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Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus

Brown, James
; 
Whiteley, Nia
; 
Bailey, Allison
; 
Graham, Helen
; 
Hop, Haakon
; 
Rastrick, Samuel
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University of Chester; Bangor University; Norwegian Polar Institute; Institute of Marine Research; Norwegian Polar Institute; Institute of Marine Research
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2020-10-07
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Biological Sciences
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Abstract
Climate change is leading to alterations in salinity and carbonate chemistry in arctic/sub-arctic marine ecosystems. We examined three nominal populations of the circumpolar arctic/subarctic amphipod, Gammarus setosus, along a salinity gradient in the Kongsfjorden-Krossfjorden area of Svalbard. Field and laboratory experiments assessed physiological (haemolymph osmolality and gill Na+/K+-ATPase activity, NKA) and energetic responses (metabolic rates, MO2, and Cellular Energy Allocation, CEA). In the field, all populations had similar osmregulatory capacities and MO2, but lower-salinity populations had lower CEA. Reduced salinity (S = 23) and elevated pCO2 (~1000 μatm) in the laboratory for one month increased gill NKA activities and reduced CEA in all populations, but increased MO2 in the higher-salinity population. Elevated pCO2 did not interact with salinity and had no effect on NKA activities or CEA, but reduced MO2 in all populations. Reduced CEA in lower-rather than higher-salinity populations may have longer term effects on other energy demanding processes (growth and reproduction).
Citation
Brown, J., Whiteley, N. M., Bailey, A. M., Graham, H., Hop, H., & Rastrick, S. P. (2020). Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus. Marine Environmental Research, 162, 105176. https://doi.org/10.1016/j.marenvres.2020.105176
Publisher
Elsevier
Journal
Marine Environmental Research
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http://hdl.handle.net/10034/624052
DOI
10.1016/j.marenvres.2020.105176
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Article
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0141-1136
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https://www.sciencedirect.com/science/article/pii/S0141113620305419?via%3Dihub