North American Birds

VOLUME 69 NO3 2016

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

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327 V O L U M E 6 9 ( 2 0 1 6 ) • N U M B E R S 3 / 4 P E L A G I C B I R D S F R O M C R U I S E S H I P S A LO N G T H E PA C I F I C C O A S T terey (35.56° N, 122.19° W) 26 Oct 2012. STREAKED SHEARWATER (Calonectris leucomelas) A record of 1 seen 80 km off Tillamook, OR 24 Sep 2013 was accepted by the Oregon Bird Records Committee, the second record for the state, but a report of 1 ca. 75-80 km off Lin - coln, OR 17 Sep 2000 was not accepted. One reported 76 km west of Point Reyes, Marin, CA 27 Sep 2011 was not accepted by the California Bird Records Committee. BULLER'S SHEARWATER (Ardenna bulleri) Primarily a fall visitor, most birds are seen be - tween mid-August and late October or early November, sometimes to mid-November (Briggs et al. 1987, Roberson 2002, Wahl et al. 2005). This species occurs in variable numbers, being fairly common most years (occasionally common), but very uncommon to rare during others. It is rare to uncom - mon in Alaska waters. Most individuals are found seaward of the shelf break, particularly along the warmer sides of temperature fronts, which might explain their irregular occur - rence close to shore (Briggs et al. 1987). Very unusual was an exceptionally early individual 79 km off Douglas, OR (43.92° N, 125.14° W) 8 Jun 2013—a record-early arrival for the state. There are records as early as late May off British Columbia (Kenyon et al. 2009) and mid-June off Washington (Wahl et al. 2005) and Monterey, CA (Roberson 2002). Small numbers often appear by late July, e.g., 82 km southwest of the southern tip of Haida Gwaii 31 Jul 2013; 66 km off southern Humboldt , CA 16 Jul 2014; and 9 off Curry, OR 20 Jul 2015; and early August reports include 12 between Coos, OR and Humboldt 7 Aug 2013; 1 off Curry, OR 1 Aug 2015; and 68 between Lane, OR and Humboldt 9 Aug 2015. The high cruise count in fall was 350 off Pacific, WA 1 Oct 2012. A very high total for Alaska waters was 200+ birds between 25 km off Herbert Graves Island and 8 km off the mouth of Cross Sound 18 Sep 2011. A total of 45 birds was noted between Lincoln, OR and Del Norte, CA 10 Nov 2015, and a sur - prising 28 late birds were 85-100 km offshore between Lane, OR and Pacific, WA (21 in Or - egon, 7 in Washington) 2 Dec 2015 (Figure 15)—a warm-water year. SHORT-TAILED SHEARWATER (Ardenna tenuirostris) Spring cruises occur too late in the season to record this species with any regularity, and Obispo and Mendocino, CA, with smaller num - bers regular south to Santa Barbara and north to Humboldt. Many cruises recorded only small numbers up to, for example, a total of 17 found between Monterey and San Francisco 29 Apr 2014 and 15 birds between Santa Bar - bara and Monterey 6 May 2015. Much larger counts were a total of 232 birds between San Luis Obispo and Mendocino 30 Apr 2010, 300+ between Santa Barbara and San Mateo (almost all off San Luis Obispo and Monterey) 7 May 2014 (Figure 14), and 170 between Santa Barbara and southern Humboldt 24–25 Apr 2016. Rare north of Humboldt, with singles off Del Norte, CA 8 May 2009, 30 Jul 2013, and 13 May 2015; and some five cruise records of single birds off southern Oregon (Curry and Coos)—where the species will likely prove to occur somewhat regularly: at 42.95° N, 125.13° W on 17 Apr 2012; at 42.21° N, 125.06° W on 16 Apr 2013; 42.85° N, 125.27° W on 3 May 2013; at 42.34, 125.11° W on 22 May 2014, with a total of 5 birds there 12 Jul 2015 (Figure 15). Farther north, singles were 94 km off Depoe Bay, Lincoln (45.04° N, 125.22° W) 21 May 2014 and 193 km off Cape Arago, Coos (43.95° N, 126.62° W) 1 Aug 2015. Fall cruise reports