• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Physical Oceanography (PO)
    • View Item
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Physical Oceanography (PO)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

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

    Thumbnail
    View/Open
    AinleyDSRmsFinal.pdf (514.9Kb)
    Date
    2004-08-28
    Author
    Ainley, David G.  Concept link
    Spear, Larry B.  Concept link
    Tynan, Cynthia T.  Concept link
    Barth, John A.  Concept link
    Pierce, Stephen D.  Concept link
    Ford, R. Glenn  Concept link
    Cowles, Timothy J.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/416
    As published
    https://doi.org/10.1016/j.dsr2.2004.08.016
    Keyword
     California Current; Primary productivity; Bioacoustics; Seabird abundance; Seabird foraging; Upwelling fronts 
    Abstract
    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 during the upwelling season 2000. Continuous surveys of seabirds were conducted simultaneously in June (onset of upwelling) and August (mature phase of upwelling) with ocean properties quantified using a towed, undulating vehicle and a multi-frequency bioacoustic instrument (38-420 kHz). Twelve species of seabirds contributed 99% of the total community density and biomass. Species composition and densities were similar to those recorded elsewhere in the CCS during earlier studies of the upwelling season. At a scale of 2-4 km, physical and biological oceanographic variables explained an average of 25% of the variation in the distributions and abundance of the 12 species. The most important explanatory variables (among 14 initially included in each multiple regression model) were distance to upwelling-derived frontal features (center and edge of coastal jet, and an abrupt, inshore temperature gradient), sea-surface salinity, acoustic backscatter representing various sizes of prey (smaller seabird species were associated with smaller prey and the reverse for larger seabird species), and chlorophyll concentration. We discuss the importance of these variables in the context of what factors may be that seabirds use to find food. The high seabird density in the Heceta Bank and Cape Blanco areas indicate them to be refuges contrasting the low seabird densities currently found in most other parts of the CCS, following decline during the recent warm regime of the Pacific Decadal Oscillation.
    Description
    Author Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 52 (2005): 123-143, doi:10.1016/j.dsr2.2004.08.016.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Preprint: Ainley, David G., Spear, Larry B., Tynan, Cynthia T., Barth, John A., Pierce, Stephen D., Ford, R. Glenn, Cowles, Timothy J., "Physical and biological variables affecting seabird distributions during the upwelling season of the northern California Current", 2004-08-28, https://doi.org/10.1016/j.dsr2.2004.08.016, https://hdl.handle.net/1912/416
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      Hydrographic conditions near the coast of northwestern Baja California : 1997–2004 

      Perez-Brunius, Paula; Lopez, Manuel; Pineda, Jesus (2005-05-18)
      The effects of the 1997-98 and 2002-04 El Ni˜no on the upper waters in the con- tinental shelf and slope regions off northwestern Baja California are explored with data from eight cruises taken in late spring from 1998 ...
    • Thumbnail

      CTD profile data from Carbon Flux Explorers deployed 100-500m in the California Current Regime, during the CCE-LTER process study (P1706) between June 2 and July 1, 2017 

      Bishop, James K.B. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-09-30)
      CTD profile data from Carbon Flux Explorers deployed 100-500m in the California Current Regime, during the CCE-LTER process study (P1706) between June 2 and July 1, 2017 For a complete list of measurements, refer to the ...
    • Thumbnail

      Eddy-resolving simulation of plankton ecosystem dynamics in the California Current System 

      Gruber, Nicolas; Frenzel, Hartmut; Doney, Scott C.; Marchesiello, Patrick; McWilliams, James C.; Moisan, John R.; Oram, John J.; Plattner, Gian-Kasper; Stolzenbach, Keith D. (2006-06-13)
      We study the dynamics of the planktonic ecosystem in the coastal upwelling zone within the California Current System using a three-dimensional, eddy-resolving circulation model coupled to an ecosystem/biogeochemistry ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo