Seabird nutrients enhanced coral growth rates

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I was watching a youtube video by ReefMan about this article:

Seabird nutrients are assimilated by corals and enhance coral growth rates

Seabird nutrients are assimilated by corals and enhance coral growth rates

Nutrient subsidies across ecotone boundaries can enhance productivity in the recipient ecosystem, especially if the nutrients are transferred from a nutrient rich to an oligotrophic ecosystem. This study demonstrates that seabird nutrients from islands ...

www.ncbi.nlm.nih.gov

Video


The corals on the right grew in an area where there's a large seabird population and iron/nitrate/phosphate is "deposited" into the coral ecosystem.

Seabird guano elevates dissolved organic nitrogen32, inorganic nitrogen15,16 and phosphate concentrations in seawater

This chart shows the nutrient concentrations:

The zooxanthellae were extracted from these coral samples and analyzed for cell density and natural abundance stable isotope ratios of nitrogen (δ15N). Since ornithogenic nitrogen is enriched in 15N over background levels of nutrients8,15,54–56, δ15N provides a natural tracer that can be used to assess the influence of seabird-derived nutrients in corals1

My question is - if we dose Sodium Nitrate and Trisodium Phosphate, are we creating the same environment in our reefs? When the article refers to inorganic/organic nitrogen does that mean amino acids or fish waste instead of Sodium Nitrate? It appears there should be a balance of nitrogen sources.