On grass, 10m away from a pond which was full of frog spawn. Can anyone give a reason?
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Very similar to the example in my garden, perhaps a very heavy rainfall at that time when the frog laid the spawn.
The eggs were in a sac/sheath and there were 3 heaps of the jelly (without eggs in it) several metres apart. It wasn't the result of flooding from the pond,more like pre fertilisation but why and what became of the frog?
Three possible reasons:
First, the female was molested by so many males at once that she didn't know where she was, and the laying instinct took over.
Second, it may have been removed from the water by a predator who was then disturbed and didn't have chance to eat it.
Third, it was laid at the edge of the pond and washed out by rain or disturbance.
Thank you RogerR, I can see your first suggestion as a possibility but why would the eggs still be together in a membrane and the jelly be totally empty?
Frogspawn is very stick and stays together, in order for a predator to have taken some it would have had to bite it. Frogs sometimes lay their eggs in large but short-lived puddles, like this.
If laid out of the water, then fertilisation is much less likely, I think. Hence the jelly would probably not show fertilised embryos. If I remember rightly the membrane normally breaks as laying begins - may be dissolved by water? Don't think my remaining, very out of date, biology text book goes into so much detail!
Short answer - I really don't know!
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