#brGDGTs
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ninadavtian.bsky.social
Congrats to @aecpaleo.bsky.social on her new first authored paper, just published in @egubg.bsky.social!
doi.org/10.5194/bg-2...
With @cindydejonge.bsky.social and @sebjoannin.bsky.social.
Please also check out @sebjoannin.bsky.social’s post! 👇🏻
#brGDGTs #TeamBacteria
@egu.eu
🧪 ⚒️ 🦣 👩‍🔬
#PaleoSky
December 8, 2025 at 8:03 AM
ninadavtian.bsky.social
On this #InternationalWomensDay, let me highlight two 👩‍🔬.
First, @aecpaleo.bsky.social, who leads the following @egu.eu preprint:
egusphere.copernicus.org/preprints/20...
With @cindydejonge.bsky.social among other 👩‍🔬 co-authors.
#GDGTs #brGDGTs #TeamBacteria
🧪 ⚒️ 🦣
#PaleoSky
#IWD #IWD25 #IWD2025
(1/4)
Utilizing Probability Estimates from Machine Learning and Pollen to Understand the Depositional Influences on Branched GDGT in Wetlands, Peatlands, and Lakes
Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) serve as critical molecular biomarkers for the quantitative reconstruction of past environments, ambient temperature and pH across va...
egusphere.copernicus.org
March 8, 2025 at 5:30 PM
ninadavtian.bsky.social
Yanwu Duan is the first author of two new papers which collectively support both #TeamBacteria and #TeamArchaea from the #GDGTs perspective.
Bacterial lipids #brGDGTs paper:
www.sciencedirect.com/science/arti...
Archaeal lipids #isoGDGTs paper:
www.sciencedirect.com/science/arti...
🧪 ⚒️
#PaleoSky
Divergent environmental controls on branched tetraethers along precipitation gradients in soils of the Tibetan Plateau
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are widely used for terrestrial paleotemperature reconstructions, yet their environmental con…
www.sciencedirect.com
November 8, 2025 at 8:48 AM
ninadavtian.bsky.social
Once again, marine tetraether lipids also include bacterial #brGDGTs!
See, for instance, this new marine brGDGT paper by @drxiaowj.bsky.social et al., just published in Geochimica et Cosmochimica Acta:
www.sciencedirect.com/science/arti...
#GDGTs #TeamBacteria
🧪 ⚒️ 🌊
With implications for #PaleoSky
Global distribution of marine bacterial BrGDGTs in sediments: patterns and implications
Branched glycerol dialkyl glycerol tetraethers (brGDGTs), originally linked to terrestrial bacteria for paleoenvironmental reconstructions, are now al…
www.sciencedirect.com
December 10, 2025 at 2:28 PM
ninadavtian.bsky.social
Bacterial tetraether lipids as paleothermometers once again! #brGDGTs

Lauren O’Connor et al. (2024) Science Advances, with @docsabine.bsky.social:
doi.org/10.1126/scia...

🧪 ⚒️ 👩‍🔬
#PaleoSky
Terrestrial evidence for volcanogenic sulfate-driven cooling event ~30 kyr before the Cretaceous–Paleogene mass extinction
Terrestrial proxy evidence for sulfur-induced cooling event linked to Deccan Trap eruptions 30 ka before K–Pg boundary.
doi.org
December 20, 2024 at 2:02 PM
ninadavtian.bsky.social
How to use bacterial membrane lipids, named #brGDGTs, for reliable paleo-temperature reconstructions from Quaternary lake sediments?
The new paper quoted below further addresses this important question! 👇🏻
Congrats @geochemem.bsky.social and co-authors!
#GDGTs #TeamBacteria
🧪 ⚒️ 🦣 👩‍🔬
#PaleoSky
September 19, 2025 at 1:48 PM
freddyschenk.bsky.social
📢New publication co-lead by our PhD students
@helsinki.fi @geohelsinkiuni.bsky.social diving into multi-proxy temperature reconstructions for the Holocene in N-Fennoscandia using #pollen, #macrofossils & #GDGT: www.sciencedirect.com/science/arti...
