Abstract
Anthropogenic atmospheric CO2 concentrations are increasing rapidly, resulting in declining seawater pH (ocean acidification). The majority of ocean acidification research to date has focused on the effects of decreased pH in single-species experiments. To assess how decreased pH may influence natural macroalgal-grazer assemblages, we conducted a mesocosm experiment with the common, chemically defended Antarctic brown macroalga Desmarestia menziesii and natural densities of its associated grazer assemblage, predominantly amphipods. Grazer assemblages were collected from the immediate vicinity of Palmer Station (64°46′S, 64°03′W) in March 2013. Assemblages were exposed for 30 days to three levels of pH representing present-day mean summer ambient conditions (pH 8.0), predicted near-future conditions (2100, pH 7.7), and distant-future conditions (pH 7.3). A significant difference was observed in the composition of mesograzer assemblages in the lowest pH treatment (pH 7.3). The differences between assemblages exposed to pH 7.3 and those maintained in the other two treatments were driven primarily by decreases in the abundance of the amphipod Metaleptamphopus pectinatus with decreasing pH, reduced copepod abundance at pH 7.7, and elevated ostracod abundance at pH 7.7. Generally, the assemblages maintained at pH 7.7 were not significantly different from those at ambient pH, demonstrating resistance to short-term decreased pH. The relatively high prevalence of generalist amphipods may have contributed to a net stabilizing effect on the assemblages exposed to decreased pH. Overall, our results suggest that crustacean grazer assemblages associated with D. menziesii, the dominant brown macroalgal species of the western Antarctic Peninsula, may be resistant to short-term near-future decreases in seawater pH.
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Acknowledgments
The authors gratefully acknowledge the outstanding science and logistical support staff of Antarctic Support Contract (ASC) for their invaluable help and support of the United States Antarctic Program (USAP). Kevin Scriber of the Department of Biology provided valuable field assistance. We also would like to acknowledge the constructive comments provided by two anonymous reviewers that helped improve this manuscript. The present study was supported by NSF award ANT-1041022 (JBM, CDA, RAA) from the Antarctic Organisms and Ecosystems program. The UAB Department of Biology and an Endowed Professorship in Polar and Marine Biology provided additional support to JBM.
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Schram, J.B., Amsler, M.O., Amsler, C.D. et al. Antarctic crustacean grazer assemblages exhibit resistance following exposure to decreased pH. Mar Biol 163, 106 (2016). https://doi.org/10.1007/s00227-016-2894-y
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DOI: https://doi.org/10.1007/s00227-016-2894-y