[Coral-List] Coralimorph problem in Palmyra
CDelbeek at calacademy.org
Wed Apr 7 15:36:47 EDT 2010
Corallimorphs in aquaria tend to do well in water with elevated organics and phosphate in the water. It could be that these disturbances to the reef may have liberated or exposed reef structure that has resulted in the liberation of bound phosphate or increased its exposure to bacterial action. Another possibility may be that interstitial waters (usually high on P and N) in the reef rockwork were released and now are freely flowing into the nearby waters? Sort of like uncorking a bottle.
Just some random speculations! :-)
J. Charles Delbeek, M.Sc.
Senior Aquatic Biologist, Steinhart Aquarium
California Academy of Sciences
55 Music Concourse Dr.
San Francisco CA 94118
phone (415) 379-5303
fax (415) 379-5304
cdelbeek at calacademy.org
Extreme mammals take over the Academy April 3 - September 12
From: coral-list-bounces at coral.aoml.noaa.gov [mailto:coral-list-bounces at coral.aoml.noaa.gov] On Behalf Of Albert Norstrom
Sent: Wednesday, April 07, 2010 6:16 AM
To: Forest Rohwer
Cc: coral-list at coral.aoml.noaa.gov
Subject: Re: [Coral-List] Coralimorph problem in Palmyra
Hi Forest and all others,
We're currently undergoing experiments on Zanzibar to discern the
potential drivers (N,P,Fe exposure or loss of top-down control) of
corallimorph expansions. One interesting, and unexpected, observation by
my master student (who's on site) is that corallimorphs in experimental
plots on the reef were predated by a species of seastar. Communication
with her is sporadic and so I haven't received photos or any detailed
identification of the critters responsible, but I could do so as soon as
I receive more info.
Corallimorpharian dominated reefs were one of the persistent alternative
states we identified in a MEPS review from last year
Forest Rohwer wrote:
> The reef around a wreck of the longliner on Palmyra is doing really poorly.
> A coralimorph (Rhodactis) has completely taken over the area. The colonies
> cover over 80% of the benthos, independently of what was underneath. The
> concerning part is that it is spreading rapidly across the shallow western
> terrace of the island. The spread is really quick and it is starting to
> invade some of the most beautiful and intact reefs left on the island.
> Jim Maragos has an article on this:
> Ideas about how to kill the coralimorph would be greatly appreciated.
> Forest Rohwer
> Coral-List mailing list
> Coral-List at coral.aoml.noaa.gov
Albert Norström, PhD
Stockholm Resilience Centre & Albaeco
104 05 Stockholm
Tel: +46 (0)79 54 63 74
Email: albert at ecology.su.se
Sustainable development update blog: www.sdupdate.org
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