Yes, locked gates and fencing are springing up on BLM lands here in AZ and it is with the cooperation of AZGFD.
We used to be able to ride our horses long distances here unencumbered on public lands so long as there was water every 20 miles or so. Just 10 years or so ago, a group of us rode from Williams AZ all the way down to Black Canyon City outside of Phoenix.
Today that route is no longer open, the springs we watered at on vast stretches of BLM land have been fenced off by AZGFD, with signs proclaiming the areas as waterfowl habitat.
We used to ride north from here on an old mining trail built for pack animals and could go up into the Bradshaws via Tule Springs and Boulder Creek beyond. All fenced off now due to the springs there.
Not arguing the necessity or virtue of the fencing, but it's new and it's there.