I made an obvious error in my posting. See the highlighted correction below.
Julian Last year I made charts of the population trends of a number of species from the BBS results for all of the years available—1966 to 2017. The BBS web site now contains results for the years 1966 to 2019. (It’s a separate data set; the 1966 to 2017 set is still available.) I would have assumed that the new results would be exactly the same, but with the addition of the years 2018 and 2019, but they’re not. I’ve checked the data for quite a few species, and, in the 1966 to 2019 data set, the number of birds per BBS route is different for all of the years 1966 to 2017 than it is in the 1966 to 2019 edition. To take just one little example, for Eastern Kingbird in Minnesota, the number per BBS route in 1968 is 5.083706 in the 1966-2017 edition, but 3.77 in the 1966-2019 edition (never mind the fewer decimal places). Obviously, there’s something I don’t understand. Can anyone explain it? ---- Join or Leave mou-net: http://lists.umn.edu/cgi-bin/wa?SUBED1=mou-net Archives: http://lists.umn.edu/archives/mou-net.html During the pandemic, the MOU encourages you to stay safe, practice social distancing, and continue to bird responsibly.
