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

Autor: Brown J; Department of Biological Sciences, University of Chester, Thomas Building, Parkgate Road, Chester, CH1 4BJ, UK. Electronic address: brown.j@chester.ac.uk., Whiteley NM; School of Natural Sciences, Bangor University, Deiniol Road, Bangor, Gwynedd. LL57 2UW, UK., Bailey AM; Norwegian Polar Institute, Fram Centre, 9296, Tromsø, Norway., Graham H; Institute of Marine Research, P.O. Box 1870, Nordnes, 5817, Bergen, Norway., Hop H; Norwegian Polar Institute, Fram Centre, 9296, Tromsø, Norway., Rastrick SPS; Institute of Marine Research, P.O. Box 1870, Nordnes, 5817, Bergen, Norway.
Jazyk: angličtina
Zdroj: Marine environmental research [Mar Environ Res] 2020 Dec; Vol. 162, pp. 105176. Date of Electronic Publication: 2020 Oct 07.
DOI: 10.1016/j.marenvres.2020.105176
Abstrakt: 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, MO 2 , and Cellular Energy Allocation, CEA). In the field, all populations had similar osmregulatory capacities and MO 2 , but lower-salinity populations had lower CEA. Reduced salinity (S = 23) and elevated pCO 2 (~1000 μatm) in the laboratory for one month increased gill NKA activities and reduced CEA in all populations, but increased MO 2 in the higher-salinity population. Elevated pCO 2 did not interact with salinity and had no effect on NKA activities or CEA, but reduced MO 2 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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Databáze: MEDLINE
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