Date: 8/26/19 8:14 am From: Daniel Edelstein <danieledelstein...> Subject: [wisb] Comment Regarding: Bobolink Dispersal & Migration
> > From: ROBERT SPAHN <rspahn...> > Subject: Bobolinks > Date: August 24, 2019 at 6:05:24 AM PDT > To: <danieledelstein...> > > Hi Daniel, > Interesting observations and questions. > I have lived for a considerable time (50 years+) in upstate NY, but grew up in E. Iowa with a family cottage in N. Wisconsin and get back there virtually every > year. For the past 5 years I have made sure my visits coincided with the peak of "confirmation" season for the WI BBA II project = most of July. In NY, I have > been writing local monthly summaries and writing or editing quarterly regional reports for our state birding journal, The Kingbird, for 40+ years. > > Bobolinks are interesting and much of their behavior matches what you have observed and read. After breeding, the Bobolinks here in NY (we're about > the latitude of the lower middle of WI in the Rochester area) move to the big fresh water marshes, like Montezuma NWR, the Iroquois NWR complex, and > the ends of the Finger Lakes. This move can start by early July and the interquartile range (= 50% of the time over the years) of their departure date distribution > is September 2-11, with the last seen earlier 25% of the time and later 25% of the time.
> It is not particularly unusual to have individuals still found in the marshes > as late as mid-October. We have had a fun, big-day, money raising event in the Montezuma area for 23 years now on a Friday evening to Saturday evening > in mid-September. We always have Bobolinks in the marshes then, often in substantial numbers.
> Looking to your comment about only seeing females, I'd say don't be so sure. Since the males are into molting into a plumage that looks very like the females > and the young of the year look like females, it really is not clear that you are not seeing a mix, certainly by well into August males may be hard to ID as such. > > Best regards, > Bob Spahn