Morphological recognition of Globigerinoides ruber morphotypes and their susceptibility to diagenetic alteration in the eastern Mediterranean Sea

Kontakiotis, George; Antonarakou, Assimina; Mortyn, P. Graham; Drinia, Hara; Anastasakis, George; Zarkogiannis, Stergios D.; Möbius, Jürgen

doi:10.1016/j.jmarsys.2017.05.005

Cited by 36 publications

(23 citation statements)

References 88 publications

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“…Late Miocene sea surface temperature (SST) records are sparse, and only one deals with the Mediterranean (Tzanova et al, ). Foraminifera stable oxygen isotope and Mg/Ca proxies suffer from biases (preservation, diagenesis, and salinity) in the Mediterranean realm, which render them insufficient for SST reconstructions (Antonarakou, Kontakiotis, Zarkogiannis, et al, , Antonarakou, Kontakiotis, Vasilatos, et al, ; Kontakiotis et al, , Kontakiotis, Mortyn, et al, , Kontakiotis et al, ). Alkenone paleothermometry (U K′ 37 ‐index‐based SST) appears more suitable/less biased in the Mediterranean Sea (Herbert et al, ) although those alkenones were produced by extinct species of haptophytes (Athanasiou et al, ; Herbert et al, ; Tzanova et al, ).…”

Section: Introductionmentioning

confidence: 99%

Large Sea Surface Temperature, Salinity, and Productivity‐Preservation Changes Preceding the Onset of the Messinian Salinity Crisis in the Eastern Mediterranean Sea

Vasiliev

Karakitsios

Bouloubassi

et al. 2019

Paleoceanog and Paleoclimatol

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The Messinian Salinity Crisis (MSC; 5.97–5.33 Ma) is an enigmatic episode of paleoceanographic change, when kilometer‐thick evaporite units were deposited in the Mediterranean basin. Here we use geochemical (biomarker and isotope) data to reconstruct sea surface temperature, salinity, and productivity‐preservation changes in the Mediterranean basin just before the MSC. The proxy data indicate that the Mediterranean Sea was significantly saltier and colder between 6.415 and 6.151 Ma, than between 6.151 and 5.971 Ma. Salinity decrease at 6.151 Ma seems to be a relatively fast event just preceding the inception of a warming phase that lasted almost uninterrupted until the MSC onset. The water exchange with the Paratethys could have caused, along with the African rivers, an increased freshwater supply, resulting in normal marine Mediterranean waters between 6.151 and 5.971 Ma, despite the severe restriction of marine connections with the Atlantic at that time. Sea surface temperature changes determined a sharp drop in productivity and/or preservation of organic matter, marked by deposition of calcareous marls. Productivity and preservation were relatively high and constant until 6.01 Ma. Afterward, increased influx of terrestrial organic matter and probably enhanced water column stratification prevailed. Around 5.971 Ma, modifications in aquatic versus terrestrially derived biomarkers indicate changes in organic matter influx at the MSC onset.

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Section: Introductionmentioning

confidence: 99%

Large Sea Surface Temperature, Salinity, and Productivity‐Preservation Changes Preceding the Onset of the Messinian Salinity Crisis in the Eastern Mediterranean Sea

Vasiliev

Karakitsios

Bouloubassi

et al. 2019

Paleoceanog and Paleoclimatol

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“…In such mar ginal bas ins, the suc ces sive fau nal zones can be in di cated as ecozones, because the ma jor ity of the spe cies are sen si tive in di ca tors of past en vi ron men tal changes with am pli fied sig nals (Drinia and Antonarakou, 2003;Antonarakou et al, 2007Antonarakou et al, , 2018Antonarakou et al, , 2019Drinia et al, 2007Drinia et al, , 2008Drinia et al, , 2016Kontakiotis, 2012Kontakiotis, , 2016Kontakiotis et al, 2013Kontakiotis et al, , 2016aKontakiotis et al, , b, 2017Fenton et al, 2016;Karakitsios et al, 2017a, b). The eco log i cal di ver gence between the spe cies (Hemleben et al, 1989;Rohling et al, 1993), even be tween dif fer ent morphotypes of the same spe cies (Antonarakou et al, 2015;Kontakiotis et al, 2017), de ter mined by dif fer ent con trol ling fac tors (e.g., depth hab i tats, growth op timum/stressed con di tions, pro duc tiv ity, strat i fi ca tion, near-/offshore-con di tions), in com bi na tion with their dif fer ent test morpho logies (e.g., re lated to shell shape and size, thick ness, in ner po ros ity and pore sur face dis tri bu tion; Morard et al, 2009;Kontakiotis et al, 2017), con trol di rectly their dis tri bu tion pat tern and re flect the re gional cli mate vari abil ity (Marcott et al, 2013). There fore, this study uses the con cept of "as sem blage eco-biozones" to re fer to the eco log i cal re sponse of plank tonic foraminifera to en vi ron men tal changes, rather than evo lu tionary changes.…”

