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[APD] Re: The why of the Barr method

Great topic. I'll be most interested to see everyone's contribution.
I think the method works for a number of different reasons but when it comes to epiphytic algae I have a theory. Plants have been battling algae much longer than we have. Why aren't plants in nature covered in algae? (I know they sometimes are but they are just as often not).

I think you're too quick to rule out allopathy. I agree that the idea that plants are pumping allopathic chemicals into the water column or substrate is probably incorrect however at the cell surface where algae are trying to attach things may quite different. I think it is similar to the experiences of some where previously benign algaevores and detritivores like SAEs and snails turn into ravenous herbivores on our delicate plants. Complex allopathic chemicals, whether they deter herbivores or epiphytic algae are expensive to produce for the plants. If the plants aren't in top health they are too busy just staying alive that they cannot use their complex evolved responses to combat attack.

I realise this doesn't account for getting rid of green water or algae that don't/aren't attached directly to the plants but I think this is one of the things going on.

Tony Eales
333 Whites Rd
Lota, Brisbane 4179
Ph (07) 3365 6958
Home (07) 3396 8496

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