Emiliania huxleyi coccolith calcite mass modulation by morphological changes and ecology in the Mediterranean Sea
D'Amario, Barbara (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Ziveri, Patrizia (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Grelaud, Michael (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Oviedo Sabogal, Ángela María (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)

Data:	2018
Resum:	To understand the response of marine calcifying organisms under high CO2 scenarios, it is critical to study their calcification patterns in the natural environment. This paper focuses on a major calcifying phytoplankton group, the coccolithophores, through the analysis of water samples collected along a W-E Mediterranean transect during two research cruises, in April 2011 (Meteor cruise M84/3) and May 2013 (MedSeA cruise 2013). The Mediterranean Sea is a marginal sea characterized by large biogeochemical gradients. Currently, it is undergoing both warming and ocean acidification, processes which are rapidly modifying species distribution and calcification. The species Emiliania huxleyi largely dominates the total coccolithophore production in present day oceans and marine basins, including the Mediterranean Sea. A series of morphometric measurements were performed on the coccoliths of this species to estimate their mass, length and calculate a calcification index (proxy for the size-normalized calcification degree). The most abundant morphotype of E. huxleyi in the Mediterranean Sea is Type A. Coccoliths of this morphotype were additionally analyzed based on scanning electron microscopy images: four calcification varieties were quantified, according to the relationship between slit length-tube width, and the state of the central area.
Resum:	(open or closed). The average E. huxleyi coccolith mass along the Mediterranean oceanographic transect depended strongly on both the average coccolith length and calcification index. The variability in average coccolith length and calcification index across samples reflected oscillations in the relative abundance of the calcification varieties. We also demonstrated that the distribution of the calcification varieties followed the main environmental gradients (carbonate chemistry, salinity, temperature, nutrient concentrations). Hence, shifts in the distribution of the calcification varieties and of the average E. huxleyi coccolith mass are to be expected in the Mediterranean Sea under climate change. These physiological and ecological responses will modulate the net coccolithophore calcification and, ultimately, the regional carbonate export to the seafloor.
Ajuts:	European Commission 265103 Ministerio de Economía y Competitividad CTM2016-79547-R Ministerio de Economía y Competitividad MDM-2015-0552 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR- 1356
Nota:	Unidad de excelencia María de Maeztu MdM-2015-0552
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Calcification ; Mediterranean Sea ; Carbonates ; Salinity ; Sea water ; Marine ecology ; Calcite ; Scanning electron microscopy
Publicat a:	PloS one, Vol. 13, issue 7 (Jul. 2018) , art. e0201161, ISSN 1932-6203

DOI: 10.1371/journal.pone.0201161
PMID: 30040853

17 p, 5.7 MB

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