[Tweeters] Novel machine-learning method produces detailed population trend maps for 550 bird species

[Robert O'Brien]

Wow, thanks.  I did not know that was so easily available.
As a test I just compared Rufous vs. Anna's Hummingbirds
No great surprise that Anna's are on the increase, most especially around
urban areas. SeaTac and then PDX
Sadly Rufous is the reverse-strong decrease everywhere.  I have certainly
observed this here SE of Portland over the last 50 years.
I could describe further, but very easy for interested birders to check for
themselves

But, do you know of a scientific paper or report that describes how they
arrive at the trends?  Correction for observer effort, accuracy and
precision over time, etc.?
Thanks again, Bob OBrien  Portland


On Mon, Aug 14, 2023 at 1:16 PM Steve Hampton <stevechampton at gmail.com>
wrote:


> Ah, this is the science paper behind eBird's amazing Trends maps. They are

> remarkable. In some instances I was able to compare them with other data

> (e.g. surveys or even CBC data) and they lined up pretty well.

>

> To see them, go to *eBird*, click the *Science *tab, then *Status &

> Trends*, and then type in a species name.

>

> It defaults to the *Abundance *map, which is a basic range map color

> coded for abundance -- by season. You can then click on *Trends *and see

> the red, white, and blue dots. If you hover over them, the detailed trend

> appears.

>

> For example, if I hover over the dot nearest Seattle for Spotted Towhee,

> it says declined 28%. That is since 2007 (there's a legend on the upper

> right).

>

> These are wonderful maps -- each dot on each map is like a survey of its

> own.

>

>

>

> On Sun, Aug 13, 2023 at 2:01 PM Alan Roedell <alanroedell at gmail.com>

> wrote:

>

>> Interesting article. My impression after living in Seattle for 80 years,

>> is that most species have declined.  Crows and accipiters buck the trend.

>> I miss the swallows most.

>> Alan, Seattle

>>

>> On Sun, Aug 13, 2023, 12:52 PM Dan Reiff <dan.owl.reiff at gmail.com> wrote:

>>

>>>

>>>

>>> https://phys.org/news/2023-08-machine-learning-method-population-trend-bird.html

>>>

>>>

>>> Sent from my iPhone

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>

> --

> ​Steve Hampton​

> Port Townsend, WA  (qatáy)

>

>

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