Dead female frog.
Observation - Dead female frog. - UK and Ireland. Description: The coating on the freshly exposed eggs from within the ovisacs can only be described as glue. It began to take on water immediately and the glue was on its way to becoming the familiar jelly capsule around the ova. The purpose of the adhesive quality of
The coating on the freshly exposed eggs from within the ovisacs can only be described as glue. It began to take on water immediately and the glue was on its way to becoming the familiar jelly capsule around the ova. The purpose of the adhesive quality of the coating would appear to be to keep the spawn together- it stuck to anything it came into contact with as can be seen.
Having had this on my fingers I can understand why this might put some predators off consuming these ova. It is a highly adhesive glue before it takes on its full capacity of water. This might make it difficult to eat and would explain why some predators choose not to eat it.
I had been expecting to produce a mass of jelly as in the cases of star jelly by placing the frog and all its innards in water overnight but the last pic shows the results, a frog, a batch of frogspawn and an oviduct.
Editing- My theory about the unpalatability of the ova wouldnt explain why a predator couldnt just swallow the frog whole and therefore avoid contact with the sticky ova but it would appear from other observations that some predator(s) are avoiding not only the ova but the oviduct also when they consume a frog. Maybe the potential for the spawn to significantly increase in mass is another reason that a predator might not wish to have it inside its alimentary canal?
Editing again- What I have called ovaries above may be better termed ovisacs(altered accordingly). Egg storage not egg production. Big difference, my error.