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  #1  
Old 06-19-2007, 08:05 PM
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mesocosm mesocosm 目前離線
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Default Energy and Nutrient Fluxes Regulates Symbiosis between Zooxanthellae and Corals

Greetings All !


As folks discuss metal halides, T5s, and ZEOvit online, I'm surprised that no one references this one ...


Quote:
Ratio of energy and nutrient fluxes regulates symbiosis between zooxanthellae and corals.
Dubinsky, Z; Jokiel, PL
Pacific Science [PAC. SCI.]. Vol. 48, no. 3, pp. 313-324. 1994.

Ambient irradiance levels determine the rate of carbon influx into zooxanthellae at any given time, and thereby the energy available for the whole coral symbiotic association. Long-term photoacclimation of zooxanthellae to the time-averaged light regime at which the host coral grows results in optimization of light harvesting and utilization. Under high irradiance light harvesting is reduced, thereby avoiding photodynamic damage, whereas under low light, photon capture and quantum yield are maximized. Most of the photosynthate produced by the algae is respired. However, the capability of the zooxanthellae and the coral to retain carbon beyond that required to meet their respiratory needs depends on the availability of the commonly limiting nutrients, nitrogen and phosphorus. Therefore, the ratio of the flux of these nutrients into the colony to that of the photosynthetically driven carbon flux will regulate the growth of the zooxanthellae and of the animal. Nutrients acquired by predation of the coral on zooplankton are available first to the animal, whereas those absorbed by the zooxanthellae from seawater as inorganic compounds lead first to growth of the algae.

Credit to solbby for posting this one here back in 2006:
http://www.manhattanreefs.com/forum/...aquariums.html


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  #2  
Old 06-19-2007, 09:46 PM
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if only you could trans late this stuff to english.. lol i thing im going to go to college just for marine bio. that way i can understand this stuff.
  #3  
Old 06-20-2007, 08:09 AM
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Quote:
Originally Posted by magnoliarichj
... i thing im going to go to college just for marine bio. that way i can understand this stuff.
Hehe ... IME, marine biologists are typically less than stellar reefkeepers ...



Quote:
Originally Posted by magnoliarichj
if only you could trans late this stuff to english ...
I prefer to let the articles speak for themselves. Even so, this abstract is so information-rich that I'll take a stab at it ...


Quote:
... Most of the photosynthate produced by the algae is respired. ...
mesocosm translation:
Most of the chemical products produced by the photosynthetic activity of the zooxanthellae is used by the coral for respiration. Respiration is the physical and chemical processes by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions (any of various energy-yielding oxidative reactions in living matter).

mesocosm opinion:
This concept is critical to those who are attempting to manipulate zooxanthellae density and photochemical behavior within coral tissue (whether they're using ZEOvit or not). If you're going to lower photosynthate production by either decreasing the number or zooxanthellae, or, by limiting the availability of nutrients to zooxanthellae (as with limited feeding or aggressive skimming) ... you need to make sure that chemical energy is available from another source.



Quote:
... the capability of the zooxanthellae and the coral to retain carbon beyond that required to meet their respiratory needs depends on the availability of the commonly limiting nutrients, nitrogen and phosphorus. ...
mesocosm translation:
The extent to which zooxanthellae and their coral host(s) are able to do anything beyond staying alive (... metabolically speaking ...) is dependent upon the availability of nutrients in their environment.

mesocosm opinion:
This is why reefkeepers who have achieved a low-nutrient water column in their captive ecosystem are rewarded with wonderful opportunities to manipulate their corals' color expression through the dosing of both dissolved and particulate nutrients ... whether they're using ZEOvit or not.



Quote:
... the ratio of the flux of these nutrients into the colony to that of the photosynthetically driven carbon flux will regulate the growth of the zooxanthellae and of the animal. ...
mesocosm translation:
[Concentration of Nutrients] : [Photosynthates] ---> Zooxanthellae Growth
[Concentration of Nutrients] : [Photosynthates] ---> Coral Growth

mesocosm opinion:
Folks might do well to take note of the word flux ... we're talking about a dynamic relationship (dynamic: the condition of balance between varying, shifting, and opposing forces which is characteristic of living processes). And it's not just about the nutrient gradients present in a system's water column ... dynamics such as lighting (photosynthesis ---> photosynthates), water flow patterns (mass transfer rates), alkalinity (carbonate availability), and husbandry (the ultimate determinant of all of the various dynamics in captive marine ecosystems) all come into play regarding growth and color expression of corals.



Quote:
... Nutrients acquired by predation of the coral on zooplankton are available first to the animal, whereas those absorbed by the zooxanthellae from seawater as inorganic compounds lead first to growth of the algae.
mesocosm translation:
Particulate Nutrients ---> Coral.
Dissolved Nutrients ---> Zooxanthellae.

mesocosm opinion:
You can directly manipulate what corals and zooxanthellae "do" by manipulating the availability and ratio of particulate nutrients to dissolved nutrients.


JMO ... HTH
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  #4  
Old 06-20-2007, 09:26 AM
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Very well explained, Gary. Thank you. Do you have access the paper or just the abstract?
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  #5  
Old 06-20-2007, 05:43 PM
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Thanks Ger ! ...

Tragically, all I can find is the abstract:
http://md1.csa.com/partners/viewreco...&setcookie=yes


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