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Old 06-01-2004, 12:22 PM   #1 (permalink)
 
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Default When exactly does pearling happen?

When, exactly, does pearling happen? Is it pretty much a constant thing in flourishing planted tanks, or is there a specific time at which this happens?
I'm asking, because for the whole day right after I do a 25% water change in my tank, I see tiny little bubbles all over my plants. At first, I had thought that this was just extra oxygen (or chlorine gas???) escaping from the new water I just added, but I do add conditioner, so I wouldn't think there'd be that much that would stick around for that long.
Thanks in advance!
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Old 06-01-2004, 12:34 PM   #2 (permalink)
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Pearling occurs when the water is saturated with oxygen and additional oxygen produced by the plants simply forms a bubble and floats to the surface rather than being dissolved into the water. This occurs at different times depending on the rate of growth and oxygen levels during the night, but in general it occurs more towards the end of the light period or at least in the second half.

When you do a water change a similar thing occurs due to the pressure the tap water is held in the pipes. This saturates it with gasses and will therefore appear to make the tank pearl temporarily. If this continues longer than say half a day, I'd say that the plants are also contributing to the extra pearling and the tap water you added may be providing some trace elemenets that the plants were in short supply of prior to the change. This is evident when you do a water change and plants pearl like mad for a couple days then taper off until the next water change.

Hope that helps
Giancarlo Podio
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Old 06-01-2004, 12:46 PM   #3 (permalink)
 
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But the different species of plants have their own speed to make bubbles, do you think it depends of the thickness of the cuticle or epidermis cells walls or depends of the entire leaf thickness or depends of their particular use of the O2 produced by their photosynthesis?. Thanks. Maurici.
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Old 06-01-2004, 01:53 PM   #4 (permalink)
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I think where the bubbles comes from might have something to do with the leaf thickness. But as far as i know the photosynthesis rate of the plant is what controls bubbling ability.
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Old 06-01-2004, 02:11 PM   #5 (permalink)
 
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Bummer- it sounds like I've just got gas Guess I'll have to wait until I go pressurized to see REAL pearling. Thanks for the help!
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Old 06-02-2004, 06:47 AM   #6 (permalink)
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Quote:
Originally Posted by Maurici
But the different species of plants have their own speed to make bubbles, do you think it depends of the thickness of the cuticle or epidermis cells walls or depends of the entire leaf thickness or depends of their particular use of the O2 produced by their photosynthesis?. Thanks. Maurici.
All plants release oxygen during photosynthesis, you just don't see the bubbles until the water is saturated. While I'm sure each plant has it's own rate and various properties of the plant may govern the rate of oxygen release, I think the growth rate is probably the biggest influence. Fast growing plants like many stems, riccia and glosso pearl a lot more than slow growing plants such as anubias and crypts for example. The more fast growing plants you have, the sooner your tank will reach oxygen saturation and begin to pearl.

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Old 06-02-2004, 08:13 AM   #7 (permalink)
 
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Hello, gpodio, I agree with your comments about the need of water saturation on O2 to pearl, but I would focus the pearling effect on the specie and the O2 saturation on the boundary layer rounding each leaf. I think there is no a fact related with the entire column of water saturation because this will imply the bubbling of every plant of the tank (which is no the reality) taking on account that all of them are making photosyntesis. It's seems quite right taht it must depend of the speed of growing, it is interesting, thanks. Maurici.
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Old 06-02-2004, 01:43 PM   #8 (permalink)
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my wendtii has traditionally been one of my heaviest pearlers in tanks with Hygro difformis Hemianthus umbrosum Limnophila Aromatica Rotala green etc... Wendtii has had a tendency when in full light to pearl as much if not more then these.
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Old 06-03-2004, 06:40 PM   #9 (permalink)
 
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Quote:
Originally Posted by ShaneSmith
wendtii has traditionally been one of my heaviest pearlers
Lets make a distinction between pearling and streaming.

Crypts are big streamers from damaged spots on leaves or roots. They will stream a bubble size proportionate to the hole of origin. Streaming is not dependant on O2 saturation and will begin a few minutes after lights on. Often streaming will catch under the leaves of taller plants and look like pearling from those plants.

Riccia is a notorious pearler. It will begin forming small bubbles several hours after lights on. These bubbles begin small and grow till large enough to break away, they do not form streams of bubbles. Pearling is dependant on localized O2 saturation.

Shane are your crypts streaming or pearling?

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Old 06-04-2004, 01:47 PM   #10 (permalink)
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Streaming. I guess i was wrong. Then Rotala Macranda green is my heaviest pearler. I want to know is streaming unhealthy?
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