Presentation Abstract

The synergy of ocean acidification and ocean warming may lead to negative marine organism responses not apparent under single stressors. While adult fish are effective acid-base regulators, and presumably less affected by environmental stressors, early life stages may be more susceptible. Pacific herring are ecologically and economically important forage fish, native to the U.S. Pacific Northwest (PNW). However, the herring populations in the PNW have experienced reductions in stock abundance. This study focused on the combined effects of ocean acidification and ocean warming on Pacific herring embryo and larval life stages. Pacific herring embryos were incubated under a factorial design of two temperature (10°C, 16°C) and two pCO2 (600 µatm, 1600 µatm) treatments until hatch. The combination of high pCO2 and high temperature revealed greater embryo respiration aberrations. Embryos reared under the high temperature treatment, for both pCO2 levels, experienced greater occurrences of larval mortality and abnormalities. These data indicate that while temperature may be a primary global change stressor affecting Pacific herring embryology and future herring populations, interactive effects with pCO2 may introduce additional challenges.

Session Title

Advances in the Understanding of Drivers of Change and Potential Conservation Actions for Pacific Herring in the Salish Sea

Keywords

Ocean acidification, Interactive effects

Conference Track

SSE11: Species and Food Webs

Conference Name

Salish Sea Ecosystem Conference (Seattle, WA : 2018)

Document Type

Event

SSEC Identifier

SSE11-170

Start Date

6-4-2018 1:45 PM

End Date

6-4-2018 2:00 PM

Type of Presentation

Oral

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Geographic Coverage

Salish Sea (B.C. and Wash.)

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

text

Language

English

Format

application/pdf

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Apr 6th, 1:45 PM Apr 6th, 2:00 PM

Interactive effects of ocean acidification and ocean warming on Pacific herring (Clupea pallasi) early life stages

The synergy of ocean acidification and ocean warming may lead to negative marine organism responses not apparent under single stressors. While adult fish are effective acid-base regulators, and presumably less affected by environmental stressors, early life stages may be more susceptible. Pacific herring are ecologically and economically important forage fish, native to the U.S. Pacific Northwest (PNW). However, the herring populations in the PNW have experienced reductions in stock abundance. This study focused on the combined effects of ocean acidification and ocean warming on Pacific herring embryo and larval life stages. Pacific herring embryos were incubated under a factorial design of two temperature (10°C, 16°C) and two pCO2 (600 µatm, 1600 µatm) treatments until hatch. The combination of high pCO2 and high temperature revealed greater embryo respiration aberrations. Embryos reared under the high temperature treatment, for both pCO2 levels, experienced greater occurrences of larval mortality and abnormalities. These data indicate that while temperature may be a primary global change stressor affecting Pacific herring embryology and future herring populations, interactive effects with pCO2 may introduce additional challenges.