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injection for sewage treatment plants and so forth, that nexus of nutrient enrichment is revealed <br />on the coastal waters, and also by using nitrogen isotope analysis to actually identify that the <br />source of this nitrogen is being incorporated in the algae. So if you look at an injection well – <br />and these typically are very close to the shoreline and apparently the leachate that comes out into <br />the reef, coming up from the sediments – as you move away from that, the nutrient concentration <br />in the near shore waters of the sediments gets less and less and less and less. So there is a clear <br />signal that these human inputs in those sewage treatment plants are high on the list of impacts, or <br />having a direct contributory affect on the near shore water. And then this other work – nitrogen <br />isotope analysis – is suggesting that those nutrients are in fact being incorporated in the algal <br />tissue. So it’s almost the smoking gun for what’s really driving the proliferation of algae in the <br />last few decades there. <br />But in terms of having a level of which all of a sudden things become critical, I don’t know if I <br />could say that; I don’t know if they could say that, either.Part of the issue on Maui – what <br />makes it complex – is compared to the fish populations, the herbivore populations, which seem <br />to be a key element in sort of keeping levels of algae down, even if nutrients are rising. We are <br />in a very good situation here.Our algal feeders or herbivores or Parrot Fish populations, the <br />Surgeon Fish populations, are very high, so they graze the stuff. Now when you compare our <br />populations to Maui, it’s a different game; populations are very much lower there, likely due <br />initially to over-fishing. But once the algae starts accumulating, if you lower the population of <br />fish, it changes the whole habitat, so that areas maybe where Manini and important herbivore <br />could settle out before, now there is algae covering it, they don’t have a shelter, they don’t even <br />settle there. So it just becomes as positive feedback loop of, you know, more algae because of <br />the nutrients, less fish because of the fishing, more algae, more algae, until you end up with a <br />situation that’s just algal dominated. Waikiki is another example of that. So we are buffered <br />somewhat by our wonderful reef fish population. <br />But I think what the study from University of Hawaii was saying is that we are kind of on the <br />edge of the window that, okay, we have the nutrients increasing in the coastal waters and <br />anchialine ponds, maybe it’s being held back by fish, but if something depresses fish <br />populations, very quickly that could change. We could have a state change from coral rich to <br />algal dominated community. So you know that’s pretty much all I can say on that, is that we <br />may be on a cusp of change, radical change. And the change would be expressed in more <br />protected areas. If it’s in a wave exposed area, it’s going to be buffered by the water exchange. <br />So embayments or places that are more protected would be the first areas – sort of a canary in a <br />bird cage. <br />GRAHAM: Thank you very much. Commissioner Rho? <br />RHO: In your testimony you mentioned those anchialine ponds, and I think I’m <br />quoting you correctly, you say that the nutrients or the chemicals in the ponds, I guess in <br />Waikoloa, are way out of compliance. Is that not what you said? That is what you said? <br />WALSH: Correct. Yeah, the authors of the report from UH presented at another <br />aquatic conference in November. And there was one slide that they presented, looking at past <br />and present water quality conditions in the anchialine ponds at Waikoloa, and two of the <br />nutrients that they focused on: One, nitrate, which is really the critical nutrient for algal <br />enrichment, from the 1991 to 2002 period, had increased by over 300 percent and then phosphate <br />EXHIBIT C <br />12 <br /> <br />