Nonresident seabirds forage along the continental shelf break in Central California

January 25, 2017, Public Library of Science
Nonresident seabirds forage along the continental shelf break in Central California. Credit: Sophie Webb (Point Blue/NOAA-ONMS/ACCESS)

Nonresident seabirds in Central California concentrate their foraging along the continental shelf break, according to a study published January 25, 2017 in the open-access journal PLOS ONE by Anna Studwell who has worked jointly with colleagues at Point Blue Conservation Science, the SFSU Department of Geography & Environment, and the Romberg Tiburon Center, USA.

Seabird aggregations in the ocean are associated with concentrations of prey, and so have been used to identify and designate worldwide. Central California is a highly-used foraging area for seabirds, and most species that breed locally are constrained to islands near the coast. To identify high-use foraging sites for nonresident seabirds—those that do not breed locally—Studwell and colleagues used a 10-year dataset that included seabird counts and oceanographic information. The researchers focused on six nonresident seabird species: Phoebastria nigripes (black-footed albatross), Ardenna griseus (sooty shearwater), Ardenna creatopus (pink-footed shearwater), Fulmarus glacialis (northern fulmar), Phalaropus lobatus (red-necked phalarope) and Phalaropus fulicarius (red phalarope).

The researchers found that for nonresident seabirds, the highest use foraging area, and a site of high conservation priority when considering the species' IUCN Red List status, is along the continental shelf break, particularly near Cordell Bank. The lack of protected offshore areas has been called the "missing dimension in ocean conservation," say the researchers, and this work provides a way to prioritize areas that are high use for multiple seabird species. Notably, combining resident and nonresident seabird areas could help identify critical marine and further inform conservation efforts.

Explore further: Global trends show seabird populations dropped 70 percent since 1950s

More information: Studwell AJ, Hines E, Elliott ML, Howar J, Holzman B, Nur N, et al. (2017) Modeling Nonresident Seabird Foraging Distributions to Inform Ocean Zoning in Central California. PLoS ONE 12(1): e0169517. DOI: 10.1371/journal.pone.0169517

Related Stories

Underwater terrain may be key factor in little auk foraging

July 20, 2016

Little auks forage in the same areas off East Greenland—the continental shelf and its edge—regardless of whether sea ice is present or absent, according to a study published July 20, 2016 in the open-access journal PLOS ...

Scientists predict where seabirds forage

February 7, 2012

Researchers have used information about seabird colonies and food availability to create a mathematical model which predicts where they forage for food during the breeding season.

Bacteria control levels of dangerous pollutant in seabirds

December 16, 2016

Despite ongoing global pollution, researchers have discovered that levels of mercury in seabirds off the coast of B.C. have remained relatively stable over the past 50 years. Surprisingly, mercury in seabirds is now actually ...

Recommended for you

Packing a genome, step-by-step

January 18, 2018

Genome folding now has a playbook. A new step-by-step account spells out in minute-time resolution how cells rapidly pack long tangles of chromosomes into the tiny, tightly wound bundles needed for cell division. Cells reel ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.