We have a natural pond approx 10m x 2m that is 2 years old. It has reasonable plant coverage now and plenty of newts but little frogspawn this year. However, this year the pond has been taken over by green globular jelly algae. The globules are around 1-2cm across and appear to have air bubbles in them and range from a bright green to brownish green colour. They maintain their shape when taken out of the water. I have search the web for info but found nothing at all. I notice that there was string on the subject in 2005 with no real resolution.
I have uploaded some pictures. Can anyone tell us what these green invaders are and how to get rid of them, if indeed if need to get rid of them.

Thanks alot