[Tweeters] CBC trends in a warming world

[Steve Hampton]

With the Christmas Bird Counts coming up, I want to share some recent
analysis I did for six species that are at the northern edge of their
wintering range in the PNW. Research suggests many species (especially
non-migratory species and short-distance migrants) are shifting their
ranges north, both in summer and winter. CBCs, with their long history, are
great at tracking large scale distribution changes over time, something
that eBird just can't do yet. A lot of publications are now using CBC data
to track climate change issues.

I looked at *Cedar Waxwing, Hermit Thrush, White-crowned Sparrow, Lincoln's
Sparrow, Orange-crowned Warbler, and Yellow-rumped Warbler*. I found all
were increasing, to some degree or another, on CBCs in the PNW.

The details and graphs are here:
*Heading south for winter, more birds are choosing the Pacific Northwest
<https://thecottonwoodpost.net/2022/10/07/heading-south-for-winter-more-birds-are-choosing-the-pacific-northwest/>*

----

Previously, I've posted about the expansion of California Scrub-Jays
<https://thecottonwoodpost.net/2021/10/28/mapping-the-expansion-of-the-california-scrub-jay-into-the-pacific-northwest/>
and Lesser Goldfinches
<https://thecottonwoodpost.net/2021/03/15/the-song-of-the-lesser-goldfinch-another-harbinger-of-a-warming-climate/>,
as well as a number of non-migratory species (Anna's Hummingbird, Black
Phoebe, others) *The invasion of the Pacific Northwest: California’s birds
expand north with warmer winters
<https://thecottonwoodpost.net/2020/03/09/the-invasion-of-the-pacific-northwest-californias-birds-expand-north-with-warmer-winters/>*

Our CBC data is being used!

good birding,


-- 
Steve Hampton
Port Townsend, WA  (qatáy)
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