The pelagic ecosystem in the Northern California Current off Oregon during the 2014-2016 warm anomalies within the context of the past 20 years

Journal of Geophysical Research. Oceans
William T PetersonC Tracy Shaw

Abstract

A warm anomaly in the upper ocean, colloquially named "the Blob," appeared in the Gulf of Alaska during the calm winter of 2013-2014, spread across the northern North Pacific (NP) Ocean, and shifted eastward and onto the Oregon shelf. At least 14 species of copepods occurred which had never been observed in shelf/slope waters off Oregon, some of which are known to have NP Gyre affinities, indicating that the source waters of the coastal "Blob" were likely of both offshore (from the west) and subtropical/tropical origin. The anomalously warm conditions were reduced during strong upwelling in spring 2015 but returned when upwelling weakened in July 2015 and transitioned to downwelling in fall 2015. The extended period of warm conditions resulted in prolonged effects on the ecosystem off central Oregon, lasting at least through 2016. Impacts to the lower trophic levels were unprecedented and include a novel plankton community composition resulting from increased copepod, diatom, and dinoflagellate species richness and increased abundance of dinoflagellates. Additionally, the multiyear warm anomalies were associated with reduced biomass of copepods and euphausiids, high abundance of larvaceans and doliolids (indictors of oligotroph...Continue Reading

References

Jul 30, 2015·Global Change Biology·Jennifer L FisherRyan R Rykaczewski
Dec 6, 2016·Geophysical Research Letters·Ryan M McCabeVera L Trainer
Jan 11, 2017·Proceedings of the National Academy of Sciences of the United States of America·S Morgaine McKibbenAngelicque E White

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Citations

Feb 11, 2021·Scientific Reports·Kisei R TanakaSalvador J Jorgensen
Mar 31, 2021·Communications Biology·Petra H LenzDaniel K Hartline
Feb 13, 2021·Global Change Biology·Mayumi L ArimitsuVanessa R von Biela

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