No, there is a difference between streaming and pearling.
Streaming occurs when you break a part of the plant or trim. The gas escapes from the open wound in a stream of bubbles. Sometimes the bubbles come out at 1 bps. Other times it's faster or slower. You see a stream of bubbles from the same origin (a damaged portion of a plant or a freshly cut stem).
Pearling usually denotes the bubble(s) you see at the tip of an uncut leaf, root, or stem (produced internally by photosynthesis). For pearling to be true, it should happen without the aid of a water change. Water change induced bubbles are not the same as pearling. Water induced bubbles show that the newly introduced water is O2 saturated. Nothing more.
All your findings show is that when you introduce the same water into the tank, the O2 levels are the same = no pearling.
When you add new water, the newer water has more O2 = "pearling" (although it's not true pearling).
What was your water source for the newly introduced water?
I would also venture to guess that water with fewer organic pollutants will be richer in O2 than stale tank water that is a few days old and has been recirculated a few thousand times in a closed loop canister filter system.
You're going to have to try harder to convince me about this osmotic pressure = plant growth hypothesis (remember that you haven't proven anything, you're made an empirical observation). Just because something appears to be so doesn't mean one can assume w/o doubt that the idea is right. Did you control for all variables in your study?
Solcielo lawrencia;115715 said:
There is no difference between pearling and streaming. A string of gas bubbles rising from a plant = a string of pearls = pearling. Gas bubbles coming from a plant but hasn't broken away from the plant to the surface is the same thing. But my inquiry was not about pearling. It was about the change in osmotic pressure. The previous test a few posts back showed zero pearling when removing and adding back the same water. Why? Because the tonicity of the water taken out and added back in was exactly the same. But then adding fresh water caused it to pearl from both the HC and the cut stems of Rotala before I even finished refilling. This, combined with this recent test, confirms (at least to me) that any pearling right after a WC is the result of osmotic pressure. Whether or not the changes in osmotic pressure directly leads to increased plant growth is my inquiry.
This conclusion also puts the variable of pressure back on the table.