Some common frogs choose to spend the winter at the bottom of ponds. Buried down amongst the mud and silt, they survive by breathing through their skin. When ice forms on a pond the frogs become trapped with limited oxygen and various noxious gases building up.
In the past, Froglife has always recommended that a hole is maintained in the ice but recent reports suggest this may not make any difference to the frogs’ survival. Instead, the most important thing is to make sure snow is cleared from the ice to allow light to access the water. This way plants will still be able to produce enough oxygen. If you have a pump, leaving this running throughout the winter can also help.
If you do decide to try and make a hole in the ice – to release the build up gases (it won’t make much difference to the oxygen content in the water) – the easiest way to do this is to leave something floating in the water which can be removed once the ice as formed. Otherwise, stand a pan of hot water on top of the ice to melt a hole. Never pour on hot water, chemicals or salt or try to smash the ice as this can be damaging.
Despite your best efforts it may be that you still lose some frogs over this wintry period. You will see them floating under the ice or rising to the surface once the ice has melted. Although this is not nice to see, it is quite natural for frog populations to suffer losses at this time of year and it should not have too much overall impact.
“It’s normally older, male frogs that hibernate in water,” says Lucy Benyon, Froglife’s Information Officer, “The rest of the local frog population will be tucked up elsewhere – behind logs, in compost heaps or under sheds. It can be distressing to find dead frogs but it should not cause too many problems in the long term and, unfortunately, there’s virtually nothing you can do to prevent it.”
To help hibernating amphibians, and reptiles, in your garden in future ensure there are plenty of hidey holes such as log piles and rockeries. It’s also a good idea to give your pond a bit of a clear out in the autumn and stock up on oxygenating weed.
For further advice about amphibians, reptiles and ponds please see the Froglife website.
And remember... have a toad-ally awesome Christmas and a Hoppy Newt Year!
And remember... have a toad-ally awesome Christmas and a Hoppy Newt Year!
Please note: the Froglife office is closed over the Christmas period and will reopen on 5th January 2011.