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Changing environmental conditions are leading to shifts in the timing of seasonal events globally. In the ocean, environmental cues affecting larval fish (ichthyoplankton) abundance may not be synchronized with factors optimizing larval and juvenile survival, making the study of ichthyoplankton phenology in the context of a changing environment critical. In the southern California Current Ecosystem (CCE), a major eastern boundary current upwelling system, significant long‐term shifts in larval fish phenology have been previously observed. To assess the stability of these estimates and extend them to the northern CCE, we evaluated multidecadal trends in ichthyoplankton abundance for 57 species from the California Cooperative Oceanic Fisheries Investigations (CalCOFI) and 25 species from the Newport Hydrographic Line (NH Line). We show that on average, larval fish phenology in the southern CCE has continued to advance with an estimated rate of −0.18 ± 0.05 day year−1from 1951 to 2022, while phenology in the northern CCE has advanced at a rate of −0.48 ± 0.26 day year−1from 1996 to 2023. Thirty‐nine percent of species showed significant advancing phenology, 12% exhibited delayed phenology, and 49% showed no long‐term linear change. A comparison analysis showed that species in these groups had similar rates of change between the two locations for the 1997–2017 period. Phenological shifts in the southern CCE tracked changes in the phenology of upper ocean temperature, zooplankton, and upwelling. These variables poorly explained shifts in the northern CCE, where short‐term effects of the El Niño–Southern Oscillation and the 2014–2016 marine heatwave on ichthyoplankton phenology were observed for some species. This research highlights regional variability and continuing phenological shifts in one of the world's most productive marine ecosystems.
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This content will become publicly available on March 26, 2027
Physical oceanographic mechanisms associated with recent ecological responses in the California Current Ecosystem
Abstract The California Current System (CCS) is an upwelling eastern boundary ocean current that supports a productive ecosystem through a multitude of physical processes. The fundamental aspects of the ocean circulation are highlighted here and connected to their roles in driving and modulating various components of the California Current Ecosystem (CCE) in the context of pulse and press disturbances. Recent short-term climate events (pulses), such as marine heat waves, that generated highly anomalous responses in the ecology are identified and explained in terms of physical process drivers. The long-term vulnerability of the ecosystem to long-term climate changes (presses) is also discussed. The need for ecologists to collaborate with physical scientists to unravel the press versus pulse impacts on the CCE through sustained physical–ecological observations and high-resolution modeling is emphasized.
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- Award ID(s):
- 2224726
- PAR ID:
- 10681721
- Publisher / Repository:
- Oxford
- Date Published:
- Journal Name:
- BioScience
- ISSN:
- 0006-3568
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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