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Barred Owl Study Update

Photo of samples being collected from a barred owl

The goal of this experiment is to test the feasibility of barred owl removal to determine whether it improves conditions for spotted owls on a small scale. We will remove barred owls on less than one twentieth of one percent of the range of the barred owl.  USFWS estimates it will take 4 years of removal before there is enough data to detect whether barred owl removal improved spotted owl population trends.

  • Update of Barred Owls Removed

    The following tables summarize the number of individual barred owls removed on each study area.    

    Year

    Individual Barred Owls Removed by Study Area

    Hoopa

    Oregon Coast Ranges

    Cle Elum

    Union/Myrtle (Klamath)

    2013/14a

    71

    ne

    ne

    ne

    2014/15a

    54

    ne

    ne

    ne

    2015/16a

    45

    244

    125

    na

    2016b

    36

    ne

    ne

    ne

    2016/17a

    25

    211

    84

    169

    2017b

    41

    34

    ne

    16

    2017/18a

    43

    175

    103

    157

    Total

    315

    664

    312

    342

    a Non-breeding season removal – generally September 1 through April 15

    b  Breeding season removal – April 16 through August 31

    ne = no effort

     

    After years of barred owl removal, we developed a protocol that allows us to determine if barred owls are nesting.  As described in our Final Environmental Impact Statement and Record of Decision for this experiment, this allows us the option to remove non-nesting barred owls during the breeding season.  This is being done across the Hoopa treatment area and in selected areas of the Oregon Coast Ranges and Union/Myrtle (Klamath) study area.

    Year 2015/2016 Cle Elum includes one live-capture provided to the High Desert Museum, Bend, OR. 

     

    Photo above of researcher Zachary Hanna of the Museum of Vertebrate Zoology and California Academy of Sciences collecting tissue samples from a barred owl on the Hoopa Study Area for genetic and other analyses.
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