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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Could tannins toxify salmoni fisheries?

I have been visiting the Cornell University webpage for Toxic Agents in Plants. Specifically tannins. I am interested in your opinions about the effects of tannins found in the bark of Lodgepole pine trees in high elevation watersheds that exhibit old forest growths. These trees upon natural decomposition, and as a result of stormwater effects, release tannic acid into natural streams. The question I have is as follows: In your professional opinion, do these natural decomposed growths have the potential to (1) raise the temperature of the stream water and (2) toxify salmoni fisheries?


I don't have the slightest idea if lodgepole duff affects salmonid fisheries. Intersting idea, though...