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2005 Tricolored Blackbird Survey - results and thanks

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  • granatellus
    With the results compiled, we wanted to take this opportunity to thank all participants and contributors to the statewide 2005 Tricolored Blackbird Survey. The
    Message 1 of 1 , Jan 31, 2006
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      With the results compiled, we wanted to take this opportunity to
      thank all participants and contributors to the statewide 2005
      Tricolored Blackbird Survey. The survey, undertaken in two periods,
      April 22-24 and June 3-5, was the most comprehensive survey of
      Tricolored Blackbirds ever undertaken, and the credit for that goes
      to the superb response from you, the observers. The results have
      contributed significantly to the understanding of the distribution
      and ecology of the species, and hence to Tricolored Blackbird
      conservation.

      Just under 200 observers contributed 269 reports of colonies and
      flocks from around the state. After collating and analyzing all the
      reports, and eliminating possible duplication, the April survey
      located colonies totaling just over 261,000 adult Tricolored
      Blackbirds. This is nearly 100,000 birds more than recorded during
      the last statewide survey in 2000, an apparent increase that may be
      due in part to the relative thoroughness of the 2005 survey.

      Results from the June survey, which focused more heavily on the
      northern part of the state, were equally interesting but for
      different reasons. With the 2005 survey being the first statewide
      survey ever conducted in the later part of the breeding season, we
      didn't really know what to expect, and some 126,500 adult Tricolored
      Blackbirds were located at colonies. While follow-up observations
      indicated that many adults were still moving north from southern
      breeding areas at the time of the survey, it is also apparent that
      some adults were not refound after the April survey, perhaps
      following dispersal to non-breeding areas. What those post-breeding
      adults do and where they go will be an important topic for future
      research.

      Full, detailed results of the 2005 survey will be presented formally
      elsewhere shortly. Again, the success of the survey would not have
      been possible without your contribution, for which we are extremely
      grateful.

      Following a triennial tradition, the next big volunteer-based survey
      for Tricolored Blackbirds will be in 2008. In the meantime, please
      continue to report colony locations as you find them every spring and
      summer to Michael_green@.... In addition, some members of the
      Tricolored Blackbird Working Group might embark on a large banding
      project, in which case your observations of banded Tricolored
      Blackbirds would be invaluable; please stay tuned for further
      details.

      Many thanks and best regards,

      Jon King and Leo Edson, EDAW, Inc.
      Mike Green, US Fish and Wildlife Service.
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