Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods
Elevated 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 Gon...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/12874 2023-05-15T14:02:28+02:00 Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. 2016-07-08 http://hdl.handle.net/11122/12874 en_US eng Inter-Research Schram, 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. http://hdl.handle.net/11122/12874 Marine Ecology Progress Series Western Antarctic Peninsula Crustacean Survival Growth Molt frequency Consumption Rates Climate change Article 2016 ftunivalaska https://doi.org/10.3354/meps11814 2023-02-23T21:38:01Z Elevated 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. The 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 ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica University of Alaska: ScholarWorks@UA Antarctic Antarctic Peninsula Marine Ecology Progress Series 554 81 97 |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Western Antarctic Peninsula Crustacean Survival Growth Molt frequency Consumption Rates Climate change |
spellingShingle |
Western Antarctic Peninsula Crustacean Survival Growth Molt frequency Consumption Rates Climate change Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
topic_facet |
Western Antarctic Peninsula Crustacean Survival Growth Molt frequency Consumption Rates Climate change |
description |
Elevated 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. The 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 ... |
format |
Article in Journal/Newspaper |
author |
Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. |
author_facet |
Schram, Julie B. Schoenrock, Kathryn M. McClintock, James B. Amsler, Charles D. Angus, Robert A. |
author_sort |
Schram, Julie B. |
title |
Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
title_short |
Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
title_full |
Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
title_fullStr |
Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
title_full_unstemmed |
Seawater acidification more than warming presents a challenge for two Antarctic macroalgal-associated amphipods |
title_sort |
seawater acidification more than warming presents a challenge for two antarctic macroalgal-associated amphipods |
publisher |
Inter-Research |
publishDate |
2016 |
url |
http://hdl.handle.net/11122/12874 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica |
op_relation |
Schram, 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. http://hdl.handle.net/11122/12874 Marine Ecology Progress Series |
op_doi |
https://doi.org/10.3354/meps11814 |
container_title |
Marine Ecology Progress Series |
container_volume |
554 |
container_start_page |
81 |
op_container_end_page |
97 |
_version_ |
1766272741916278784 |