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

Climate change is leading to alterations in salinity and carbonate chemistry in arctic/sub-arctic marine eco- systems. We examined three nominal populations of the circumpolar arctic/subarctic amphipod, Gammarus setosus, along a salinity gradient in the Kongsfjorden-Krossfjorden area of Svalbard. Fi...

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Bibliographic Details
Published in:Marine Environmental Research
Main Authors: Brown, James, Whiteley, Nia, Bailey, Allison, Graham, Helen, Hop, Haakon, Rastrick, Samuel
Format: Article in Journal/Newspaper
Language:English
Published: 2020
Subjects:
Arctic
Amphipod
cellular energy budgets
metabolic rates
ocean acidification
salinity
Kongsfjorden
Svalbard
/dk/atira/pure/subjectarea/asjc/1100
Agricultural and Biological Sciences(all)
Krossfjorden
Arctic amphipod
Climate change
Kongsfjord*
Krossfjord*
Ocean acidification
Subarctic
Online Access:https://research.bangor.ac.uk/portal/en/researchoutputs/contrasting-responses-to-salinity-and-future-ocean-acidification-in-arctic-populations-of-the-amphipod-gammarus-setosus(31dc00e9-cbd5-49f1-b7de-ab909bc5f605).html
https://doi.org/10.1016/j.marenvres.2020.105176
https://research.bangor.ac.uk/ws/files/36141425/Svalbard_GS_MER_Revised_Version_1_.pdf
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Summary:Climate change is leading to alterations in salinity and carbonate chemistry in arctic/sub-arctic marine eco- systems. 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 ex- periments 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).

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