Decalcification and survival of benthic foraminifera under the combined impacts of varying pH and salinity

Charrieau, Laurie M.Lund University,Lunds universitet,Miljövetenskap,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Environmental Science,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology (author)

Coastal areas display natural large environmental variability such as frequent changes in salinity, pH, and carbonate chemistry. Anthropogenic impacts – especially ocean acidification – increase this variability, which may affect the living conditions of coastal species, particularly, calcifiers. We performed culture experiments on living benthic foraminifera to study the combined effects of lowered pH and salinity on the calcification abilities and survival of the coastal, calcitic species Ammonia sp. and Elphidium crispum. We found that in open ocean conditions (salinity ∼35) and lower pH than usual values for these species, the specimens displayed resistance to shell (test) dissolution for a longer time than in brackish conditions (salinity ∼5 to 20). However, the response was species specific as Ammonia sp. specimens survived longer than E. crispum specimens when placed in the same conditions of salinity and pH. Living, decalcified juveniles of Ammonia sp. were observed and we show that desalination is one cause for the decalcification. Finally, we highlight the ability of foraminifera to survive under Ωcalc < 1, and that high salinity and [Ca2+] as building blocks are crucial for the foraminiferal calcification process.

Filipsson, Helena L.Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science(Swepub:lu)geol-h_f (author)
Nagai, YukikoYokohama National University,Japan Agency for Marine-Earth Science and Technology (author)
Kawada, SachikoJapan Agency for Marine-Earth Science and Technology (author)
Ljung, KarlLund University,Lunds universitet,Miljövetenskap,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Environmental Science,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology(Swepub:lu)geol-klj (author)
Kritzberg, EmmaLund University,Lunds universitet,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Division aquatic ecology,Department of Biology,Faculty of Science(Swepub:lu)lim-ekr (author)
Toyofuku, TakashiJapan Agency for Marine-Earth Science and Technology,Tokyo University of Marine Science and Technology (author)
MiljövetenskapCentrum för miljö- och klimatvetenskap (CEC) (creator_code:org_t)

By the author/editor: Charrieau, Lauri ...; Filipsson, Helen ...; Nagai, Yukiko; Kawada, Sachiko; Ljung, Karl; Kritzberg, Emma; show more...; Toyofuku, Takash ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

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