The evolving response of mesopelagic fishes to declining midwater oxygen concentrations in the southern and central California Current

TitleThe evolving response of mesopelagic fishes to declining midwater oxygen concentrations in the southern and central California Current
Publication TypeJournal Article
Year of Publication2019
AuthorsKoslow JA, Davison P., Ferrer E., Rosenberg S, Aceves-Medina G., Watson W
Volume76
Pagination626-638
Date Published2019/05
Type of ArticleArticle
ISBN Number1054-3139
Accession NumberWOS:000484403400003
Keywordsabundance; california current; current region; deoxygenation; depletion; dissolved-oxygen; Fisheries; ichthyoplankton; long-term changes; Marine & Freshwater Biology; mesopelagic fishes; north pacific; ocean; oceanography; Oxygen minimum zone; Pacific decadal oscillation; patterns; subsurface waters; variability
Abstract

Declining oxygen concentrations in the deep ocean, particularly in areas with pronounced oxygen minimum zones (OMZs), are a growing global concern related to global climate change. Its potential impacts on marine life remain poorly understood. A previous study suggested that the abundance of a diverse suite of mesopelagic fishes off southern California was closely linked to trends in midwater oxygen concentration. This study expands the spatial and temporal scale of that analysis to examine how mesopelagic fishes are responding to declining oxygen levels in the California Current (CC) off central, southern, and Baja California. Several warm-water mesopelagic species, apparently adapted to the shallower, more intense OMZ off Baja California, are shown to be increasing despite declining midwater oxygen concentrations and becoming increasingly dominant, initially off Baja California and subsequently in the CC region to the north. Their increased abundance is associated with warming near-surface ocean temperature, the warm phase of the Pacific Decadal oscillation and Multivariate El Nino-Southern Oscillation Index, and the increased flux of Pacific Equatorial Water into the southern CC.

DOI10.1093/icesjms/fsy154
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