[Coral-List] Bubbles from Millepora skeleton

[Douglas Fenner]

       In shallow pools with little or no circulation from outside water,
oxygen levels at night can get very low, since all aerobic organisms are
using oxygen and none are producing it.  Koweek et al (2015) found that
oxygen levels in a small back reef pool in American Samoa ranged from
32-187% of saturation during a 24 hr cycle.
      Asia to Australia has some small, thin shark species called "bamboo
sharks."  They commonly live in small, shallow, restricted pools.  They are
able to survive low levels of oxygen that would kill almost any other
vertebrate.  Their brain shuts down and they are immobile.  When oxygen
increases they come to and resume activity.
      Cheers, Doug

Koweek, D. A., Dunbar, R. E., Monismith, S. G., Mucciarone, D. A., Woodson,
C. B.,

         and Samuel, L. 2015. High-resolution physical and biogeochemical
variability

         from a shallow back reef on Ofu, American Samoa: an end-member
perspective.

         *Coral Reefs* 34: 979-991.


https://www.oceanicsociety.org/resources/ocean-facts/the-shark-that-can-walk-on-land/

On Mon, May 1, 2023 at 4:23 AM Risk, Michael via Coral-List <
coral-list at coral.aoml.noaa.gov> wrote:

>    Who, me? I've been cantankerous for lots longer then that.
>
>    Dave: I didn't realise it was paywalled-I will send a copy to your
>    email. Any anyone else who wants one.
>
>    Although the O2 may supply the critter, I can't imagine most shallow
>    orgs being O2 starved. More to the point: there is no gas in the corals
>    in the morning. It builds up all day, under influence of light. So all
>    this oxygen leaks out overnight, from the activities of boring algae.
>    Which are present in every carbonate grain, every coral skeleton.
>
>    Remember all those papers from decades ago, on reef productivity? Based
>    on gas production? And all the O2 was deemed produced by corals as they
>    grew? Well, a significant amount of the O2 was produced by destructive
>    orgs. I have never trusted those papers.
>
>    May the Millepora goddesses forgive me for all the branches I pinged
>    off. But it's great fun.
>
>    Mike
>      __________________________________________________________________
>
>    From: Coral-List <coral-list-bounces at coral.aoml.noaa.gov> on behalf of
>    David Blakeway via Coral-List <coral-list at coral.aoml.noaa.gov>
>    Sent: Friday, April 28, 2023 4:05 PM
>    To: tomascik at novuscom.net <tomascik at novuscom.net>
>    Cc: coral list <coral-list at coral.aoml.noaa.gov>
>    Subject: Re: [Coral-List] Bubbles from Millepora skeleton
>
>    Interesting, thank you Mike.
>    (No thank you to Science for locking up copyright and paywalling the
>    article).
>    Tom, in this case it was a clean white break, but I have seen that
>    green
>    layer before.  And it was in the day: late afternoon.
>    I wonder if there is any potential for this skeletal oxygen to supply
>    the
>    organism when it's running low in the early hours?
>    1892 huh? No wonder he is cantankerous.
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> References
>
>    1. https://coral.aoml.noaa.gov/mailman/listinfo/coral-list
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