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.

Issue link: http://nab.aba.org/i/778845

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N O R T H A M E R I C A N B I R D S 486 N O R T H E R N C A L I F O R N I A only since 2011. This season, at least three nests were present in a former Mountain View, Santa Clara salt pond 6 Jun+ (MMR, MJM, RGJ), in - cluding one built on an old hunting blind. A cruise on 12 Jul produced a Hawaiian Petrel off Humboldt and 8 Ashy Storm-Petrels (3 off Del Norte and 5 off Mendocino; Jeff Gilligan, Owen Schmidt). A Manx Shearwater was seen from Moss Beach, San Mateo 31 Jul (RSTh); we aver - age 1-2 each summer. The sulid trio of North- ern Gannet, Blue-footed Booby, and Brown Booby was once again recorded at F.I.; a Blue- footed was seen 19-30 Jul, up to 5 Brown Boo - bies were present throughout the period (with the high of 5 on 4 Jun), and the gannet was ob - served sporadically both at F.I. and at Alcatraz Island, S.F. (Point Blue, m.ob.). Otherwise, the only booby was a Brown at Half Moon Bay, San Mateo 26 Jun (MDeF). A Brandt's Cormorant at Miller/Knox R.S. 11 Jul (LKh, CDu) provided Contra Costa's first summer record since 2008. American White Pelicans are scarce in most coastal areas; concentrations of 90+ at Bodega Harbor, Sonoma 3 Jun (Len Blumin), 280 at Struve Slough, Santa Cruz 18 Jul (DSy), and up to 200 at Elkhorn Slough, Monterey throughout the period (m.ob.) were unusually large. One was at Roberts Lake, Monterey 22 Jul (ph. SLn, ph. RC, DR); there are fewer than 10 Monterey Peninsula records. A Brown Pelican at West Sac - ramento 12 Jun (Aaron Haiman) provided one of few Yolo records. BITTERNS THROUGH CRANES Least Bitterns continued to be reported in above-average numbers. Up to 2 continued at Las Gallinas, Marin through the period (ph. m.ob.), one continued at Campbell Cove, So - noma through 30 Jun (DN, JLx, m.ob.), up to 3 continued at Yolo Bypass W.A., Yolo 29 Jun–19 Jul (ph. m.ob.), and one was found again at Mather Lake, Sacramento 12 Jun (Phil Lutz). In addition, up to 3 birds were found at Clear Lake 13 Jun–24 Jul (Greg Guisti, Brad Barn - well), the first found in Lake in two years. Marin's Black Vulture was seen again over Chimney Rock at P.R.N.S. 18 Jul (ph. Carlo Arreglo). Bald Eagles nested at Crystal Springs Reservoir, San Mateo for the third year in a row, successfully raising 2 young this year. An unseasonable Broad-winged Hawk heading n. over P.R.N.S. 4 Jun (ph. DSg) apparently pro - vided the first summer record for the Region. Swainson's Hawks nested successfully again near the Napa County Airport, Napa (one fledgling at nest 31 Jul; MBe) and along Coy - ote Creek at Coyote, Santa Clara (one nearly fledged nestling 16-24 Jul; WGB, RPh). Up to 4 Yellow Rails were found again s. of Eagle Lake, Lassen 7 Jun–4 Jul (m.ob.). Black Rails continued to be found along Alviso ently benefitted the local food web, which also brought Sooty Shearwaters, Elegant Terns, and Sabine's Gulls to nearshore areas in unusually large numbers. Notable rarities this season in - cluded the continuing Black Vulture, a Curlew Sandpiper, and a Little Stint. Significant breed - ing records included the southernmost breed- ing by Harlequin Ducks in North America. WATERFOWL THROUGH PELICANS Brant inside S.F. Bay included 4 at Brooks Island, Contra Costa 27 Jul (LKh, CDu), where they have been fairly regular in recent years, as well as single birds at Aquatic Park, S.F. 10 Jul (ph. Car - lo Arreglo) and Coyote Point, San Mateo 24-28 Jul (RSTh, AME). Two green-collared Trumpeter Swans from the introduced Oregon population found s. of Alturas, Modoc 15 Jul (SCR) provided only the second summer record for the Region; might pairs from that population eventually breed in California? A very late Eurasian Wigeon lingered from spring at Arcata Marsh, Humboldt through 3 Jun (m.ob.). Two female Ring-necked Ducks with about 14 ducklings near Truckee 7 Jul (ph. WGB) were thought to provide the first breeding record for Nevada. A single Hooded Merganser duckling with them was likely a re - sult of egg dumping. Lesser