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Marine Ecology Progress Series

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MEPS 646:69-78 (2020)  -  DOI:

Predator populations differ in their foraging responses to acute seawater acidification

Gina M. Contolini*, Kristy J. Kroeker, Eric P. Palkovacs

Department of Ecology and Evolutionary Biology, University of California Santa Cruz, 130 McAllister Way, Santa Cruz, CA 95060, USA
*Corresponding author:

ABSTRACT: Local adaptation can cause predator populations to vary in traits and their effects on prey, but few studies have tested whether divergent predator populations respond differently to acute environmental stressors. We tested how Nucella dogwhelks from 3 populations with natural exposure to distinct environmental regimes in the California Current System altered consumption of mussel prey (Mytilus californianus) in ambient (pH 8.0, 429 µatm partial pressure of CO2 [pCO2]) and acidified (pH 7.6, 1032 µatm pCO2) seawater. Overall, experimental acidification increased the variation in consumption time observed among populations. We found reduced consumption time for the population that experienced more frequent exposure to low pH conditions in nature but not for populations with less prior exposure. Exposure to acidification also altered the individual components of consumption time—search time and handling time—depending on source population. These results indicate that impaired predator performance is not a universal response to acidification, that predation responses to acute acidification can be population specific, and that individual population responses may relate to prior exposure. Our study highlights how population-specific responses to climate change can lead to differences in ecological effects that may restructure prey communities at local scales.

KEY WORDS: Intraspecific trait variation · Predator-prey interaction · Ocean acidification · Climate change · Contemporary evolution · Rocky intertidal

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Cite this article as: Contolini GM, Kroeker KJ, Palkovacs EP (2020) Predator populations differ in their foraging responses to acute seawater acidification. Mar Ecol Prog Ser 646:69-78.

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