Population Ecology

, Volume 58, Issue 4, pp 515–524 | Cite as

Translating crustacean biological responses from CO2 bubbling experiments into population-level predictions

  • Jason S. Grear
Original article


Many studies of animal responses to ocean acidification focus on uniformly conditioned age cohorts that lack complexities typically found in wild populations. These studies have become the primary data source for predicting higher level ecological effects, but the roles of intraspecific interactions in re-shaping biological, demographic and evolutionary responses are not commonly considered. To explore this problem, I assessed responses in the mysid Americamysis bahia to bubbling of CO2-enriched and un-enriched air into the seawater supply in flow-through aquariums. I conducted one experiment using isolated age cohorts and a separate experiment using intact populations. The seawater supply was continuously input from Narragansett Bay (Rhode Island, USA). The 28-day cohort study was maintained without resource or spatial limitations, whereas the 5-month population study consisted of stage-structured populations that were allowed to self-regulate. These differences are common features of experiments and were intentionally retained to demonstrate the effect of methodological approaches on perceptions of effect mechanisms. The CO2 treatment reduced neonate abundance in the cohort experiment (24% reduction due to a mean pH difference of −0.27) but not in the population experiment, where effects were small and were strongest for adult and stage 1 survival (3% change due to a mean pH difference of −0.25). I also found evidence of competition in the population experiment, further complicating relationships with cohort experiments. These results point to limitations of standard cohort tests. Such experiments should be complimented by studies of intact populations where responses may be affected by evolution, acclimation, and competition.


Carbon dioxide Cohort Demography Ocean acidification pH 



I am grateful to Ruth Gutjahr-Gobell and Doranne Borsay Horowitz for their assistance during the mysid experiments. Harriet Booth, Adam Pimenta and Brenda Rashleigh provided helpful comments on an earlier version of this manuscript. This manuscript was submitted with tracking number ORD-010744 by the Atlantic Ecology Division, National Health and Environmental Effects Research Laboratory, Office of Research and Development, US Environmental Protection Agency (EPA). Although the research described in this article was funded by EPA, it has not been subjected to agency review and does not necessarily reflect the views of the agency.


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Copyright information

© The Society of Population Ecology and Springer Japan (outside the USA) 2016

Authors and Affiliations

  1. 1.Atlantic Ecology DivisionNational Health and Environmental Effects Research Laboratory, US EPA Office of Research and DevelopmentNarragansettUSA

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