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Acclimatization of the crustose coralline alga Porolithon onkodes to variable pCO₂.
PLoS One. 2014; 9(2):e87678.Plos

Abstract

Ocean acidification (OA) has important implications for the persistence of coral reef ecosystems, due to potentially negative effects on biomineralization. Many coral reefs are dynamic with respect to carbonate chemistry, and experience fluctuations in pCO₂ that exceed OA projections for the near future. To understand the influence of dynamic pCO₂ on an important reef calcifier, we tested the response of the crustose coralline alga Porolithon onkodes to oscillating pCO₂. Individuals were exposed to ambient (400 µatm), high (660 µatm), or variable pCO₂ (oscillating between 400/660 µatm) treatments for 14 days. To explore the potential for coralline acclimatization, we collected individuals from low and high pCO₂ variability sites (upstream and downstream respectively) on a back reef characterized by unidirectional water flow in Moorea, French Polynesia. We quantified the effects of treatment on algal calcification by measuring the change in buoyant weight, and on algal metabolism by conducting sealed incubations to measure rates of photosynthesis and respiration. Net photosynthesis was higher in the ambient treatment than the variable treatment, regardless of habitat origin, and there was no effect on respiration or gross photosynthesis. Exposure to high pCO₂ decreased P. onkodes calcification by >70%, regardless of the original habitat. In the variable treatment, corallines from the high variability habitat calcified 42% more than corallines from the low variability habitat. The significance of the original habitat for the coralline calcification response to variable, high pCO₂ indicates that individuals existing in dynamic pCO₂ habitats may be acclimatized to OA within the scope of in situ variability. These results highlight the importance of accounting for natural pCO₂ variability in OA manipulations, and provide insight into the potential for plasticity in habitat and species-specific responses to changing ocean chemistry.

Authors+Show Affiliations

Department of Biology, California State University, Northridge, California, United States of America.Department of Biology, California State University, Northridge, California, United States of America.Department of Biology, California State University, Northridge, California, United States of America.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

24505305

Citation

Johnson, Maggie D., et al. "Acclimatization of the Crustose Coralline Alga Porolithon Onkodes to Variable PCO₂." PloS One, vol. 9, no. 2, 2014, pp. e87678.
Johnson MD, Moriarty VW, Carpenter RC. Acclimatization of the crustose coralline alga Porolithon onkodes to variable pCO₂. PLoS ONE. 2014;9(2):e87678.
Johnson, M. D., Moriarty, V. W., & Carpenter, R. C. (2014). Acclimatization of the crustose coralline alga Porolithon onkodes to variable pCO₂. PloS One, 9(2), e87678. https://doi.org/10.1371/journal.pone.0087678
Johnson MD, Moriarty VW, Carpenter RC. Acclimatization of the Crustose Coralline Alga Porolithon Onkodes to Variable PCO₂. PLoS ONE. 2014;9(2):e87678. PubMed PMID: 24505305.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Acclimatization of the crustose coralline alga Porolithon onkodes to variable pCO₂. AU - Johnson,Maggie D, AU - Moriarty,Vincent W, AU - Carpenter,Robert C, Y1 - 2014/02/05/ PY - 2013/08/28/received PY - 2013/12/29/accepted PY - 2014/2/8/entrez PY - 2014/2/8/pubmed PY - 2014/11/9/medline SP - e87678 EP - e87678 JF - PloS one JO - PLoS ONE VL - 9 IS - 2 N2 - Ocean acidification (OA) has important implications for the persistence of coral reef ecosystems, due to potentially negative effects on biomineralization. Many coral reefs are dynamic with respect to carbonate chemistry, and experience fluctuations in pCO₂ that exceed OA projections for the near future. To understand the influence of dynamic pCO₂ on an important reef calcifier, we tested the response of the crustose coralline alga Porolithon onkodes to oscillating pCO₂. Individuals were exposed to ambient (400 µatm), high (660 µatm), or variable pCO₂ (oscillating between 400/660 µatm) treatments for 14 days. To explore the potential for coralline acclimatization, we collected individuals from low and high pCO₂ variability sites (upstream and downstream respectively) on a back reef characterized by unidirectional water flow in Moorea, French Polynesia. We quantified the effects of treatment on algal calcification by measuring the change in buoyant weight, and on algal metabolism by conducting sealed incubations to measure rates of photosynthesis and respiration. Net photosynthesis was higher in the ambient treatment than the variable treatment, regardless of habitat origin, and there was no effect on respiration or gross photosynthesis. Exposure to high pCO₂ decreased P. onkodes calcification by >70%, regardless of the original habitat. In the variable treatment, corallines from the high variability habitat calcified 42% more than corallines from the low variability habitat. The significance of the original habitat for the coralline calcification response to variable, high pCO₂ indicates that individuals existing in dynamic pCO₂ habitats may be acclimatized to OA within the scope of in situ variability. These results highlight the importance of accounting for natural pCO₂ variability in OA manipulations, and provide insight into the potential for plasticity in habitat and species-specific responses to changing ocean chemistry. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/24505305/Acclimatization_of_the_crustose_coralline_alga_Porolithon_onkodes_to_variable_pCO₂_ L2 - http://dx.plos.org/10.1371/journal.pone.0087678 DB - PRIME DP - Unbound Medicine ER -