Scaup bred again at H.R.S., with the first downy young noted 5 Jul (RJR), but no breeding evidence was noted in Santa Clara for the second year in a row. A fe - male Harlequin Duck with 5 ducklings along the San Joaquin River near Balloon Dome 11 Jul (Ian Allison, ph. Kearey Allison) provided only the second breeding record for Madera, and the first in 91 years! This likely constitutes the southern - most breeding location for North America and presumably the world. Unseasonable scoters in - side S.F. Bay (all in San Mateo) included a White- winged at Redwood City 21 Jun (female; RSTh), another at Coyote Point 29 Jun (male; ph. Gena Zolotar), and a Black at the latter location 5 Jul (male; ph. Warren & Marilyn Regelmann). Un - usual far inland, and especially so in summer, an ad. male Red-breasted Merganser stayed at Bridgeport Reservoir, Mono 19 Jun–6 Jul (PJM et al., ph. RCP). A Red-throated Loon at Lexington Reservoir lingered from spring through 2 Jun (MMR), furnishing Santa Clara with its first summer re - cord. A concentration of 150 Pied-billed Grebes at Clifton Court Forebay 27 Jul (LKh, CDu) provided one of the highest counts ever for Con - tra Costa. Rare summer Horned Grebes were at Crowley Lake, Mono 15 Jun (CMc), Mountain View, Santa Clara 16 Jun (Jasen Liu), and Eagle Lake, Lassen 28 Jul (DPA). Eared Grebes nested again at H.R.S., where they have bred each year since 1999 (RJR); this is the most regular S.F. Bay-area breeding location. In contrast, bayside nesting by Clark's Grebes has been documented Jeff N. Davis (Madera), Malia DeFelice, Al DeMartini, Bruce E. Deuel (n. C.V. counties), Scott Dietrich, Ryan DiGaudio, Colin P. Dill - ingham (Plumas and Sierra), Matthew Dod- der, Peggy L. Don, Jon L. Dunn, Pete Dunten, Todd Easterla, Elias Elias, Andrew Engilis, Paul Fenwick, Eric Feuss, Brian Fitch, Leslie Flint, Rick Fournier (RF), Rob Fowler (RbF; Humboldt and Del Norte), Rob Furrow (RFu), John Garrett, Steve Gerow (Santa Cruz), John Harris (Stanislaus), Karen Havlena (Mendoci - no), Chris Hayward, Alan S. Hopkins, Debbie House, Lisa Hug, John E. Hunter (Trinity), Al - varo Jaramillo, Richard G. Jeffers, Logan Kahle (Contra Costa), Robert J. Keiffer (Mendocino), Gary Kittleson, Tony Kurz, Alexandra Lamb, Jim Laughlin, Paul E. Lehman, Robin L. C. Leong (Solano), Gary S. Lester, Lauren P. Les - ter, Nick Levendosky, Jim Lomax, John S. Lu- ther, Michael J. Mammoser, Don Marsh, Dan J. Maxwell (Marin), Sean McAllister, Chris Mc - Creedy, Tristan McKee, Peter J. Metropulos (San Mateo), Dominik Mosur (San Francisco), Martin Meyers, Dan Nelson, Kristie N. Nel - son (Mono), Frances Oliver (San Joaquin), Ed Pandolfino (Placer), Ryan Phillips, Eric Pilotte, Linda Pittman, Gary W. Potter (Fresno), Ron Pozzi, Peter Pyle, Bernadette Ramer, Robert Ramer, Harold M. Reeve, Robert J. Richmond (Alameda), Michael Rieser, Alex M. Rinkert, Don Roberson (Monterey), Michael M. Rog - ers (MMR), Michael Rogner (MRg), Stephen C. Rottenborn, Steve Rovell, Ruth A. Rudesill (Sonoma), Paul Saraceni, Adam Searcy, Jeff Seay (Kings), Doug Shaw, Daniel Singer, Mark Stacy, John C. Sterling (Modoc, Alpine, Calav - eras, and Yolo), Fritz Steurer, Tim Steurer (El Dorado and Amador), Steve J. Stump, Steven D. Summers (Tulare), Michele Swartout, Ron - ald S. Thorn, Jim Tietz (F.I.), John Trochet, Steve Umland (Tuolumne), Frank Vanslager, Chuck E. Vaughn, Ann Verdi, Kent Van Vu - ren (Merced), Dave Weber, Liz West, Jerry R. White (Lake), David G. Yee, Bob & Carol Yutzy (Shasta). Many more observers are not specifically cited; all are appreciated. –––––––––––––––––––––––––––––––––––––– SUMMER –––––––––––––––––––––––––––––––––––––– N earshore sea surface temperatures were above average in June and near record-high values in July. At South - east Farallon Island, breeding success by most seabird species was about average, despite re - duced numbers and a delayed start to breed- ing. Warm-water conditions are usually asso- ciated with reduced seabird breeding success, but strong upwelling in early spring appar -

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