I've recently planted some lilly pad in my pond. A week or two later I noticed that some of them seem to be "eaten" down to where they emerge from the pond floor.

Are they being eaten and if so, by what? This has not happened to all the pads I planted.

Thanks.
Sunil

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."