Department or Program
Environmental Studies
Abstract
Climate anomalies in the California Current Ecosystem have direct and indirect impacts on marine resources and fisheries. Located along the West Coast of the United States, the ecosystem regularly experiences large-scale climate anomalies lasting from months to years (e.g., El Niño Southern Oscillation (ENSO) and large marine heatwaves) and state changes, namely shifts from relatively warm to relatively cool regimes described by the Pacific Decadal Oscillation (PDO). Fish are vulnerable to both climate variability and climate change because their underlying metabolic processes, such as food assimilation and respiration, are impacted by temperature. Yelloweye rockfish, Sebastes ruberrimus, are one of the largest and longest-lived rockfishes in the California Current Ecosystem. The reproductive strategy, growth strategy, and high site fidelity of yelloweye rockfish make them especially vulnerable to climate change, giving them a high conservation value. We hypothesized that yelloweye rockfish growth and reproduction would respond differently to anomalous climate events. Using a fish bioenergetics model, we assessed responses such as fish mass, maturity, and larval output between anomalous conditions for a range of life stages. Model results show that yelloweye mass, maturity, and larval output are more sensitive to events when the PDO and ENSO are co-occurring and cause more extreme deviations from average temperatures. Additionally, mass, maturity, and larval output showed a greater response to temperature at shallower depths and consumption at deeper depths. Understanding the impact anomalous events have on yelloweye rockfish bioenergetics is crucial for understanding the future implications of climate change on this already vulnerable species. Future research that identifies species-specific bioenergetic parameters would help improve the predictive ability of the model in order to inform management decisions.
Level of Access
Restricted: Embargoed [Bates Community After Expiration]
First Advisor
Holly Ewing
Date of Graduation
5-2021
Degree Name
Bachelor of Arts
Recommended Citation
Miller, Sophia, "Effects of Climate Variability on Yelloweye Rockfish (Sebastes ruberrimus) Bioenergetics in the California Current Ecosystem" (2021). Standard Theses. 247.
https://scarab.bates.edu/envr_studies_theses/247
Number of Pages
120
Components of Thesis
1 pdf file