It’s frog city out there

UPDATED: 9.0 am 21 March 2010. There are now another 17 clumps in other parts of the pond away from the main spawn patch.

It’s a common phenomenon for frog numbers to build up quickly in new ponds.

This has certainly happened in my ‘old’ pond, filled in April 2007.

In 2007 we were too late for the frog breeding season.

In 2008 we had 2 clumps of spawn.

In 2009 we had four – and a huge number of tadpoles which stripped the pond bare and turned the water green for a while.

This year the frogs have really gone for it.

The mat of spwan is about 1 m wide: it's about 50 clumps.

The tape measure is pulled out to 1 metre

There’s a one metre wide patch of spawn which, using the graph below, is equivalent to about 50 clumps which means 50 female frogs (each female lays one clump of spawn).

And there are a few more clumps away from this main patch.

To work out how many spawn clumps you estimate the area of the spawn patch in square centimetres – a patch 1 m diameter is roughly 7500 square centimetres.

On the graph you read up from 7500 on the horizontal axis until you cross the middle line of the graph – and then read back to the vertical axis to estimate the number of clumps.

So that means we’re heading for somewhere between 50,000 and 100,000 tadpoles in the pond (there are usually 1000-2000 eggs in a clump).


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