VCE wrapped up our June-July banding season on Mansfield yesterday. Lots 
of juveniles and molting adults, and non-local wanderers from lower 
elevations. We captured 49 birds overall. For the season, we netted 43 
Bicknell's Thrushes (42 adults, 1 juvenile). Exactly half of all adult 
captures were of birds banded in a previous year (only 37% of 2014 
captures were returning birds). Even more interesting is the ratio of 
males to females. During the first 20 years of our banding, the sex 
ratio averaged 2.2 males for every female. Last summer that ratio held, 
as only 13 of 43 known-sex adults were females (a 2.3:1 ratio). This 
summer, we caught 41 known-sex adults, and 15 were female, a ratio of 
1.7:1. I'm sure that's not even close to being statistically 
significant, but it's encouraging.

For a wrap-up of our final summer visit, check the VCE blog at 
http://vtecostudies.org/blog/summer-banding-on-mansfield-ends-with-a-flourish/. 


Chris

-- 
Chris Rimmer
Vermont Center for Ecostudies
P.O. Box 420
Norwich, VT 05055
802-649-1431 ext. 1
www.vtecostudies.org

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