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- Newsgroups: rec.birds
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!rpi!utcsri!utzoo!tony
- From: tony@zoo.toronto.edu (Anthony L. Lang)
- Subject: Hawk migration down
- Message-ID: <By179p.58r@zoo.toronto.edu>
- Date: Fri, 20 Nov 1992 20:22:36 GMT
- Organization: U of Toronto Zoology
- Lines: 35
-
- in article <27695@oasys.dt.navy.mil>
- quezon@oasys.dt.navy.mil (Antonio Quezon) writes:
-
- >(stuff deleted)
- >
- >I have my theories, but I'm curious to hear what others
- >think. What are the observations/perceptions of other
- >east coast raptor enthusiasts out there? For that matter,
- >what are other people across the continent experiencing?
- >Any theories or explanations? I am aware of the tremendous
- >crash in the Sharp-shinned Hawk and American Kestrel
- >populations. I've heard and read theories explananing
- >this crash. What have others heard?
-
- The word from the Hawk Cliff hawk watch/banding station at Port
- Stanley, Ontario on the north shore of Lake Erie is that the migration
- has been slow this year, partly because of the coldest, wettest
- year on record in Canada. One of the banders from Hawk Cliff
- gave a talk to the Toronto Ornithological Club recently and mentioned
- general long term trends, although the data had not been adequately
- analysed. He said that PEREGRINE (Falco peregrinus) and MERLIN
- (F. colmbarius) numbers are up substantially. In at least
- the case of the former, the decline in the use of DDT and
- the reintroduction programs are probably the reasons. AMERICAN
- KESTREL (F. sparverius) and SHARP-SHINNED HAWK (Accipter striatus)
- numbers are down significantly, corroborating what Antonio has said.
- Unfortunately, the reasons for this decline are not clear,
- although there is speculation about problems on the wintering
- grounds.
-
-
- --
- Anthony Lang
- Dept. of Zoology, Univ. of Toronto
- tony@zoo.utoronto.ca
-