Dissolved oxygen as measurement proxy for photosynthesis?

[Larry L]

I notice that my dissolved oxygen measurements seem to track very closely to my lighting profile, which makes sense since generally more light = more photosynthesis = more oxygen being produced. I know there are other factors that affect overall oxygen levels, but do you think it tracks closely enough to be used as a rough proxy for rate of photosynthesis? E.g. could I ramp up my lighting intensity over time and when the O2 levels stop increasing accordingly I'd know I had hit some level of photoinhibition?

 

[Sallstrom]

I notice that my dissolved oxygen measurements seem to track very closely to my lighting profile, which makes sense since generally more light = more photosynthesis = more oxygen being produced. I know there are other factors that affect overall oxygen levels, but do you think it tracks closely enough to be used as a rough proxy for rate of photosynthesis? E.g. could I ramp up my lighting intensity over time and when the O2 levels stop increasing accordingly I'd know I had hit some level of photoinhibition?

We've done experiments on corals and their oxygen production with different light.
I think the time were 90 minutes.
We could see big changes in O2. Water volume was about 250 ml per coral.

Never tried measuring oxygen in a tank long term, but that would be very interesting
Any graphs?

 

[Breadman03]

I think Dana Riddle did some measurements on photosynthesis and posted about them here. I'll see if I get a minute to find it.

Here's a solid search term: "photosynthesis dana riddle site:reef2reef.com"

I spent a few minutes looking at flourometers and.... WO$$$$$OW!