@bolincentre.bsky.social @utmpaleolab.bsky.social 🧪
A comparison of Holocene temperature reconstructions from vegetation proxies and brGDGTs in northern Fennoscandia
Studies on Holocene climate conditions commonly show discrepancies between different proxy-based reconstructions, calling for in-depth analysis of bot…
www.sciencedirect.com
December 4, 2025 at 2:25 PM
ninadavtian.bsky.social
The Version of Record of the new paper by Sai Ke et al. (2026) Organic Geochemistry is now online, so I re-up this paper too—with @arnaudhuguet.bsky.social as the last author! 👇🏻
#brGDGTs
#3OHFattyAcids
#TeamBacteria
🧪 ⚒️ 👩‍🔬
Implications for #PaleoSky
March 10, 2026 at 7:12 PM
ninadavtian.bsky.social
On this #WorldSoilDay, I re-up my first first-authored paper and its 🧵: 👇🏻
www.sciencedirect.com/science/arti...
While I did not opt for gold open access publication, I did pick the green open access publication path (accepted manuscript):
hal.science/hal-01683011v1
🧪 ⚒️ 👩‍🔬
Implications for #PaleoSky
December 5, 2025 at 1:29 PM
geochemem.bsky.social
🚨New paper!🚨🥳

Delighted to share our new paper out now on global lake brGDGT temperature calibrations: advances, applications and challenges:

www.sciencedirect.com/science/arti...

@hassfacultyncl.bsky.social @bas.ac.uk @ogu-bristol.bsky.social
Development of new global lake brGDGT-temperature calibrations: advances, applications, challenges, and recommendations
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a group of temperature-sensitive membrane lipids found in bacteria that have been widely …
www.sciencedirect.com
September 19, 2025 at 11:59 AM
ninadavtian.bsky.social
Here is a paper led by a former PhD student and which further shows that indicators based on bacterial tetraether lipids in lakes consistently need refinement:
doi.org/10.1029/2025...
With @nemiahladd.bsky.social and @cindydejonge.bsky.social
#brGDGTs #TeamBacteria
🧪 ⚒️ 👩‍🔬
Implications for #PaleoSky
Controls on brGDGT Production in the Seasonally Anoxic Water Column and Sediments of Rotsee (Lake Rot)
MBT'5ME values in Rotsee are influenced by lake stratification while the isomer ratio (IR) more directly reflects epilimnion temperature MBT'5ME and IR are strongly correlated, providing a diagno...
doi.org
December 19, 2025 at 8:56 AM
ninadavtian.bsky.social
On this #InternationalDayOfWomenAndGirlsInScience, here is a great story presented in two papers led by a 👩‍🔬 (Jingjing Guo) and last authored by another 👩‍🔬 (Francien Peterse).
Paper #1: doi.org/10.5194/cp-2...
Paper #2: doi.org/10.1016/j.or...
🧪 ⚒️ 🦣 👩‍🔬
#PaleoSky
#GDGTs #brGDGTs
#IDWGS #IDWGS2025
Towards quantitative reconstruction of past monsoon precipitation based on tetraether membrane lipids in Chinese loess
Abstract. Variations in the oxygen isotope composition (δ18O) of cave speleothems and numerous proxy records from loess–paleosol sequences have revealed past variations in East Asian monsoon (EAM) int...
doi.org
February 11, 2025 at 9:09 AM
ninadavtian.bsky.social
Martens et al. (2026) GCA present a valuable tetraether lipid dataset—isoGDGTs, brGDGTs, and OH-isoGDGTs—to improve our understanding of #TeamArchaea #GDGTs distributions in central Arctic Ocean sediments—surface sediments and sediment cores:
www.sciencedirect.com/science/arti...
