Thanks for the excellent response! I didn’t go into the Bogoslof Island boom in this story (which is plenty long already!), but I did cover it in an earlier KUCB story: http://archive.kucb.org/news/article/fur-seal-numbers-boom-on-aleutians-remote-bogoslof-island/
I’d hoped to tag along to Bogoslof with seal researchers last summer but couldn’t make that happen.
Researchers have told me the increase on Bogoslof is a tiny fraction of the losses on St. Paul. And I’m not clear whether any/many seals are “emigrating” from the Pribilofs down to tiny, young Bogoslof Island, or the Bogoslof population is just booming all on its own.