Abstracts of Papers to Be Presented at the 1955 Winter Meeting on the Pacific Coast at Los Angeles, California (Corresponding toBulletin of the American Physical Society, Volume 30, No. 8)

1955 ◽  
Vol 100 (6) ◽  
pp. 1790-1790
Author(s):  
Anonymous
Western Birds ◽  
2021 ◽  
Vol 52 (4) ◽  
pp. 322-339
Author(s):  
Ryan S. Terrill ◽  
Christine A. Dean ◽  
John Garrett ◽  
Daniel J. Maxwell ◽  
Lauren Hill ◽  
...  

Avian migration is a spectacular phenomenon, representing the annual movements of billions of birds globally. Because the greatest diversity and numbers of birds migrate at night, opportunities to observe active migration are rare. At a number of localities in North America, however, observers can quantify movements of many typically nocturnal migrants during daylight where they continue after dawn. Such locations have provided much information about species-specific phenology, status, and orientation during migration. Localities where morning flights of land birds can be observed are unevenly distributed, however, and are little reported along the Pacific coast. Here we describe a novel location for the observation of spectacular morning flights of nocturnal migrants during spring migration at Bear Divide, in the western San Gabriel Mountains, Los Angeles County, California. In two years of informal surveys at the site, we have recorded at least one morning with an estimated ~13,500 individual birds passing. Our preliminary analyses suggest that the peak of a species’ migration at Bear Divide is correlated with the latitude of a species’ breeding, being later in the spring as that latitude increases. Our data from Bear Divide provide an independent perspective on migration as quantified by local radar. Further work at this locality may help inform our knowledge of migration phenology and population trends.


1985 ◽  
Vol 63 (10) ◽  
pp. 1779-1784 ◽  
Author(s):  
Christopher S. Lobban

Species of marine tube-dwelling diatoms have been identified from fresh collections made along the Pacific coast of the United States and from herbarium material originating from the Aleutian Islands to Baja California. The major species have three geographic ranges. Berkeleya rutilans is common throughout the region. Navicula pseudocomoides is common as far south as Point Conception (as are one or more species of Navicula sect. Lineolatae, not treated here). Less common in this region is Navicula delognei. Nitzschia fontifuga was found as a sporadic cohabitant of tube-forming species, especially B. rutilans. Berkeleya hyalina is a warm-water species, extending as far north as Los Angeles. Rarer tube-forming species include Haslea crucigera, Berkeleya fragilis, and B. micans.


Reviews: Mexicans, Mormons, Miners and Manifest Destiny - Walter Sheppe (editor). First Man West. Alexander Mackenzie's Journal of His Voyage to the Pacific Coast of Canada in 1793. (Berkeley & Los Angeles: University of California Press, 1962; C.U.P., 60s.) pp. viii, 366. - Frederick S. Dellenbaugh, A Canyon Voyage. The Narrative of the Second Powell Expedition down the Green-Colorado Rivers from Wyoming and the Explorations on Land in the Years 1871 to 1872, (with a foreword by William H. Goetzmann). (New Haven & London: Yale Western Americana Paperbound, 1962, 15s.) pp. xxxvi, 267. - John A. Hawgood (editor), First and Last Consul. Thomas Oliver Larkin and the Americanization of California. (San Marino: The Huntington Library, 1962, $5.00.) pp. xxxviii, 123. - Stella M. Drumm (editor), Down the Santa Fe Trail and into Mexico. The Diary of Susan Shelby Magoffin 1846–47, (with a foreword by Howard R. Lamar), (New Haven & London: Yale Western Americana Paperbound, 1962, 15s. ) pp. xxv, 294. - Erwin G. Gudde (editor), Bigler's Chronicle of the West. The Conquest of California, Discovery of Gold, and Mormon Settlements as Reflected in Henry William Bigler's Diaries, (Berkeley & Los Angeles: University of California Press, 1962; C.U.P., 40s. ) pp. xiv, 145. - David M. Potter (editor), Trail to California. The Overland Journal of Vincent Geiger and Wakeman Bryarly. (New Haven & London: Yale Western Americana Paperbound, 1962, 12s. 6d.) pp. xvii, 266. - Robert G. Athearn, Rebel of the Rockies. A History of the Denver & Rio Grande Western Railroad. (New Haven & London: Yale Western Americana Series, 1963, 72s.) pp. XV, 395.

Author(s):  
W. D. McIntyre

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