🧪 ⚒️ 🌊 🦣
#PaleoSky
Towards understanding archaeal lipid biomarker (GDGT) distributions in central Arctic Ocean sediments
The Arctic is undergoing rapid climate change, warming nearly four times faster than the global average, leading to increasingly ice-free conditions a…
www.sciencedirect.com
June 18, 2026 at 11:36 AM
ninadavtian.bsky.social
I am so glad to be one of the two ICTA-UAB representants—the other is Joan Villanueva—for the interlaboratory study led by @cindydejonge.bsky.social and @francien.bsky.social! #GDGTs #brGDGTs
Let's summarize this important study for #PaleoSky and ⚒️ people with the following thread! 👇🏻 (1/7)
🧪 👩‍🔬
Nina Davtian (that's me!) at her work office, with the laptop screen showing the header of her co-authored article by De Jonge et al. (2024) GGG (https://doi.org/10.1029/2024GC011583) and her index finger showing where her name appears in the author list.
October 24, 2024 at 4:19 PM
bigearthdata.ai
Pleistocene terrestrial warming trend in East Asia linked to Antarctic ice sheets growth
->Nature | #AntarcticIceSheet | More info from EcoSearch
Pleistocene terrestrial warming trend in East Asia linked to Antarctic ice sheets growth
Despite the great potential of brGDGTs for paleotemperature reconstructions, the impacts of non-thermal factors, such as soil input, changes in water-column structure, water chemistry, and bacterial communities, and seasonal bias should be carefully evaluated prior to the quantitative application of...
www.nature.com
September 11, 2025 at 4:49 AM
ninadavtian.bsky.social
And so, this important study for #PaleoSky and ⚒️ people like me is part of the #TopViewedArticle group!
Thank you again Cindy De Jonge and Francien Peterse for leading this #TeamBacteria #brGDGTs round-robin study!
🔗: doi.org/10.1029/2024...
@icta-uab.bsky.social
@climatecerege.bsky.social
🧪 👩‍🔬
(1/3)
May 17, 2026 at 3:19 PM
ninadavtian.bsky.social
This is one of my two @icta-uab.bsky.social papers for 2025, with #TeamBacteria #brGDGTs thanks to me:
www.sciencedirect.com/science/arti...
Too bad the original paper 🔗 posted by @sandranogue.bsky.social does not work. 👇🏻
I will soon post a 🧵 about this paper, so stay tuned!
🧪 ⚒️ 🦣 👩‍🔬
#PaleoSky
(1/2)
June 26, 2026 at 8:59 AM
sebjoannin.bsky.social
With the link: doi.org/10.5194/bg-2...
Utilizing probability estimates from machine learning and pollen to understand the depositional influences on branched GDGT in wetlands, peatlands, and lakes
Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are critical molecular biomarkers for the quantitative reconstruction of past environments, ambient temperature, and pH across variou...
doi.org
December 8, 2025 at 9:28 AM
zanderland.bsky.social
New paper alert! Give it a read if you're interested in lipid biomarkers, paleoclimate, lakes and their sediments, Dansgaard-Oeschger events, or climate of the last glacial period.

cp.copernicus.org/articles/20/...
Reconstruction of warm-season temperatures in central Europe during the past 60 000 years from lacustrine branched glycerol dialkyl glycerol tetraethers (brGDGTs)
Abstract. Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (DO) cycles and Heinrich events, have been extensively studied using ice core and marine proxy ...
cp.copernicus.org
April 9, 2024 at 5:50 PM
terriblelagarto.pmartoza.com
The key finding is: we find evidence of acidobacterial and non-acidobacterial producers of GDGTs.
Link here: track.smtpsendmail.com/9032119/c?p=...
Microbial community response to temperature in microcosm incubations and their associated changes in branched Glycerol Dialkyl Glycerol Tetraether distribution
Abstract. While branched Glycerol Dialkyl Glycerol Tetraethers (brGDGTs) are a useful tool for paleoclimate reconstruction, the factors controlling their d
track.smtpsendmail.com
March 14, 2026 at 5:10 PM
ninadavtian.bsky.social
Here is a #TeamBacteria paper which reviews biases in continental temperature reconstructions based on branched tetraether lipids in soils and proposes an interesting constraint-based approach to improve such reconstructions:
www.sciencedirect.com/science/arti...
