New Pub­li­ca­tion by Hawk Moun­tain sci­en­tists shows sea­sonal changes in mi­gra­tion tim­ing

Re­search sug­gests an over­all de­lay across species in most east­ern North Amer­i­can raptors in au­tumn mi­gra­tion pas­sage

Northern Berks Patriot Item - - LOCAL NEWS - From Hawk Moun­tain Sanc­tu­ary As­so­ci­a­tion

Hawk Moun­tain Sanc­tu­ary bi­ol­o­gists pub­lished a new pa­per in col­lab­o­ra­tion with re­searchers in Canada and across the United States that sug­gests global cli­mate change is cre­at­ing long-term shifts in sea­sonal mi­gra­tion tim­ing and the amount of time east­ern North Amer­i­can raptors spend on their breed­ing grounds.

The article, “Long-term phe­no­log­i­cal shifts in mi­gra­tion and breed­ing-area res­i­dency in east­ern North Amer­i­can raptors” was pub­lished in The Auk: Or­nitho­log­i­cal Ad­vances on Sept. 20. Dr. Jean-Fran­cois Ther­rien, the Sanc­tu­ary’s se­nior re­search bi­ol­o­gist, served as lead au­thor with co-au­thors Direc­tor of Long-term Mon­i­tor­ing Dr. Lau­rie Goodrich, Direc­tor of Con­ser­va­tion Sci­ence Dr. Keith Bild­stein, and seven other col­lab­o­ra­tors.

The re­search sug­gests an over­all de­lay across species in most east­ern North Amer­i­can raptors in au­tumn mi­gra­tion pas­sage, which cor­re­lates with an in­crease in tem­per­a­ture. Com­bin­ing those re­sults with ear­lier spring mi­gra­tion data fur­ther sug­gests that most species in this re­gion are in­creas­ing the amount of time they spend on their breed­ing grounds.

Hawk Moun­tain sci­en­tists led the work that used count data from seven North Amer­i­can watch sites, in­clud­ing Hawk Moun­tain Sanc­tu­ary (Kemp­ton, PA), Hawk Ridge (Du­luth, MN), Holiday Beach (On­tario, Canada), Light­house Point (New Haven, CT) Mon­treal West Is­land (Québec, Canada), Mount Peter (War­wick, NY), and Wag­goner’s Gap (Lan­dis­burg, PA).

“The study in­di­cated that since 1985, most raptors spend two ad­di­tional days per decade north of the seven hawk­watch sites. This sup­ports the no­tion that global change may be hav­ing pro­found im­pacts on pop­u­la­tion and ecosys­tem dy­nam­ics in this avian guild,” ex­plained Dr. Bild­stein.

The 2,500-acre Hawk Moun­tain Sanc­tu­ary is the world’s first refuge for birds of prey and is open to the pub­lic year-round by trail­fee or mem­ber­ship, which in turn sup­ports the non­profit or­ga­ni­za­tion’s rap­tor con­ser­va­tion mis­sion and lo­cal-to-global re­search, train­ing, and ed­u­ca­tion pro­grams. To learn more about Hawk Moun­tain and its rap­tor con­ser­va­tion ef­forts, visit www. hawk­moun­

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