[Coral-List] coral spawning in the Florida Keys
Howard R. Lasker
hlasker at buffalo.edu
Tue Aug 17 14:15:06 EDT 2004
Mark and company have provided some great information, but I would like
to make one amendment to the report so that it does not become a
citation that Plexaura flexuosa is a brooder.
The elongate objects that Mark reports being released by gorgonians were
probably eggs. Plexaura flexuosa is a gonochoric, broadcast spawner
(Beiring, EA, & Lasker, HR, 2000, Mar Ecol Prog Ser 196:169-177). In
other species, I have observed eggs released with a long thin form which
to the eye look like planulae. They revert to spheres once they are in
the water column, and when examined under magnification are invariably
eggs.
The same is probably true for the unidentified Eunicea, as all of the
plexaurids examined to date have been broadcast spawners and the only
Eunicea sp. that I have observed spawn was releasing eggs. Brooding is
known among some gorgonaceans but is not known in plexaurids, nor in any
of the Caribbean species. There are some species in other families in
the Caribbean that surface brood (i.e. Briareum asbestinum,
Pseudopterogorgia elisabethae and P. bipinnata).
I have add the caveat that I wasn't there for this spawning event -- but
I would be very surprised if they were planulae.
Cheers,
Howard Lasker
Mark Vermeij wrote:
>Dear List,
>
>
>Saturday August 7: Earlier
>the same night (around 22h00) mearly all gorgonians of the species
>Plexaura flexuosa and a Eunicea sp. were observed releasing what
>looked like 1mm long planulae/embryo's.
>
>
>
>____________________________________________________
>
>
>Dr. M. Vermeij
>Cooperative Institute for Marine and Atmospheric Studies (CIMAS)
>Rosenstiel School for Marine and Atmospheric Science (RSMAS,
>University of Miami)
>NOAA Southeast Science Fisheries Center
>75 Virginia Beach Dr
>Miami, FL 33149 U.S.A.
>
>mark.vermeij at noaa.gov
>tel +1 305 3614230
>tel +1 305 3614609
>fax +1 305 3614499
>
>_______________________________________________
>Coral-List mailing list
>Coral-List at coral.aoml.noaa.gov
>http://coral.aoml.noaa.gov/mailman/listinfo/coral-list
>
>
--
*****************************************************************
Howard R. Lasker
Professor
Department of Biological Sciences
635 Hochstetter Hall
University at Buffalo (State University of New York at Buffalo)
Buffalo, NY 14260
phone: (716) 645-2363 x 184
fax: (716) 645-2975
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