Temperature effects on sinking velocity of different Emiliania huxleyi strains
Rosas Navarro, Anaid (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Langer, Gerald (The Marine Biological Association of the United Kingdom)
Ziveri, Patrizia (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)

Fecha:	2018
Resumen:	The sinking properties of three strains of Emiliania huxleyi in response to temperature changes were examined. We used a recently proposed approach to calculate sinking velocities from coccosphere architecture, which has the advantage to be applicable not only to culture samples, but also to field samples including fossil material. Our data show that temperature in the sub-optimal range impacts sinking velocity of E. huxleyi. This response is widespread among strains isolated in different locations and moreover comparatively predictable, as indicated by the similar slopes of the linear regressions. Sinking velocity was positively correlated to temperature as well as individual cell PIC/POC over the sub-optimum to optimum temperature range in all strains. In the context of climate change our data point to an important influence of global warming on sinking velocities. It has recently been shown that seawater acidification has no effect on sinking velocity of a Mediterranean E. huxleyi strain, while nutrient limitation seems to have a small negative effect on sinking velocity. Given that warming, acidification, and lowered nutrient availability will occur simultaneously under climate change scenarios, the question is what the net effect of different influential factors will be. For example, will the effects of warming and nutrient limitation cancel? This question cannot be answered conclusively but analyses of field samples in addition to laboratory culture studies will improve predictions because in field samples multi-factor influences and even evolutionary changes are not excluded. As mentioned above, the approach of determining sinking rate followed here is applicable to field samples. Future studies could use it to analyse not only seasonal and geographic patterns but also changes in sinking velocity over geological time scales.
Ayudas:	Ministerio de Economía y Competitividad CTM2016-79547-R Ministerio de Economía y Competitividad MDM2015-0552 European Commission 265103 European Commission 267931 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1588
Nota:	Unidad de excelencia María de Maeztu MdM-2015-0552
Nota:	Altres ajuts: NERC/NE/N011708/1
Derechos:	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.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	PloS one, Vol. 13, issue 3 (March 2018) , e0194386, ISSN 1932-6203

DOI: 10.1371/journal.pone.0194386
PMID: 29558495

18 p, 2.2 MB

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