Contrasting responses to salinity and future ocean acidification in arctic populations of the amphipod Gammarus setosus
| Autor: | N.M. Whiteley, Samuel P. S. Rastrick, James Brown, Allison Bailey, Haakon Hop, Helen Graham |
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| Rok vydání: | 2020 |
| Předmět: |
Gills
Salinity media_common.quotation_subject Population Zoology Aquatic Science Biology Oceanography Gammarus setosus Svalbard Animals Marine ecosystem Amphipoda Seawater education Ecosystem media_common education.field_of_study Arctic Regions Ocean acidification General Medicine Hydrogen-Ion Concentration biology.organism_classification Pollution Subarctic climate Arctic Reproduction |
| Zdroj: | Marine environmental research. 162 |
| ISSN: | 1879-0291 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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