Update on shearwater mortalities

26 08 2015

Reports of dead shearwaters continue to come in from both Seanetters and non-SEANET affiliated folks. All summer, this has been a decidedly northern phenomenon; of the 16 Greater Shearwaters reported to SEANET, three were found in North Carolina, and all the rest were spotted between Long Island and Provincetown at the tip of Cape Cod. We have also received word of dead shearwaters from National Parks Service personnel, wildlife rehabilitators, and members of the public. We even had a shearwater banded in Spain (!) turn up dead on a beach in Winthrop, Massachusetts. Thanks to Susannah Corona for that report, and I will share with you the history on that bird when I hear back from the European banding lab.

I had planned to post a Dead Bird Quiz today, so I will throw in a shearwater themed one amidst this post. Easy peasy for you Dead Bird Identifiers extraordinaire, but humor me.

What kind is this? (Found on Long Island)

What kind is this? (Found on Long Island)

And this one? (Found by J. Powell in NC)

And this one? (Found by J. Powell in NC)

How's about this guy? (Found by T. Lee, brand new volunteer in NC!)

How’s about this guy? (Found by T. Lee, brand new volunteer in NC!)

We know that summer shearwater mortality is a fairly typical phenomenon, though the magnitude does vary year to year. Last year was extremely quiet on the shearwater front, with only four reported to SEANET, and nothing that raised anyone’s eyebrows outside SEANET either. This year is rather a different situation. Fifteen Greater Shearwaters were found on beaches in Eastham, Massachusetts alone, with perhaps a total of another dozen birds found on various other beaches on the ocean side of Cape Cod.¬†Several agencies and non-profits have collected carcasses, so we may have some necropsy results by fall. If nothing else, we can get a glimpse into the general body condition and stomach contents of these birds.

In some of the back and forth on email amongst wildlife biologists, veterinarians, rehabbers and seabird researchers, this request was put forward by Kevin Powers: “I would recommend that the napes of the necks of any Great Shearwater cadavers be photographed because there is some limited ability to age birds to their 3rd year based on the amount of brown feathers on the nape using Peter Pyle’s Handbook to North American Birds (Vol 2). I would be more than willing to participate.” Any of you who find these birds, whether on a SEANET walk, or just while out and about, please do consider taking a photo as Kevin described. It could get us a little closer toward understanding the demographics (zoographics?) of this die-off.

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3 responses

26 08 2015
capteagleeyes

Bird A= Greater, Bird B=Sooty Bird C=Cory’s

26 08 2015
John Stanton

Agree:

Bird A; Great Shearwater.
Bird B Sooty Shearwater.
Bird C: Cory’s Shearwater.

26 08 2015
Edward

A Great Shearwater
B Sooty Shearwater
C Cory’s Shearwater race borealis (Atlantic from). Note the limited white on the underwing.

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