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...
Published in: | Marine Environmental Research |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
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Subjects: | |
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 |
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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