Date: 7/11/20 1:19 pm
From: Robert O'Brien <baro...>
Subject: [obol] Re: Black Storm-Petrel
Any information on hybrids between the two, Roy? I have photos of an
apparent hybrid taken on a pelagic trip out of Tillamook back in around
1980 to 1990. Curious about how common they are. I think I've heard that
hybrid pairs are seeing nesting together in the Hawaiian Islands

On Saturday, July 11, 2020, Roy Lowe <roy.loweiii...> wrote:

> When Lars stared “there at least as many Laysan albatrosses in the world
> as black-footed” he was correct but that does give true picture. The Laysan
> population number is around 1,180,000 birds with 90% nesting in the NW
> Hawaiian Islands while the back-footed world population is around 139,000
> with 95% of them nesting in the NW Hawaiian Islands. Hard to believe we
> don’t see more Laysan offshore here but they just don’t come this way in
> numbers.
> Roy Lowe
> On Jul 11, 2020, at 2:49 AM, larspernorgren <larspernorgren...>
> wrote:
> Actually Black Storm Petrel is far more likely to occur in Oregon than
> Tristam's. It breeds a few hundred miles away in California. It has been
> recorded in Oregon before. All the western Pacific pelagic birds are
> conspicuous in their absence here. There are at least as many Laysan
> Albatrosses in the world as Black- footed yet the latter outnumbers the
> former by three or four orders of magnitude in our waters. Hawaiian petrel?
> Two state records. Wedge-tailed Shearwater? Maybe one state record. When
> ocean conditions are right much of the vertebrate component of the
> ecosystem off Baja California is detectable off the Oregon and Washington
> Coast: mahi mahi and marlin have been caught from charters out of Westport,
> Washington some summers.
> Sent from my Verizon, Samsung Galaxy smartphone
> -------- Original message --------
> From: Jerry Tangren <kloshewoods...>
> Date: 7/10/20 11:19 PM (GMT-08:00)
> To: Torrey G-T <tgagetomlinson...>
> Cc: <obol...>
> Subject: [obol] Re: Black Storm-Petrel
> Yes, I was putting more thought into the two Farallon Island records than
> anything else. Thank you for responding...
> Get Outlook for iOS <>
> ------------------------------
> *From:* Torrey G-T <tgagetomlinson...>
> *Sent:* Friday, July 10, 2020 11:16:35 PM
> *To:* Jerry Tangren <kloshewoods...>
> *Cc:* <obol...> <obol...>
> *Subject:* Re: Black Storm-Petrel
> Jerry,
> I did not initially consider Tristram’s but did briefly look over it when
> considering what other species this bird could have been. As far as I know,
> and according to ORBC and eBird, there aren’t any records of Tristram’s in
> Oregon. Tristram’s has a more pronounced pale carpal bar and less direct
> flight than Black. As far as exotic Storm-Petrels go, my Harrison’s
> Seabirds guide says Markham’s Storm-Petrel is most similar, though that’s a
> pipe dream of a rarity anywhere in the US.
> Torrey
> On Jul 10, 2020, at 10:12 PM, Jerry Tangren <kloshewoods...>
> wrote:
> Wow! Did you consider Tristram’s storm-petrel? It would be just as likely
> off the Oregon coast as a black.
> —Jerry Tangren
> East Wenatchee, WA
> Get Outlook for iOS
> <>
> ------------------------------
> *From:* <obol-bounce...> <obol-bounce...> on behalf
> of Torrey <tgagetomlinson...>
> *Sent:* Friday, July 10, 2020 7:41:21 PM
> *To:* <obol...> <obol...>
> *Subject:* [obol] Black Storm-Petrel
> All,
> After returning home and doing research on Storm-Petrels, a family I have
> limited experience with, I’ve come to the conclusion that the dark rumped
> Storm-Petrel John Sullivan and I saw earlier today was a Black
> Storm-Petrel. Below is my description on eBird of the bird, and the link to
> the checklist.
> I initially saw this bird around 9:30 AM. It was very close to shore
> (~50-100 yards offshore), among the second or third set of breakers and
> flying northwest. I immediately realized that I was looking at a
> Storm-Petrel, an extraordinary bird this close to shore in any case. After
> the bird had flown maybe about 200 yards northeast and was just beyond the
> breakers, John was able to get on it and we followed it as it flew off t o
> the north about half a mile out before it disappeared.
> One would normally expect Fork-tailed Storm-Petrel at this location, but I
> quickly realized that it was much darker than Fork-tailed Storm-Petrel,
> which I've seen a number of times. At this point I began noting the
> fieldmarks of the bird instead of trying to identify a specific species, as
> I have little Storm-Petrel experience beyond Fork-tailed. I have seen Ashy,
> Black and Wilson's once on a pelagic out of San Luis Obispo county, but I'm
> not familiar with any of these species.
> The most obvious fieldmark on this bird was the completely dark rump and
> back. The carpal bar was not prominent as it would be on a Leach's or
> Wilson's Storm-Petrel—not to mention the white rump that is obvious on
> Wilson's and most Leach's Storm-Petrel. I didn't see it close enough to
> discern any color difference that would determine between Ashy and Black.
> Most notable was the lack of pale coloring that stood out on the back and
> the dor sal side of the wings. This bird had a methodical, consistent
> wingbeat that resulted in a smooth and direct flight, unlike the shallow
> erratic flight of Ashy or springy Nighthawk-like flight of Leach's. It
> dropped down in the water for no more than several seconds about three
> times as it flew along. At this point it had flown too far to observe it
> down in the water. When it was approximately a quarter mile offshore, it
> briefly flew among a flock of Red-necked Phalarope, which provided a good
> point of reference. This Storm-Petrel had noticeably longer wings than the
> Phalarope (which have a wingspan of 15 inches, ASSP wingspan of 18 inches,
> LESP 20 and BLSP 22).
> These fieldmarks led us to the conclusion that this bird was most likely a
> Black Storm-Petrel. However, both John and I were hesitant to call it
> before we had done research beyond what we were capable of doing on phones
> with spotty coverage. After reading several in depth descriptions of Black,
> Ashy and Leach's Storm-Pe trels, and viewing images and videos of all three
> in flight, I concluded that this bird was indeed a Black Storm-Petrel.
> *It should be noted that a large percentage of Leach's Storm-Petrel that
> breed on Isla Coronado, Isla de San Benito and Isla Guadalupe off the coast
> of Baja California exhibit predominantly dark rumps compared to the light
> rumped population in the Northern Pacific and Atlantic Oceans (Ainley,
> 1980). It would seem an even rarer occurrence to see a dark rumped Leach's
> Storm-Petrel off the Oregon coast than it would a Black Storm-Petrel.
> However, I imagine that the distribution of dark rumped Leach's
> Storm-Petrels is likely not something that has been extensively researched
> and is, needless to say, not a top priority in the ornithological
> community. This being said, I eliminated this species based off of the
> smooth flight pattern of BLSP and the obvious carpal bar present in LESP
> that was lacking in this bird.
> I will submit to ORBC. This is the 7th stat e record, should it be
> accepted.
> Best,
> Torrey
> Torrey Gage-Tomlinson
> Biological Sciences
> <tgagetom...>
> Contact moderator:
> <obol-moderators...>

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