[Coral-List] Origin of Corals?
mel at briscoe.com
Tue Dec 15 21:27:31 UTC 2020
Thanks for this, Doug. I guess no one else wants to weigh in! It also seems
like no one wants to apply a little critical thinking to some of those
dozen theories. For example, your last paragraph mentions a "vortex
theory." If it has been assessed, and discarded, I'm not surprised. The
life times of coral eggs/sperm drifting across the Pacific are much shorter
than the time it takes to get there. I can only see the abstract, but the
methodology is not compelling.
On Sat, Dec 12, 2020 at 4:39 PM Douglas Fenner <douglasfennertassi at gmail.com>
> There are about a dozen theories for the marine biogeographic pattern with
> the center of diversity in the Coral Triangle. I'm not up on the current
> state of this, so I'll let others speak to it and will be interested in
> what they say. However, it just so happens that Science just published an
> article that appears to me to be relevant, even though it is about birds
> and not corals.
> Diversity hotspots: coldspots of speciation?
> The evolution of a tropical biodiversity hotspot
> I believe that this is the opposite pattern to have been reported in the
> first publication to report the diversity pattern for corals (at the genus
> level), Stehli and Wells, 1971. They reported that coral genera in
> high-diversity areas were younger than in lower diversity areas.
> Theories of why corals show this pattern have been very difficult to
> test. Veron 2000 shows the current map for coral species, genera, and
> families, might also be on his website, www.coralsoftheworld.org Fish
> show the same pattern as shown in Figure 14-11 on page 308 in Goldberg's
> text on coral reefs, based on data from Gerry Allen. Chuck Birkeland
> pointed out that echinoderms show a similar pattern, in his 1989 book
> chapter on "The influence of echinoderms on coral-reef communities." He
> shows in his Table 1 the data for each class of echinoderms separately, at
> 10 locations, a very strong pattern for every class. Take a look at this
> chapter, it is an education on echinoderms on reefs.
> One interesting idea was that of the "vortex model", that westward flowing
> currents in the Pacific carried newly evolved coral species westward,
> causing them to accumulate in the western Pacific area of highest
> diversity. Jokeil & Martinelli, 1992. There was also a similar study that
> modeled the effect of the large number of islands and reefs concentrated in
> the western Pacific vs the very sparse reefs in the eastern Pacific, and
> reported that was sufficient to produce the pattern on its own as well. I
> never found that publication, does anybody know it?
> Cheers, Doug
> Birkeland 1989. The influence of echinoderms on coral-reef communities.
> Goldberg. 2013. The biology of reefs and reef organisms. Univ
> Chicago Press
> Jokiel & Martinelli. 1992. The vortex model of coral reef biogeography.
> Journal of Biogeography.
> Stehli and Wells. 1971. Diversity and age patterns in hermatypic
> On Sat, Dec 12, 2020 at 6:44 AM Melbourne Briscoe via Coral-List <
> coral-list at coral.aoml.noaa.gov> wrote:
>> What is the currently accepted theory for the global distribution of
>> Is it still the "spreading from the epicenter in the Coral Triangle" as I
>> learned many years ago or is there a more accepted idea today?
>> thanks -
>> - Mel Briscoe
>> Coral-List mailing list
>> Coral-List at coral.aoml.noaa.gov
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