This system was at .4 mg/l PO4 when this video was taken. Nitrates were negligable.
I don't see any reason to keep PO4 lower than the
.03 mg/l threshold level identified by Southampton University in England. Since they determined it by looking at phosphorus deficiency in corals maintained in aquaria for up to around a decade seems like a definitive lower number until we can quantify particulate and dissloved organic P used by corals. Upwelling can expose to corals to
.3 mg/l so that seems like a fine number also. And at the higher end the sexually reproduced corals at the
Steinhart Aquarium are being grown out with .9 mg/l PO4 and 50 mg/l Nitrate (Rich Ross is part of the research team in case anyone was wondering).
Here's links I've found some may be interested in
An experimental mesocosm for long-term studies of reef corals - Volume 92 Issue 4
www.cambridge.org
An Experimental Mesocosm for Longterm Studies of Reef Corals
Phosphate Deficiency:
Nutrient enrichment can increase the susceptibility of reef corals to bleaching:
Increased dissolved inorganic nitrogen (DIN) concentrations in sea water have been linked to a reduction of the temperature threshold at which corals bleach, however, the mechanism underlying this change is not known. This phenomenon is now explained in terms of increased phosphatase activities...
www.nature.com
Ultrastructural Biomarkers in Symbiotic Algae Reflect the Availability of Dissolved Inorganic Nutrients and Particulate Food to the Reef Coral Holobiont:
Reef building corals associated with symbiotic algae (zooxanthellae) can access environmental nutrients from different sources, most significantly via the up...
www.frontiersin.org
Phosphate deficiency promotes coral bleaching and is reflected by the ultrastructure of symbiotic dinoflagellates
Enrichment of reef environments with dissolved inorganic nutrients is considered a major threat to the survival of corals living in symbiosis with din…
www.sciencedirect.com
Effects of phosphate on growth and skeletal density in the scleractinian coral Acropora muricata: A controlled experimental approach
Phosphate contamination can negatively affect corals, modifying growth rates, skeletal density, reproduction, mortality, and zooxanthellae. We determi…
www.sciencedirect.com
High phosphate uptake requirements of the scleractinian coral Stylophora pistillata
SUMMARYSeveral untested aspects of the regulation of inorganic nutrient uptake were examined using nutrient depletion experiments with the symbiotic coral Stylophora pistillata. The total inhibition of phosphate uptake in artificial seawater lacking sodium indicates the involvement of a...
jeb.biologists.org
Phosphorus metabolism of reef organisms with algal symbionts
2657円まるいち 博多辛子明太子(無着色) 「博多の華」 (ギフト用) 180g Z6572海産物イクラ,タラコ,魚卵 Qoo10] 「博 まるいち 博多辛子明太子(無着色) | therichross.com
therichross.com
Sponge symbionts and the marine P cycle
Marine sponges are ubiquitous colonizers of shallow, clear-water environments in the oceans (1, 2). Sponges have emerged as significant mediators of biogeochemical fluxes in coastal zones by virtue of respiring organic matter and facilitating both the consumption and release of nutrients (3, 4)...
www.pnas.org
Phosphorus sequestration in the form of polyphosphate by microbial symbionts in marine sponges
Coral reefs are highly productive ecosystems that raise a conundrum called “Darwin’s paradox”: How can high production flourish in low-nutrient conditions? We show here that in three abundant Caribbean sponges, the granules that have been commonly observed in sponge tissue for decades are...
www.pnas.org
Fig 4 from "Phosphorus metabolism of reef organisms with algal symbionts"
Corals are looking good, and the few SPS I have are growing (dosing using Balling method). There is some correlation between high nutrients and decreased KH consumption.
