2026-08-27T00:45:05Zhttps://gredos.usal.es/oai/request

oai:gredos.usal.es:10366/1429952025-04-30T20:40:16Zcom_10366_140283com_10366_4512com_10366_3823col_10366_140284

00925njm 22002777a 4500 dc Rigual Hernández, Andrés Salvador author Trull, Thomas W. author Flores Villarejo, José Abel author Nodder, Scott D. author Eriksen, Ruth S. author Davies, Diana M. author Hallegraeff, G. M. author Sierro Sánchez, Francisco Javier author Patil, S. M. author Cortina, A. author Ballegeer, Anne-Marie Clara author Northcote, Lisa C. author Abrantes, Fátima author Rufino, M. M. author 2020 [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. Rigual-Hernández, A.S., Trull, T.W., Flores, J.A., Nodder, S.D., Eriksen, R., Davies, D.M., Hallegraeff, G.M., Sierro, F.J., Patil, S.M., Cortina, A., Ballegeer, A.M., Northcote, L.C., Abrantes, F., Rufino, M.M., (2020). Full annual monitoring of Subantarctic Emiliania huxleyi populations reveals highly calcified morphotypes in high-CO2 winter conditions. Scientific Reports 10, 2594. http://hdl.handle.net/10366/142995 10.1038/s41598-020-59375-8 2045-2322 Carbon cycle Marine biology Full annual monitoring of Subantarctic Emiliania huxleyi populations reveals highly calcified morphotypes in high-CO2 winter conditions