Dear tbob,
Thank you for reporting this!
I'm sorry to say that the ponds are managed under the Long Valley MA project.
I have just called the pond owners to sort out what happened.
They are surely not cutting down trees to prevent bird roosting. The owner said there are many bugs and insects on trees which affect them and therefore they "trim" the trees. I know this trimming method doesn't look like the ordinary trimming, but this is the way that farmers in Long Valley usually do.
In addition, although the ponds are managed, trees and crops on the bund are not included in the agreement. We will try to advise the farmers on this issue.
Thank you once again!
Vicky