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Oke KB, Cunningham CJ, Westley PAH, Baskett ML, Carlson SM, Clark J, Hendry AP, Karatayev VA, Kendall NW, Kibele J, Kindsvater HK, Kobayashi KM, Lewis B, Munch S, Reynolds JD, Vick GK, Palkovacs EP. Recent declines in salmon body size impact ecosystems and fisheries. Nat Commun 2020; 11:4155. [PMID: 32814776 PMCID: PMC7438488 DOI: 10.1038/s41467-020-17726-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 07/15/2020] [Indexed: 11/21/2022] Open
Abstract
Declines in animal body sizes are widely reported and likely impact ecological interactions and ecosystem services. For harvested species subject to multiple stressors, limited understanding of the causes and consequences of size declines impedes prediction, prevention, and mitigation. We highlight widespread declines in Pacific salmon size based on 60 years of measurements from 12.5 million fish across Alaska, the last largely pristine North American salmon-producing region. Declines in salmon size, primarily resulting from shifting age structure, are associated with climate and competition at sea. Compared to salmon maturing before 1990, the reduced size of adult salmon after 2010 has potentially resulted in substantial losses to ecosystems and people; for Chinook salmon we estimated average per-fish reductions in egg production (-16%), nutrient transport (-28%), fisheries value (-21%), and meals for rural people (-26%). Downsizing of organisms is a global concern, and current trends may pose substantial risks for nature and people.
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Affiliation(s)
- K B Oke
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, 95060, USA.
- College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, AK, 99801, USA.
| | - C J Cunningham
- College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, AK, 99801, USA
- Fisheries, Aquatic Science & Technology Laboratory, Alaska Pacific University, Anchorage, AK, 99508, USA
| | - P A H Westley
- College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA.
| | - M L Baskett
- Department of Environmental Science and Policy, University of California, Davis, CA, 95616, USA
| | - S M Carlson
- Environmental Science, Policy, and Management, University of California, Berkeley, CA, 94720, USA
| | - J Clark
- National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, CA, 93101, USA
| | - A P Hendry
- Department of Biology and Redpath Museum, McGill University, Montreal, QC, H3A 2K6, Canada
| | - V A Karatayev
- Department of Environmental Science and Policy, University of California, Davis, CA, 95616, USA
| | - N W Kendall
- Washington Department of Fish and Wildlife, Olympia, WA, 98501, USA
| | - J Kibele
- National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, CA, 93101, USA
| | - H K Kindsvater
- Department of Fish and Wildlife Conservation, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
| | - K M Kobayashi
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, 95060, USA
| | - B Lewis
- Division of Commercial Fisheries, Alaska Department of Fish and Game, Anchorage, AK, 99518, USA
| | - S Munch
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, 95060, USA
- National Marine Fisheries Service, Fisheries Ecology Division, Southwest Fisheries Science Center, Santa Cruz, CA, 95060, USA
| | - J D Reynolds
- Earth to Ocean Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
| | - G K Vick
- GKV & Sons, Contracting to Tanana Chiefs Conference, Fairbanks, AK, 99709, USA
| | - E P Palkovacs
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, 95060, USA.
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