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dc.contributor.authorSchram, Julie B.
dc.contributor.authorSchoenrock, Kathryn M.
dc.contributor.authorMcClintock, James B.
dc.contributor.authorAmsler, Charles D.
dc.contributor.authorAngus, Robert A.
dc.date.accessioned2022-05-03T21:54:51Z
dc.date.available2022-05-03T21:54:51Z
dc.date.issued2016-07-08
dc.identifier.citationSchram, JB; Schoenrock, KM; McClintock, JB; Amsler, CD; Angus, RA (2016) Seawater acidification more than warming presents a challenge for two Antarctic macroalgal associated amphipods. Mar Ecol Prog Ser. 554, 81-97, DOI: 10.3354/meps11814.en_US
dc.identifier.urihttp://hdl.handle.net/11122/12874
dc.description.abstractElevated atmospheric pCO2 concentrations are triggering seawater pH reductions and seawater temperature increases along the western Antarctic Peninsula (WAP). These factors in combination have the potential to influence organisms in an antagonistic, additive, or synergistic manner. The amphipods Gondogeneia antarctica and Paradexamine fissicauda represent prominent members of macroalgal-associated mesograzer assemblages of the WAP. Our primary objective was to investigate amphipod behavioral and physiological responses to reduced seawater pH and elevated temperature to evaluate potential cascading ecological impacts. For 90 d, amphipods were exposed to combinations of seawater conditions based on present ambient (pH 8.0, 1.5°C) and predicted end-of-century conditions (pH 7.6, 3.5°C). We recorded survival, molt frequency, and macroalgal consumption rates as well as change in wet mass and proximate body composition (protein and lipid). Survival for both species declined significantly at reduced pH and co-varied with molt frequency. Consumption rates in G. antarctica were significantly higher at reduced pH and there was an additive pH−temperature effect on consumption rates in P. fissicauda. Body mass was reduced for G. antarctica at elevated temperature, but there was no significant effect of pH or temperature on body mass in P. fissicauda. Exposure to the pH or temperature levels tested did not induce significant changes in whole body biochemical composition of G. antarctica, but exposure to elevated temperature resulted in a significant increase in whole body protein content of P. fissicauda. Our study indicates that while elevated temperature causes sub-lethal impacts on both species of amphipods, reduced pH causes significant mortality.en_US
dc.description.sponsorshipThe authors gratefully acknowledge the outstanding science and logistical support staff of Antarctic Support Contract for their invaluable support. Margaret Amsler and Kevin Scriber of the Department of Biology provided valuable field assistance. We appreciate the invaluable statistics consultation provided by Charles Katholi. Thanks are due to Kenan Matterson for his assistance with the protein analyses and Robert Thacker for use of his laboratory equipment. The present study was directly supported by NSF award ANT-1041022 (J.B.M., C.D.A., R.A.A.) from the Antarctic Organisms and Ecosystems program. J.B.M. also acknowledges partial support from NSF Award ANT-1141896, a collaborative grant award with R. B. Aronson (ANT-1141877). The UAB Department of Biology and an Endowed Professorship in Polar and Marine Biology provided additional support to J.B.M.en_US
dc.language.isoen_USen_US
dc.publisherInter-Researchen_US
dc.subjectWestern Antarctic Peninsulaen_US
dc.subjectCrustaceanen_US
dc.subjectSurvivalen_US
dc.subjectGrowthen_US
dc.subjectMolt frequencyen_US
dc.subjectConsumption Ratesen_US
dc.subjectClimate changeen_US
dc.titleSeawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipodsen_US
dc.typeArticleen_US
dc.description.peerreviewYesen_US
refterms.dateFOA2022-05-03T21:54:51Z
dc.identifier.journalMarine Ecology Progress Seriesen_US


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