000153058 001__ 153058
000153058 005__ 20250410160821.0
000153058 0247_ $$2doi$$a10.1016/j.palaeo.2025.112867
000153058 0248_ $$2sideral$$a143432
000153058 037__ $$aART-2025-143432
000153058 041__ $$aeng
000153058 100__ $$aSigismondi, Silvia
000153058 245__ $$aEvaluating planktic foraminiferal resilience during the Middle Eocene Climatic Optimum (MECO) in the Atlantic Ocean
000153058 260__ $$c2025
000153058 5203_ $$aThe Middle Eocene Climatic Optimum (MECO), centered around ∼40 Ma, is characterized by a steady decline in marine bulk and benthic carbonate δ18O values by approximately ∼1 ‰ over ∼400 kyr. This is typically interpreted as a 3–6 °C increase in global temperatures, followed by a rapid return to pre-event conditions. This event is increasingly attracting scientific attention, as it represents a natural experiment of the temperatures and pCO2 levels that Earth may reach by the end of this century if anthropogenic greenhouse gas emissions are not reduced. The δ13C signal, along with biotic and paleoceanographic changes across the MECO, exhibits significant geographic heterogeneity, making this event still enigmatic. In particular, the biotic response remains poorly constrained. Here, we aim to address this gap by focusing on planktic foraminifera, which are highly sensitive to the physical and chemical state of the oceans and can offer a valuable long-term perspective on marine ecosystem resilience to global warming. We selected Ocean Drilling Program Sites 1051, 1263, and 702, which cover different latitudinal settings across the Atlantic Ocean and provide established age models and stable isotope constraints. Planktic foraminifera display a pronounced assemblage turnover across the MECO, primarily related to an increase in surface-water temperature that altered pelagic food webs. The intense warming caused a southward migration of warm-index taxa at Site 702, as also recorded for calcareous nannofossils. The warm-index “Large Acarinina” (>150 μm) shows a marked and permanent decline within ∼250 kyr during the late stage of the MECO at Sites 1051 and 702, approximately 2 Myr before their evolutionary disappearance at the Bartonian-Priabonian boundary. This decline is widespread, being also recorded in the Tethys. We speculate that changes in microalgal symbionts may have impacted the success of this group. We also document a drop in the abundance of the genus Chiloguembelina, possibly related to enhanced oxygenation of its ecological niche, the oxygen deficient zone (ODZ). The planktic foraminiferal assemblages, though demonstrating some degree of plasticity by absorbing periodic stress extremes through community modifications and latitudinal migration, did not recover their pre-disturbance state. This indicates low stability during the MECO event and ultimately lack of resilience.
000153058 536__ $$9info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2019-105537RB-I00$$9info:eu-repo/grantAgreement/ES/MICINN/PID2023-149894OB-I00
000153058 540__ $$9info:eu-repo/semantics/closedAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000153058 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000153058 700__ $$aLuciani, Valeria
000153058 700__ $$0(orcid)0000-0002-8801-9544$$aAlegret, Laia$$uUniversidad de Zaragoza
000153058 700__ $$aWesterhold, Thomas
000153058 7102_ $$12000$$2655$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Paleontología
000153058 773__ $$g667 (2025), 112867$$pPalaeogeogr. palaeoclimatol. palaeoecol.$$tPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY$$x0031-0182
000153058 8564_ $$s2278420$$uhttps://zaguan.unizar.es/record/153058/files/texto_completo.pdf$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2027-03-28
000153058 8564_ $$s2295807$$uhttps://zaguan.unizar.es/record/153058/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2027-03-28
000153058 909CO $$ooai:zaguan.unizar.es:153058$$particulos$$pdriver
000153058 951__ $$a2025-04-10-14:03:47
000153058 980__ $$aARTICLE