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I have never said that - I have only said that if they get lack easy accessible food for low energy cost - they are able to change food supplier. Let us put it this way - my nearest shop where I can get potatoes is 500 m downhill from me. It cost me rather little energy (read work) to bike down there and buy my potatoes - the energy cost comes when I should uphill again . But if the potatoes is out of stock in that shop - I have to go around 9000 m to the next shop (back and forward) and get the dam uphill in the end too in order to get my potatoes. If both shops are filled up with potatoes - which should you chose - I know my answers. But I can do it more effective if I need to go to the other shop - I can take my flying mat (read KIA Picanto) and drive there - it will be more effective but cost more energy. So - then my neighbors see me open the garage - they know - there is no more potatoes in the nearest shop
Sincerely Lasse
This is the line that I question
“But it cost energy and it is easier to get P and N in the water column but if it is empty there - they form mats and get their nutrients from sediments (even inorganic) and from organic matter”
My point is that I have not read that cyanobacteria form mats to go looking for nutrients, the reason being is they do not have sufficient nutrients to generate the biomass to create those ugly mats we all hate. Food first, then mat formation.