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Data from Schram et al. 2017 MEPS Data DOI: https://doi.org/10.15784/601062 Cite as Schram, J., & Amsler, C. (2017) "Data from Schram et al. 2017 MEPS" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601062. AMD - DIF Record(s) NSF-ANT10-41022_1 Abstract Increased anthropogenic atmospheric CO2 concentrations have resulted in ocean warming and alterations in ocean carbonate chemistry, decreasing seawater pH (ocean acidification). The combination of ocean warming and acidification (OWA) may alter trophic interactions in marine benthic communities along the western Antarctic Peninsula (WAP). Abundant and diverse macroalgae grazer assemblages, dominated by macroalgae (e.g. chemically defended Desmarestia anceps and D. menziesii) and gammarid amphipods (e.g. Gondogeneia antarctica), occur on the nearshore benthos along the WAP. In the present study, the amphipod G. antarctica and macroalgae D. anceps and D. menziesii were exposed for 39 and 79 d, respectively, to combinations of current and predicted near-future temperature (1.5 and 3.5ºC, respectively) and pH (8.0 and 7.6, respectively). Protein and lipid levels of macroalgal tissues were quantified, and 5-way choice amphipod feeding assays were performed with lyophilized macroalgal tissues collected at time zero and following exposure to the 4 temperature-pH treatments. For D. anceps, we found a significant interactive temperature-pH effect on lipid levels and significantly lower protein levels at reduced pH. In contrast, tissues of D. menziesii exhibited significantly greater lipid levels after exposure to reduced pH, but there was no temperature effect on lipid or protein levels. Despite shifts in macroalgal biochemical composition, there were no changes in amphipod feeding preferences. Our results indicate that despite altered macroalgal nutritional quality under OWA, both macroalgae retained their ability to deter amphipod feeding. This deterrent capacity could become an important contributor to net community resistance of macroalgae-mesograzer assemblages of the WAP to predicted OWA. Creator(s): Schram, Julie Date Created: 2017-10-20 Repository: USAP-DC (current) License: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0] Spatial Extent(s) West: -64.5, East: -64, South: -64.9, North: -64.5 Temporal Extent(s) Start: 2011-06-01 - End: 2016-05-31 Award(s) NSF 1041022 Version: 1 Related Project(s) The effects of ocean acidification and rising sea surface temperatures on shallow-water benthic organisms in Antarctica References Schram, J.B., K.M. Schoenrock, J.B. McClintock, C.D. Amsler, & R.A. Angus. 2017. Ocean warming and acidification alter Antarctic macroalgal biochemical composition but not amphipod grazer feeding preferences. Marine Ecology Progress Series 581: 45-56. (doi:10.3354/meps12308) Keywords Antarctic Peninsula Antarctica Biota Biota Chemistry:fluid Sample/collection Description Southern Ocean