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Helena Filipsson, foto Erik Thor

Helena Filipsson

Professor

Helena Filipsson, foto Erik Thor

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

Författare

  • Laurie M. Charrieau
  • Helena L. Filipsson
  • Yukiko Nagai
  • Sachiko Kawada
  • Karl Ljung
  • Emma Kritzberg
  • Takashi Toyofuku

Summary, in English

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.

Avdelning/ar

  • Kvartärgeologi
  • Miljövetenskap
  • Enhet akvatisk ekologi
  • Akvatisk ekologi

Publiceringsår

2018-04-03

Språk

Engelska

Sidor

36-45

Publikation/Tidskrift/Serie

Marine Environmental Research

Volym

138

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Ecology
  • Environmental Sciences

Nyckelord

  • Benthic foraminifera
  • Calcification process
  • Coastal ocean acidification
  • Culture experiment
  • Desalination
  • Multiple stressors

Status

Published

Projekt

  • Drivers and Impacts of Coastal Ocean Acidification

Forskningsgrupp

  • Aquatic Ecology

ISBN/ISSN/Övrigt

  • ISSN: 0141-1136