Section: Discussion Eco-biostratigraphic Approach In Subtropical Margmentioning

confidence: 99%

“…All the sed i ment sam ples were washed with run ning wa ter through a 63 µm sieve. Af ter wash ing and dry ing at 50°C, the sam ples were sieved and the >125 µm size frac tion was split with an Otto mi cro-split ter into aliquots, from which at least 300 spec i mens The top-right in set shows the names of the main cur rents, as de scribed in the text of plank tonic foraminifera were picked, iden ti fied and counted us ing morphospecies-spe cific and/or spe cial ized tax o nomic ref er ences (Ken nett and Srinivasan, 1983;Hemleben et al, 1989;Kontakiotis et al, 2017). The num ber of plank tonic foraminifera counted is sta tis ti cally re li able for both ecobiostratigraphic and palaeoclimatic re con struc tions (Pat ter son and Fishbein, 1989;Capotondi et al, 1999;Drinia and Antonarakou, 2003;Sprovieri et al, 2003;Sbaffi et al, 2004;Budillon et al, 2009;Triantaphyllou et al, 2009;Siani et al, 2010;Drinia et al, 2016;Bonfardeci et al, 2018).…”

Section: Micropalaeontological Analysesmentioning

confidence: 99%

Eco-biostratigraphic advances in late Quaternary geochronology and palaeoclimate: the marginal Gulf of Mexico analogue

Antonarakou

Kontakiotis

Karageorgis

et al. 2019

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As so ci ate ed i tor: Wojciech Granoszewski This study com bines high-res o lu tion plank tonic foraminiferal eco-biostratigraphy and palaeoclimatic data from the high-sed imen ta tion-rate core JPC-26 from the north west ern mar gin of the Gulf of Mex ico (GoM). The eco-biozones rec og nized (GOMPFE1-12) be ing cor re lated with pub lished Mg/Ca-based sea sur face tem per a tures. This up dated palaeoclimatic and strati graphic ref er ence re cord fa cil i tates cor re la tions with the Green land ice core events and their cli ma tic re la tion ships, and also pro vides a solid strati graphic frame work for cor re la tions with other palaeoclimatic and palaeoceanographic re cords in the circum-GOM/Ca rib bean re gion. This multidisciplinary ap proach un der lines the util ity of sup port ing con ven tional dat ing meth od ol o gies with dif fer ent con straints, and fur ther re veals a pow er ful tool for re li ably cor re lat ing ma rine re cords be tween com pa ra ble deep-sea mar ginal set tings and co eval se quences of this re gion. Key words: in te grated stra tig ra phy, Late Glacial-Holocene tran si tion, plank tonic foraminiferal eco-bioevents, deep-sea sed imen tary cor re la tions, cli mate vari abil ity, palaeoceanography.

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“…Specimens used for analyses were G. ruber sensu stricto (Morphotype A; Kontakiotis et al, 2017) selected from the size fraction 150 -250 μm. Surface seawater samples for stable oxygen isotopes were collected every 60 minutes from the same pump, resulting in a set of 309 samples.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of isotopes and elements in planktonic foraminifera from the Mediterranean Sea as recorders of seawater oxygen isotopes and salinity

Dämmer¹,

Nooijer²,

Sebille³

et al. 2020

Preprint

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Abstract. The Mediterranean Sea is characterized by a relatively strong west to east salinity gradient, which makes it an area suitable to test the effect of salinity on foraminiferal shell geochemistry. We collected living specimens of the planktonic foraminifer Globigerinoides ruber (white) to analyse the relation between element/Ca ratios, stable oxygen isotopes of their shells and surface seawater salinity, isotopic composition and temperature. The oxygen isotopes of sea surface water correlate with salinity in the Mediterranean also during winter, when sampled for this study. Sea water oxygen and hydrogen isotopes are positively correlated in both the eastern and western Mediterranean Sea, though especially in the eastern part the relationship differs from values reported previously for that area. The slope between salinity and seawater oxygen isotopes is lower than previously published. Still, despite the rather modest slope, seawater and foraminiferal carbonate oxygen isotopes are correlated in our dataset although with large residuals and high residual variability. This scatter can be due to either biological variability in vital effects or environmental variability. Numerical models backtracking particles show ocean current driven mixing of particles of different origin might dampen sensitivity and could result in an offset caused by horizontal transport. Results show that Na/Ca is positively correlated to salinity and independent of temperature. Foraminiferal Mg/Ca increases with temperature, as expected, and in line with earlier calibrations, also in the high salinity environment. By using living foraminifera during winter, the previously established Mg/Ca-temperature calibration is extended to temperatures below 18 °C, which is a fundamental prerequisite of using single foraminifera for reconstructing past seasonality.

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Morphological recognition of Globigerinoides ruber morphotypes and their susceptibility to diagenetic alteration in the eastern Mediterranean Sea

Cited by 36 publications

References 88 publications

Large Sea Surface Temperature, Salinity, and Productivity‐Preservation Changes Preceding the Onset of the Messinian Salinity Crisis in the Eastern Mediterranean Sea

Large Sea Surface Temperature, Salinity, and Productivity‐Preservation Changes Preceding the Onset of the Messinian Salinity Crisis in the Eastern Mediterranean Sea

Eco-biostratigraphic advances in late Quaternary geochronology and palaeoclimate: the marginal Gulf of Mexico analogue

Evaluation of isotopes and elements in planktonic foraminifera from the Mediterranean Sea as recorders of seawater oxygen isotopes and salinity

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