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 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. Fiel...

Full description

Bibliographic Details
Published in:Marine Environmental Research
Main Authors: Brown, James, Whiteley, Nia, Bailey, Allison, Graham, Helen, Hop, Haakon, Rastrick, Samuel
Other Authors: University of Chester; Bangor University; Norwegian Polar Institute; Institute of Marine Research; Norwegian Polar Institute; Institute of Marine Research
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier 2020
Subjects:
Arctic
amphipods
cellular energy budgets
metabolic rates
ocean acidification
salinity
Kongsfjorden
Svalbard
Krossfjorden
Climate change
Kongsfjord*
Krossfjord*
Ocean acidification
Subarctic
Online Access:http://hdl.handle.net/10034/624052
https://chesterrep.openrepository.com/bitstream/handle/10034/624052/Svalbard%20GS_MER_Revised%20Version.pdf?sequence=3
https://doi.org/10.1016/j.marenvres.2020.105176
Description
Summary: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).

Similar Items