#brGDGTs
🧪 ⚒️ 👩‍🔬
#PaleoSky
Mitigating edge effects in paleoclimate reconstructions: a comprehensive review and bias assessment of soil brGDGT-based temperature reconstructions
Classical paleoclimate reconstructions rely on a space-for-time substitution approach, but past environmental conditions may extend beyond modern anal…
www.sciencedirect.com
February 27, 2026 at 2:24 PM
ninadavtian.bsky.social
I want to re-up this #TeamBacteria paper led by @terriblelagarto.pmartoza.com: 👇🏻
doi.org/10.1093/fems...
With @leafwax.bsky.social.
🧪 🦠 🧬
To better know the biological producers of #brGDGTs matters for ⚒️ and #PaleoSky applications.
#GDGTs
April 29, 2026 at 7:35 PM
ninadavtian.bsky.social
In short, Martin et al. (2019) concluded that:
1) Downcore brGDGTs in Lake Saint Front (Massif Central, France) have mixed sources
2) Sources of brGDGTs gradually shifted over the Holocene
3) Vegetation changes and human activities further impact brGDGT distributions in Lake Saint Front
(10/14)
Fig. 5 in Martin et al. (2019) OG (https://doi.org/10.1016/j.orggeochem.2019.06.005). Sedimentological, geochemical, and palynological evolution of the Holocene recorded at Lake St Front. A. Simplified sedimentation rate obtained from the Bacon program. B. Magnetic susceptibility. C. Total Organic Carbon (TOC, Rhoujjati, 1995 https://theses.fr/1995AIX22025). D. Percentage of arboreal pollen (brown curve) and percentages of pollen from thermophilous (beige area, sum of Acer, Corylus, Hedera, Ilex, Lonicera, Ostrya, deciduous Quercus, Quercus ilex t., Pistacia, Sambucus, Sorbus, Tilia, Ulmus, Viburnum, Viscum) and mesophilous (green area, sum of Abies, Carpinus, Fagus) tree pollen. E. Cumulative percentages of pollen of nitrophilous taxa (light green area, Plantago lanceolata, P. major, Rumex, Chenopodiaceae, Urtica), cereals (orange area, Cerealia, Secale), and Juglans (burgundy area). F. C/N ratio (Rhoujjati, 1995 https://theses.fr/1995AIX22025); note that the axis has been reversed for improved readability. The dashed line represents the upper limit of production in the aquatic realm. G. BIT index with analytical errors (1σ values); note that the axis has been reversed. H. Fractional abundance of IIIa″ with analytical errors (1σ values). I. ΣIIIa/ΣIIa ratio (red curve) with analytical errors (1σ values). The dashed lines represent the upper limit of production in the terrestrial realm and the lower limit of production in the aquatic realm defined by Xiao et al. (2016 https://doi.org/10.5194/bg-13-5883-2016). J. 14C calibrated ages and 210Pb dates. Shaded rectangles highlight the periods when ΣIIIa/ΣIIa values are below the upper limit for soil origin. The period of permanent human occupation is marked by a hatched symbol. RP: Roman Period, MP: Modern Period.
December 15, 2024 at 8:05 PM
terriblelagarto.pmartoza.com
Honestly I thought my cloud was going to be a single gigantic "GDGT" 🤣 ⚒️🧪
Cloud of words in various colors and sizes based on the Google Scholar profile for Pablo Martínez-Sosa. Some of the largest words include lacustrine, branched, environmental, gdgt, response, brgdgt, brgdgts, gdgts, organic, paleoenvironmental, proxies, soil, temperature, bayesian, calibration, determining, development, effect, global, impact, lake, learning, machine, mesocosm, microcosms, orizaba, pico, quality, reworking, and sediments
November 26, 2024 at 12:42 PM
ninadavtian.bsky.social
It's #WorldSoilDay! Let’s re-up my first first-authored paper from my PhD at Aix-Marseille Univ @climatecerege.bsky.social, with its 🧵 👇🏻:
doi.org/10.1016/j.or...
No worries if you are paywalled, as I provided the accepted manuscript here:
hal.science/hal-01683011
🧪 ⚒️ 👩‍🔬
Implications for #PaleoSky
December 5, 2024 at 9:49 AM