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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 et al.
In: Marine Environmental Research, Vol. 162, 105176, 01.12.2020.

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Brown, J., Whiteley, N., Bailey, A., Graham, H., Hop, H., & Rastrick, S. (2020). Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus. Marine Environmental Research, 162, Article 105176. https://doi.org/10.1016/j.marenvres.2020.105176

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Brown J, Whiteley N, Bailey A, Graham H, Hop H, Rastrick S. Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus. Marine Environmental Research. 2020 Dec 1;162:105176. Epub 2020 Oct 7. doi: 10.1016/j.marenvres.2020.105176

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Brown, James ; Whiteley, Nia ; Bailey, Allison et al. / Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus. In: Marine Environmental Research. 2020 ; Vol. 162.

RIS

TY - JOUR

T1 - Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus

AU - Brown, James

AU - Whiteley, Nia

AU - Bailey, Allison

AU - Graham, Helen

AU - Hop, Haakon

AU - Rastrick, Samuel

PY - 2020/12/1

Y1 - 2020/12/1

N2 - 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).

AB - 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).

KW - Arctic

KW - Amphipod

KW - cellular energy budgets

KW - metabolic rates

KW - ocean acidification

KW - salinity

KW - Kongsfjorden

KW - Svalbard

U2 - 10.1016/j.marenvres.2020.105176

DO - 10.1016/j.marenvres.2020.105176

M3 - Article

VL - 162

JO - Marine Environmental Research

JF - Marine Environmental Research

SN - 0141-1136

M1 - 105176

ER -