Thats the best description I have heard yet
I wonder if this is where the "excess" theory came from.
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Generally it's a lack of something, the plants are not being provided with what they need to grow well at a given light intensity.
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A person says, I have lotes of BBA, 0 N and 2ppm P. P must cause this algae, when in reality it is actually the lack of N Caused the plants to stop growing so the algae went, Oh, my turn. THe higher P(or considered higher at the time) is just a result of the plants stopping nutrient uptake.
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The other issues revolve around a lack of CO2, NO3 etc, which stresses plants causing them to stop taking up nutrients and deteriorating conditions, the algae seem to "know" when this occurs and CO2 variation, no NO3 etc brings out stress responses in many algae species, which they respond to by going sexual and becoming active.
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THis makes a lot of sense, especially if you compare it to plants in general, especially terrestial plants. The algae are mearly responding to an ideal enviroment, at least for them, which happens to be a less than ideal enviroment for hte high plants around them. Much the way many desert plants only wil germinate when there is a certain amount of rain at he right time of year.
"The algae seem to 'know' " How? Do we know yet or is that somehting that has yet to be fully understood?