Transhemispheric ecosystem disservices of pink salmon in a Pacific Ocean macrosystem

Proceedings of the National Academy of Sciences of the United States of America
Alan M SpringerEric J Woehler

Abstract

Pink salmon (Oncorhynchus gorbuscha) in the North Pacific Ocean have flourished since the 1970s, with growth in wild populations augmented by rising hatchery production. As their abundance has grown, so too has evidence that they are having important effects on other species and on ocean ecosystems. In alternating years of high abundance, they can initiate pelagic trophic cascades in the northern North Pacific Ocean and Bering Sea and depress the availability of common prey resources of other species of salmon, resident seabirds, and other pelagic species. We now propose that the geographic scale of ecosystem disservices of pink salmon is far greater due to a 15,000-kilometer transhemispheric teleconnection in a Pacific Ocean macrosystem maintained by short-tailed shearwaters (Ardenna tenuirostris), seabirds that migrate annually between their nesting grounds in the South Pacific Ocean and wintering grounds in the North Pacific Ocean. Over this century, the frequency and magnitude of mass mortalities of shearwaters as they arrive in Australia, and their abundance and productivity, have been related to the abundance of pink salmon. This has influenced human social, economic, and cultural traditions there, and has the potential t...Continue Reading

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Citations

Dec 24, 2018·Science·Juan C RochaSimon Levin
Aug 21, 2020·Nature Communications·K B OkeE P Palkovacs
Jul 18, 2019·Ecology·David García-CallejasDominique Gravel

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