Oxygen in the pond – update

After three weeks of pretty much continuous ice cover, the dissolved oxygen levels are still holding up well in the ponds.

The old pond (red line) still has plenty of oxygen – at these temperatures levels of 16 mg / litre of dissolved oxygen are above 100% saturation.

The new pond dropped back a bit yesterday to the pre-Christmas levels but still, with levels around 11-12 mg / litre dissolved oxygen, the water is  70-80% saturated with oxygen.

The last two values, both taken yesterday, show the difference between morning (lower) and evening (higher). All the other values are measured around 17.00-19.00 when values will usually be highest.

Our ponds are doing well – but not all ponds are so high. More news coming soon.


2 Responses to “Oxygen in the pond – update”

  1. Julia Says:

    I just wanted to say that I’m really enjoying the pond analysis! It’ll be great to follow this throughout the year.

    The oxygen info is very interesting. I’d never have thought that the ice actually traps oxygen if the water plants can still photosynthesise, but when you think about it, it’s logical. I guess the ice would also trap methane etc from decomposing leaves etc? But then again, rates of decomposition must be very slow at this time of year.

    Look forward to the next instalment!

  2. Richard Says:

    Are your ponds covered in snow, ours has the past few days and I’ve only just got round to clearing it? Would that affect photosynthesis of the plants underneath.
    We also broke the ice – to give the birds something to drink and it’s 5cm thick, in fact the pondweed is frozen inside it. Do you think this would be a fatal blow to the snails and plants inside, or will the recover?

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