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Datos de investigación en: http://hdl.handle.net/10366/143074[EN]Ocean acidifcation is expected to have detrimental consequences for the most abundant calcifying
phytoplankton species Emiliania huxleyi. However, this assumption is mainly based on laboratory
manipulations that are unable to reproduce the complexity of natural ecosystems. Here, E. huxleyi
coccolith assemblages collected over a year by an autonomous water sampler and sediment traps in the
Subantarctic Zone were analysed. The combination of taxonomic and morphometric analyses together
with in situ measurements of surface-water properties allowed us to monitor, with unprecedented
detail, the seasonal cycle of E. huxleyi at two Subantarctic stations. E. huxleyi subantarctic assemblages
were composed of a mixture of, at least, four diferent morphotypes. Heavier morphotypes exhibited
their maximum relative abundances during winter, coinciding with peak annual TCO2 and nutrient
concentrations, while lighter morphotypes dominated during summer, coinciding with lowest TCO2
and nutrients levels. The similar seasonality observed in both time-series suggests that it may be a
circumpolar feature of the Subantarctic zone. Our results challenge the view that ocean acidifcation
will necessarily lead to a replacement of heavily-calcifed coccolithophores by lightly-calcifed ones in
subpolar ecosystems, and emphasize the need to consider the cumulative efect of multiple stressors on
the probable succession of morphotypes.European Union's Horizon 2020, Marie Skłodowska-Curie Individual fellowshi
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