Why can't you grow bluegrass in a pine forest? (rhetorical question)
Great and simple illustration of this whole line of logic, Bruce. Thanks - makes a lot of this much more clear (kinda like your water!).
And remember, from a figurative standpoint, either the sago or the single celled algae can be the pine trees. But it doesn't have to be domination of the sunlight specifically. When the algae dominates the light availability, it wins. When the sago dominates the nutrient availability, it wins.
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