Climate variability and sardine recruitment in the California Current: A mechanistic analysis of an ecosystem model

2018 ◽  
Vol 27 (6) ◽  
pp. 602-622 ◽  
Author(s):  
Dimitrios V. Politikos ◽  
Enrique N. Curchitser ◽  
Kenneth A. Rose ◽  
David M. Checkley ◽  
Jerome Fiechter
Keyword(s):  
Climate Variability ◽  
California Current ◽  
Ecosystem Model ◽  
Mechanistic Analysis

scholarly journals Ocean fronts drive marine fishery production and biogeochemical cycling

2015 ◽  
Vol 112 (6) ◽  
pp. 1710-1715 ◽  
Author(s):  
C. Brock Woodson ◽  
Steven Y. Litvin
Keyword(s):  
Habitat Degradation ◽  
California Current ◽  
Ecosystem Model ◽  
Nutrient Supply ◽  
Ocean Fronts ◽  
High Productivity ◽  
Marine Fishery ◽  
Trophic Pathways ◽  
Biogeochemical Hotspots

Long-term changes in nutrient supply and primary production reportedly foreshadow substantial declines in global marine fishery production. These declines combined with current overfishing, habitat degradation, and pollution paint a grim picture for the future of marine fisheries and ecosystems. However, current models forecasting such declines do not account for the effects of ocean fronts as biogeochemical hotspots. Here we apply a fundamental technique from fluid dynamics to an ecosystem model to show how fronts increase total ecosystem biomass, explain fishery production, cause regime shifts, and contribute significantly to global biogeochemical budgets by channeling nutrients through alternate trophic pathways. We then illustrate how ocean fronts affect fishery abundance and yield, using long-term records of anchovy–sardine regimes and salmon abundances in the California Current. These results elucidate the fundamental importance of biophysical coupling as a driver of bottom–up vs. top–down regulation and high productivity in marine ecosystems.

Risks of ocean acidification in the California Current food web and fisheries: ecosystem model projections

2017 ◽  
Vol 23 (4) ◽  
pp. 1525-1539 ◽  
Author(s):  
Kristin N. Marshall ◽  
Isaac C. Kaplan ◽  
Emma E. Hodgson ◽  
Albert Hermann ◽  
D. Shallin Busch ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Food Web ◽  
California Current ◽  
Ecosystem Model

Multidecadal Climate Variability in the Southern Region of the California Current System During the Last 1,800 Years

2020 ◽  
Vol 35 (2) ◽  
Author(s):  
Jose Abella‐Gutiérrez ◽  
Juan Carlos Herguera ◽  
P. Graham Mortyn ◽  
Christopher S. Kelly ◽  
Miguel A. Martínez‐Botí
Keyword(s):  
Climate Variability ◽  
Current System ◽  
California Current ◽  
Southern Region ◽  
California Current System ◽  
Multidecadal Climate Variability

A resonant response of the California Current circulation to forcing by low frequency climate variability

2018 ◽  
Vol 151 ◽  
pp. 16-36 ◽  
Author(s):  
William J. Crawford ◽  
Andrew M. Moore ◽  
Michael G. Jacox ◽  
Jérôme Fiechter ◽  
Emilie Neveu ◽  
...  
Keyword(s):  
Climate Variability ◽  
Low Frequency ◽  
California Current ◽  
Resonant Response ◽  
Current Circulation

scholarly journals Flexible use of a dynamic energy landscape buffers a marine predator against extreme climate variability

2021 ◽  
Vol 288 (1956) ◽  
pp. 20210671
Author(s):  
Gemma Carroll ◽  
Stephanie Brodie ◽  
Rebecca Whitlock ◽  
James Ganong ◽  
Steven J. Bograd ◽  
...  
Keyword(s):  
Climate Variability ◽  
Energy Intake ◽  
Prey Availability ◽  
Energy Landscape ◽  
California Current ◽  
Seasonal Migration ◽  
Thunnus Orientalis ◽  
Thermal Habitat ◽  
Marine Predator ◽  
Optimal Temperature Range

Animal migrations track predictable seasonal patterns of resource availability and suitable thermal habitat. As climate change alters this ‘energy landscape’, some migratory species may struggle to adapt. We examined how climate variability influences movements, thermal habitat selection and energy intake by juvenile Pacific bluefin tuna ( Thunnus orientalis ) during seasonal foraging migrations in the California Current. We tracked 242 tuna across 15 years (2002–2016) with high-resolution archival tags, estimating their daily energy intake via abdominal warming associated with digestion (the ‘heat increment of feeding’). The poleward extent of foraging migrations was flexible in response to climate variability, allowing tuna to track poleward displacements of thermal habitat where their standard metabolic rates were minimized. During a marine heatwave that saw temperature anomalies of up to +2.5°C in the California Current, spatially explicit energy intake by tuna was approximately 15% lower than average. However, by shifting their mean seasonal migration approximately 900 km poleward, tuna remained in waters within their optimal temperature range and increased their energy intake. Our findings illustrate how tradeoffs between physiology and prey availability structure migration in a highly mobile vertebrate, and suggest that flexible migration strategies can buffer animals against energetic costs associated with climate variability and change.

An emergent community ecosystem model applied to the California Current System

2010 ◽  
Vol 83 (3-4) ◽  
pp. 221-241 ◽  
Author(s):  
Nicole L. Goebel ◽  
Christopher A. Edwards ◽  
Jonathan P. Zehr ◽  
Michael J. Follows
Keyword(s):  
Current System ◽  
California Current ◽  
Ecosystem Model ◽  
California Current System ◽  
Emergent Community
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