Helicosphaera carteri (Prymnesiophyceae) under high carbon dioxide : An experimental study
Bianco, Stefania (University of Pavia)
Bordiga, Manuela (National Institute of Oceanography and Applied Geophysics)
Langer, Gerald (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Ziveri, Patrizia (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Cerino, Federica (National Institute of Oceanography and Applied Geophysics)
Relitti, Federica (National Institute of Oceanography and Applied Geophysics)
Laudicella, Vincenzo Alessandro (National Institute of Oceanography and Applied Geophysics)
Di Giulio, Andrea (University of Pavia)
Lupi, Claudia (University of Pavia)

Date:	2025
Abstract:	The coccolithophore Helicosphaera carteri is an understudied, yet ecologically and biogeochemically important, marine calcifier. Hence, its response to ocean acidification has implications for ecosystem function and the marine carbon cycle. Here we employed dilute batch cultures featuring a coupled C-system manipulation (295, 444, and 600 μatm CO2) to analyze the response of H. carteri in terms of growth rate and particulate carbon production, two key eco-physiological and biogeochemical parameters. We highlight that both growth rate and organic carbon production are CO2 limited at 295 µatm but are not proton inhibited at 600 µatm of CO2. This finding, combined with the maintenance of a stable inorganic production rate, places H. carteri among the coccolithophores less sensitive to seawater acidification. In addition, we tested a widely applied assumption underpinning the determination of carbon production, namely the constancy of particulate carbon quotas over the course of a dilute batch culture. We determined that the assumption holds true, an important validation of a method used in many publications.
Grants:	Generalitat de Catalunya 2021/SGR-0064 Ministerio de Ciencia e Innovación CEX2019-000940-M
Note:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Coccolithophores ; Helicosphaera carteri ; Ocean acidification
Published in:	Journal of Phycology, November 2025, ISSN 1529-8817

DOI: 10.1111/jpy.70103
PMID: 41283763

15 p, 2.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut de Ciència i Tecnologia Ambientals (ICTA)
Articles > Research articles
Articles > Published articles