Yes, interesting, but not much info in the Science Daily advertizing piece from LSU: the first thing you’d think about casually is gradual human-induced Amazon rainforest degradation leading to poorer or less available food resources in general, accounting for the reduced bird masses. The authors think they controlled for factors other than climate, but when they went into 'pristine rain forest', was this 2 km in from their access point (therefore probably not really pristine) or 200 km in (likely inaccessible)? I readily got to a copy of the original report: https://www.science.org/doi/10.1126/sciadv.abk1743# The study site is 70 km north of Manaus which is on the Rio Negro, and looks to extend in large sampling patches beween ~10 km west of, and 10-30 km east of, what looks like a minor N-S access road or track, at a long term study site. For this site they say "forest cover (has) persisted at >90% with 10 km around the experimental reserve”. This is probably as good as you can get there for “pristine”, with the bird species apparently not migratory and presumably staying local as a bonus. So it looks like a very solid study, to be trusted. ----------------------------------------------- On Nov 16, 2021, at 6:00 AM, John and Nhung <nhungjohn@eastlink.ca<mailto:nhungjohn@eastlink.ca>> wrote: It is interesting. The effects may be more obvious in species with short generation times, where evolution could proceed more rapidly. Guess that may put them in a better position to adapt to rapid environmental changes… Hmm … maybe the insects will win! From: Don MacNeill [mailto:donmacneill@bellaliant.net] Sent: November 16, 2021 5:47 AM To: NaturenNS Subject: [Naturens] Efect of Climate Change on Birds This is an interesting report. Over 40 years of study, researchers have found changes in the masses of birds and wing length that they attribute to climate change. There must be a lot of this going on in other species too. https://www.sciencedaily.com/releases/2021/11/211113072507.htm Don -- Don MacNeill donmacneill@bellaliant.net<mailto:donmacneill@bellaliant.net> _______________________________________________ Naturens mailing list -- naturens@chebucto.ns.ca<mailto:naturens@chebucto.ns.ca> To unsubscribe send an email to naturens-leave@chebucto.ns.ca<mailto:naturens-leave@chebucto.ns.ca>