Porcelaneous larger foraminiferal responses to Oligocene-Miocene global changes
Metadatos
Mostrar el registro completo del ítemAutor
Bassi, Davide; Braga Alarcón, Juan Carlos; Pignatti, Johannes; Fujita, Kazuhiko; Nebelsick, James H.; Renema, Willem; Iryu, YasufumiEditorial
Elsevier
Materia
Oligocene-Miocene Larger foraminifera Western Tethys
Fecha
2023Referencia bibliográfica
Palaeogeography, Palaeoclimatology, Palaeoecology 634 (2024) 111916 [10.1016/j.palaeo.2023.11191]
Patrocinador
University of Ferrara (FAR 2020–2022); MIUR-Dipartimenti di Eccellenza 2018–2022 Project; PRIN 2017RX9XXXY (Biota resilience to global change: biomineralization of planktic and benthic calcifiers in the past, present and future); International Research Fellow grant of the Japan Society for the Promotion of Science (JSPS) at the Tohoku University (Sendai)Resumen
Sea surface temperatures (SST) have been identified as a main controlling factor on larger benthic foraminifera
(LBF) living in tropical to sub-tropical shallow-water carbonate and mixed siliciclastic‑carbonate platforms.
Changes in SST, along with those in ocean acidification and nutrient content recorded in the global oceans
throughout their history will not only continue but also be amplified in the future at an unprecedented rate of
change possibly reaching levels found in the geological record. This study focuses on the Oligocene (mean SST 8
ºC higher than present) and the Miocene (SST 5–8 ºC higher than present) epochs which were characterized by a
higher richness in porcelaneous LBF (pLBF) than today. A systematic re-assessment and comprehensive literature
survey of stratigraphic ranges and palaeogeographic distribution in the Western Tethyan (Mediterranean) and
Indo-Pacific regions are used to evaluate the impact of changes in SST, seawater pCO2 and pH on the biodiversity
of the Oligocene–Miocene pLBF Alveolinella, Austrotrillina, Borelis, Bullalveolina, Flosculinella, and Praebullalveolina.
Two peaks in species richness were identified during the Aquitanian and Langhian–Serravallian. These
peaks occurred when SST was ~29 ºC, with pCO2 of ~400 ppm and pH > 7.8. These values are comparable to
those of today. The minima in species richness recorded in the Rupelian–early Chattian, in the Burdigalian and
from the Tortonian onward can be correlated to the detrimental effects of both minimum (< 26 ºC) and
maximum (> 31 ºC) SST thresholds. High pCO2 (> 600 ppm) values, which are limited to the Rupelian–early
Chattian, are also detrimental to species richness. Seawater pH higher than 7.7 did not negatively affect species
richness. These historical trends have serious implications for the future diversity of pLBFs with the increasing
likely scenario of rising SST and pCO2 and lowering of pH values in the near future. These developments can
potentially lead to diversity decrease and even extinction of pLBFs. However, the resilience of present-day pLBF
species to rising SST and pCO2 levels is underpinned by the evolutionary histories of their fossil counterparts
during climate variations, albeit at much different rates of change.