<div dir="ltr">Wow, thanks. I did not know that was so easily available. <div>As a test I just compared Rufous vs. Anna's Hummingbirds</div><div>No great surprise that Anna's are on the increase, most especially around urban areas. SeaTac and then PDX</div><div>Sadly Rufous is the reverse-strong decrease everywhere. I have certainly observed this here SE of Portland over the last 50 years.</div><div>I could describe further, but very easy for interested birders to check for themselves</div><div><br><div>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.?</div><div>Thanks again, Bob OBrien Portland</div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 14, 2023 at 1:16 PM Steve Hampton <<a href="mailto:stevechampton@gmail.com">stevechampton@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)">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. </div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)"><br></div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)">To see them, go to <b>eBird</b>, click the <b>Science </b>tab, then <b>Status & Trends</b>, and then type in a species name. </div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)"><br></div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)">It defaults to the <b>Abundance </b>map, which is a basic range map color coded for abundance -- by season. You can then click on <b>Trends </b>and see the red, white, and blue dots. If you hover over them, the detailed trend appears. </div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)"><br></div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)">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). </div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)"><br></div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)">These are wonderful maps -- each dot on each map is like a survey of its own. </div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)"><br></div><div class="gmail_default" style="font-size:large;color:rgb(7,55,99)"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 13, 2023 at 2:01 PM Alan Roedell <<a href="mailto:alanroedell@gmail.com" target="_blank">alanroedell@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Interesting article. My impression after living in Seattle for 80 years, is that most species have declined. Crows and accipiters buck the trend.<div dir="auto">I miss the swallows most.</div><div dir="auto">Alan, Seattle </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 13, 2023, 12:52 PM Dan Reiff <<a href="mailto:dan.owl.reiff@gmail.com" target="_blank">dan.owl.reiff@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<a href="https://phys.org/news/2023-08-machine-learning-method-population-trend-bird.html" rel="noreferrer noreferrer" target="_blank">https://phys.org/news/2023-08-machine-learning-method-population-trend-bird.html</a><br>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div><font size="4" color="#073763"><span></span>Steve Hampton<span></span></font></div><div>Port Townsend, WA (<span style="color:rgb(0,0,0);font-family:verdana,arial,sans-serif;font-size:13px">qatáy</span>)</div></div><br><div><font color="#073763"><i><br></i></font></div></div></div>
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