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Combined climate- and prey-mediated range expansion of Humboldt squid (Dosidicus gigas), a large marine predator in the California Current System

Authors

  • Julia S. Stewart,

    Corresponding author
    1. National Center for Ecological Analysis and Synthesis, University of California at Santa Barbara, Santa Barbara, CA, USA
    2. Hopkins Marine Station of Stanford University, Pacific Grove, CA, USA
    • Correspondence: Present address: J. S. Stewart, National Center for Ecological Synthesis and Analysis, University of California, 735 State Street, Santa Barbara, CA 93101, USA, tel. (805) 882 9218, fax (805) 892 2510, e-mail: jstewart@nceas.ucsb.edu

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  • Elliott L. Hazen,

    1. Environmental Research Division, NMFS Southwest Fisheries Science Center, NOAA, Pacific Grove, CA, USA
    2. Cooperative Institute for Marine Ecosystems and Climate, University of California, Santa Cruz, CA, USA
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  • Steven J. Bograd,

    1. Environmental Research Division, NMFS Southwest Fisheries Science Center, NOAA, Pacific Grove, CA, USA
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  • Jarrett E. K. Byrnes,

    1. Department of Biology, University of Massachusetts Boston, Boston, MA, USA
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  • David G. Foley,

    1. Environmental Research Division, NMFS Southwest Fisheries Science Center, NOAA, Pacific Grove, CA, USA
    2. Cooperative Institute for Marine Ecosystems and Climate, University of California, Santa Cruz, CA, USA
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    • Deceased.
  • William F. Gilly,

    1. National Center for Ecological Analysis and Synthesis, University of California at Santa Barbara, Santa Barbara, CA, USA
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  • Bruce H. Robison,

    1. Monterey Bay Aquarium Research Institute, Moss Landing, CA, USA
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  • John C. Field

    1. Fisheries Ecology Division, NMFS Southwest Fisheries Science Center, NOAA, Santa Cruz, CA, USA
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Abstract

Climate-driven range shifts are ongoing in pelagic marine environments, and ecosystems must respond to combined effects of altered species distributions and environmental drivers. Hypoxic oxygen minimum zones (OMZs) in midwater environments are shoaling globally; this can affect distributions of species both geographically and vertically along with predator–prey dynamics. Humboldt (jumbo) squid (Dosidicus gigas) are highly migratory predators adapted to hypoxic conditions that may be deleterious to their competitors and predators. Consequently, OMZ shoaling may preferentially facilitate foraging opportunities for Humboldt squid. With two separate modeling approaches using unique, long-term data based on in situ observations of predator, prey, and environmental variables, our analyses suggest that Humboldt squid are indirectly affected by OMZ shoaling through effects on a primary food source, myctophid fishes. Our results suggest that this indirect linkage between hypoxia and foraging is an important driver of the ongoing range expansion of Humboldt squid in the northeastern Pacific Ocean.

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