for Oregon waters in - volved 1 seen 65 km west of Coos Bay, Coos 20 Sep 2005, singles 80 km (43.88° N, 125.16° W) and 76 km (43.72° N, 125.15° W) off Winchester Bay, Douglas and 1+ off Coos/Curry all on 31 Aug [not 23 Aug as published in Oregon Birds] 2009; 1 off Coos 22 Sep 2009; 1-3 birds off southern Curry 25 Sep 2012; 2 ca. 149-154 km off Curry 29 Aug 2013; and 2 ca. 90 km off Depoe Bay, Lincoln (44.94° N, 125.20° W) 18 Oct 2014. This species is known to occur through the late autumn off California (Pyle 2006), but fall cruises have recorded few. Singles were off San Francisco 18 Sep 2007 and 93 km off Rocky Point, Monterey 27 Sep 2011, 8 were 77 km off Trinidad, Humboldt 25 Oct 2012, and 1 was 75 km off Cape San Martin, Mon - off Cape Arago, Coos (43.86° N, 126.58° W to 43.87° N, 126.59° W) 1 Aug 2015; sin - gles were 78 km off Winchester Bay, Douglas (43.83° N, 125.16° W) and 71 km off Cape Arago (43.64° N, 125.15° W) 9 Aug 2015; and 1 was 58 km off Cape Arago (43.62° N, 124.98° W) 20 May 2016. In Washington wa - ters, 1 was 268 km off Ocean Shores Grays Harbor (46.45° N, 127.62° W) 25 May 2014. Off British Columbia, singles were found 213 km southwest of the Brooks Peninsula, Van - couver Island (49.23° N, 130.51° W) 11 Jul 2013; ca. 238 km south-southwest of Estevan Point, Vancouver Island (47.50° N, 128.10° W) 25 May 2014; 318 km southwest of Este - van Point (47.10° N, 129.15° W) 8 Jul 2014, and much closer to shore than usual 27 km southwest of the Brooks Peninsula (49.91° N, 128.13° W) 19 May 2015. Most previous re - cords off British Columbia had come during at-sea surveys in waters beyond the Canadian EEZ, between June and September (Kenyon et al. 2009). Fall repositioning cruises commence in September, after Hawaiian Petrel numbers have begun to decline, and the only such reports were of single birds off "central Cali - fornia" 24 Sep 2014 and ca. 47 km off Point Conception, Santa Barbara, CA 29 Sep 2015. This species has been found into late Septem - ber during non-cruise pelagic trips, and as late as 19 Oct 1986 some 500 km off Oregon (Pyle et al. 1993). COOK'S PETREL (Pterodroma cookii) Irregular in occurrence from year to year, even from week to week, Cook's Petrel may be occasionally numerous, though typically very uncommon, and some years absent. This species has been found off California dur - ing almost every month of the year. But the largest numbers of birds have been found off central California during NOAA surveys and single-day pelagic trips in spring and, espe - cially, summer (July–August)—with a high non-cruise count of 3000+ at the Davidson Seamount, Monterey 24 Jul 2010 (P. Pyle, in litt.)—when cruises through these waters are lacking. Cook's Petrel was recorded through - out the cruise period, with the largest num- bers in late April and early May (Table 4). Earliest were 4 birds 36-63 km off Sonoma and Mendocino, CA (2 at 38.21° N, 123.79° W; singles at 38.45° N, 123.91° W and 38.73° N, 124.06° W) 20 Mar 2015; and 1 off Marin, CA 1 Apr 2016. These observations correspond with the earliest cruise dates. The largest numbers were found between San Luis Table 4. Numbers of Cook's Petrels seen from cruise ships by month, 2005-2016. Observer coverage was heavily skewed to April and May, with a secondary peak during September. –––––––––––––––––––––––––––––––––––––––––––– March 4 |||||| August 8 –––––––––––––––––––––––––––––––––––––––––––– April 477 |||||| September 7 –––––––––––––––––––––––––––––––––––––––––––– May 510 |||||| October 11 –––––––––––––––––––––––––––––––––––––––––––– June 0 |||||| November 0 –––––––––––––––––––––––––––––––––––––––––––– July 6 |||||| December 0 ––––––––––––––––––––––––––––––––––––––––––––

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