Impacts of Ocean Acidification and Warming on the Growth and Development of Oregon Pink Shrimp (Pandalus jordani) Larvae

• Main Author: Nguyen, Michelle B.
• Other Authors: Waldbusser, George G., Ciannelli, Lorenzo, Bernard, Kim S., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University. Sea Grant College Program
• Format: Master Thesis
• Language: English; unknown
• Published: Oregon State University
• Subjects: Ocean acidification
• Online Access: https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qn59qb41q

Anthropogenic carbon dioxide emissions are causing ocean acidification (OA) and ocean warming, which have negative effects on the larvae of many marine invertebrates. Oregon pink shrimp (Pandalus jordani) currently encounter upwelling events that can result in pH values as low as 7.6, and, more recently, marine heat waves that raise sea surface temperatures by 2-4 °C. As climate change intensifies OA and warming, pink shrimp larvae will experience more frequent and intense exposure to potentially adverse conditions. We conducted laboratory experiments in 2018 and 2019 to determine the effects of acidification and a combination of acidification and warming on larval P. jordani, respectively. In 2018, P. jordani larvae were exposed to pHNBS 7.7, 7.8, 7.9, and 8.0 at 11°C. In 2019, we utilized a fully factorial experiment with four pH levels (pH 7.6, 7.8, 8.0, 8.2) and three temperatures (8°, 11°, 14 °C). Larval growth rates from 2018 decreased 16% from the highest to lowest pH treatments. In 2019, there was no significant effect of pH, temperature, or the interaction of OA and warming on growth rate. Connectivity issues and difficulties with calibration of the feedback controller in 2019 led to high fluctuation of the pH treatments away from their intended targets. Despite this, there was 100% mortality in the 14 °C treatment, suggesting a greater impact of temperature than pH, especially within the upper range of pink shrimp thermal tolerance. Respiration rate increased significantly with temperature, however larvae reared in the highest temperature treatment exhibited low growth rates, indicating increased temperature resulted in a shift in energy consumption toward maintenance costs. Our findings demonstrate the potential effects of OA and warming on larval growth and a pronounced negative impact of warming on larval survivorship. Under projected intensification of upwelling and increased prevalence of marine heat waves in the California Current System, P. jordani larvae may experience an increase in ...