd, Headingley, Leeds, LS6 2UL,
UK
tel: switchboard +44 (0)113 2208220, direct line: +44 (0)113 220 8253,
mobile: +44 (0)773 919 0968
fax: +44 (0)113 274 2924 email: mediod at halcrow.com
www.halcrow.com
________________________________________________________________________
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Halcrow Sustaining and improving the quality of people's lives
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P Please do not print this e-mail and attachments unless absolutely
necessary
-----Original Message-----
From: Douglas Fenner [mailto:dfenner at blueskynet.as]
Sent: 18 May 2008 00:18
To: Medio, David
Subject: Re: [Coral-List] Coral restoration
Dave,
Are you speaking of the Arbian/Persian Gulf? I know its common to
refer to it as the Gulf in that area. The coral-list has many readers
that are closer to the Gulf of Mexico, some near the Gulf of California,
and so on.
Might be good to specify so no one is left wondering. Thanks! -Doug
----- Original Message -----
From: "Medio, David" <MedioD at halcrow.com>
To: <coral-list at coral.aoml.noaa.gov>
Sent: Friday, May 16, 2008 2:13 AM
Subject: [Coral-List] Coral restoration
>I am involved in a wide range of medium to very large coastal
developments
>some of which a priori are known to damage long established reefs in
the
>Gulf. Whereas some of the recent artificial reef applications may well
have
>had positive results, I am as rule very sceptical on the use of and
>proliferaion as well as the political clout afforded artificial reef
>initiatives.
>
> Firstly, can we really recreate a reef (as opposed to relocating
existing
> bits of a reef) in its complexity, function and extent?
>
> Secondly, using man made reefs, if pushed to the limit, as is the case
in
> many coastal and offshore developments in the Gulf, will amount
frequently
> to giving a green light to using such as a tool to offset large levels
of
> multi-layered damage to the marine environment, i.e. more than just
the
> coral habitats.
>
> Reefs in the Gulf are increasingly being described as far more
extensive
> and pristine and species rich than previuosly thought whilst at the
same
> coming under the greatest level of pressure ever experienced in the
> region.
>
> The answer for their conservation is cleverly designed engineering,
robust
> and well implemented mitigation measures and environmental management
> plans, improved environmental educational and awareness and improved
> regulatory frameworks.
>
>
> Dr David Medio
> Principal Environmental Scientist
> Halcrow Group Ltd, Arndale Centre, Otley Rd, Headingley, Leeds, LS6
2UL,
> UK
> tel: switchboard +44 (0)113 2208220, direct line: +44 (0)113 220 8253,
> mobile: +44 (0)773 919 0968
> fax: +44 (0)113 274 2924 email: mediod at halcrow.com
> www.halcrow.com
>
________________________________________________________________________
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>
> Halcrow Sustaining and improving the quality of people's lives
>
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