Výsledky vyhledávání - "Larry B. Spear"

Flight speed of seabirds in relation to wind speed and direction

Publikováno v: Ibis. 139:234-251

We studied flight speed among all major seabird taxa. Our objectives were to provide further insight into dynamics of seabird flight and to develop allometric equations relating ground speed to wind speed and direction for use in adjusting seabird de

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9af36ba6aacf90c5cf32cb38cc21f173
https://doi.org/10.1111/j.1474-919x.1997.tb04621.x

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Flight behaviour of seabirds in relation to wind direction and wing morphology

Autor: Larry B. Spear, David G. Ainley

Publikováno v: Ibis. 139:221-233

We studied flight direction relative to wind direction (hereafter referred to as “flight direction”), the relation between wing morphology and flight behaviour and interspecies relationships in flight behaviour among all major seabird taxa. We ca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::47ac9811d1a6372fee4e9ebd507af936
https://doi.org/10.1111/j.1474-919x.1997.tb04620.x

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At-sea distributions and abundance of tropicbirds in the eastern Pacific

Autor: Larry B. Spear, David G. Ainley

Publikováno v: Ibis. 147:353-366

During spring and autumn 1980-95, we surveyed Red-tailed Phaethon rubricauda, White-tailed P. lepturus and Red-billed Tropicbirds P. aethereus at sea in the Pacific between the coast of the Americas and 176°W. For the Pacific, we had complete covera

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::70ff5ee18a04e78cecc557fec00bf4c6
https://doi.org/10.1111/j.1474-919x.2005.00411.x

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Cetacean distributions relative to ocean processes in the northern California Current System

Autor: Cynthia T. Tynan, Larry B. Spear, David G. Ainley, Stephen D. Pierce, John A. Barth, Timothy J. Cowles

Publikováno v: Deep Sea Research Part II: Topical Studies in Oceanography. 52:145-167

Associations between cetacean distributions, oceanographic features, and bioacoustic backscatter were examined during two process cruises in the northern California Current System (CCS) during late spring and summer 2000. Line-transect surveys of cet

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e769de886cbdb4d3a6e08b2d044daba1
https://doi.org/10.1016/j.dsr2.2004.09.024

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Physical and biological variables affecting seabird distributions during the upwelling season of the northern California Current

Autor: Stephen D. Pierce, Cynthia T. Tynan, David G. Ainley, R. Glenn Ford, Timothy J. Cowles, John A. Barth, Larry B. Spear

Publikováno v: Deep Sea Research Part II: Topical Studies in Oceanography. 52:123-143

As a part of the GLOBEC-Northeast Pacific project, we investigated variation in the abundance of marine birds in the context of biological and physical habitat conditions in the northern portion of the California Current System (CCS) during cruises d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0c937750ebc0dc325dcc0cf060527c82
https://doi.org/10.1016/j.dsr2.2004.08.016

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Forster’s Tern, Caspian Tern, and California Gull Colonies in San Francisco Bay: Habitat Use, Numbers and Trends, 1982-2003

Autor: Robin E. Dakin, Larry B. Spear, Thomas P. Ryan, Cheryl M. Strong

Publikováno v: Waterbirds. 27:411-423

We analyzed data on numbers and annual trends of breeding terns and gulls based on censuses of all colonies of the Caspian Tern (Sterna caspia), Forster’s Tern (S. forsteri) and California Gull (Larus californicus) in the San Francisco Bay estuary

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3112c8efbf48c29d690526fe90d91425
https://doi.org/10.1675/1524-4695(2004)027[0411:ftctac]2.0.co

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Response of seabirds to thermal boundaries in the tropical Pacific: the thermocline versus the Equatorial Front

Autor: David G. Ainley, Lisa T. Ballance, Larry B. Spear

Publikováno v: Marine Ecology Progress Series. 219:275-289

Our 10 yr study is the first to associate seabirds with oceanic boundaries, or fronts, in tropical oceans. It addresses the semi-permanent Equatorial Front, hereafter 'front', a vertical bound- ary lying between the South Equatorial Current (SEC) and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::22d2b1952c2f765d9e468fe9f209919c
https://doi.org/10.3354/meps219275

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Variable responses of seabirds to change in marine climate: California Current, 1985-1994

Autor: Larry B. Spear, C. S. Oedekoven, David G. Ainley

Publikováno v: Marine Ecology Progress Series. 212:265-281

We conducted annual ship-board surveys to determine the density and distribution of seabirds off central California in relation to marine climate, from 1985 to 1994. Summarized here are results for the sooty shearwater Puffinus griseus, the common mu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a137e7fc087830ffb3a651bf7db0ea7
https://doi.org/10.3354/meps212265

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