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Re:biogenic decalcification (carbon from the water)

> Date: Tue, 03 Apr 2001 02:35:33 -0700
> From: Steve Pushak <teban at powersonic_bc.ca>
> Subject: biogenic decalcification (carbon from the water)
> Dve Huebert wrote:
>> [snip] In the laboratory, submerged aquatic plants reach
>> maximal Ps rates at about 20 to 30 ppm CO2.
>> There are three ways to overcome this problem;
>> use bicarbonate... these are generally rosette species that naturally grow
>> in extremely nutrient poor, soft, acidic water... some of these species
>> even use their root systems to acquire DIC rather than taking up CO2
>> through their leaves.
> I take it that Crypts cannot get carbon from carbonates?
> Do Echinodorus or Aponogeton get it?
> - -- 
> Steve Pushak                              Vancouver, BC, CANADA
> Visit "Steve's Aquatic Page"      http://home.infinet.net/teban/
> for LOTS of pics, tips and links for aquatic gardening!!!


    I once had a large E. horemanii that exhibited the crusty, white calcium
build-up on the top surface of the leaves that I believe is typical of
biogenic decalcification. None of the other plants in the tank, including
various species of crypts and apononogetons, seemed similarily affected.
This may however have been the result of the extremely fast growth of the
sword? Baench V. 2 shows a photo of C. wendtii showing similar symptoms.


Ron Barter,
Perth, Ontario