Andrej Spiridonov
AndrejPaleobio@ecoevo.social
<p>Professor of paleontology and Earth systems at Vilnius University. My interests are: theoretical paleontology, evolution, geology, stratigraphy, philosophy of biology and geology, climate at scales great and small.</p>
Posts
-
Post #4417113
More reasons to end Russo-Ukrainian and USA-Iran wars: "..most conflicts exhibit periods of relative stasis, each additional year of fighting carries roughly a 10% ex ante risk of a doubling in severity and about a 1% risk of increasing by an order of magnitude" https://doi.org/10.1126/sciadv.aeb1705 🧪 #Complexity
-
Post #4375950
Glad to share our new study at "Nature Communications" which resulted from several workshops on the early warning signs of mass extinctions and coordination of macroevolutionary vulnerability and the states of carbon cycle and temperatures. https://www.nature.com/articles/s41467-026-75655-9 🧪⚒️ #Geology #Paleobio #EvoBio
-
Post #4349875
Blanketing effects of the fine dust which condensed just after the K-Pg impact. The dust enhanced (by reflecting thermal radiation backwards) the microspherule re-entry-caused heating of the Earth's surface, which caused global fires. https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2026JG009837
-
Post #4250132
Oak tree bark as a visual metaphor of the geobiome dynamics modulating multi-level allopatry in 1D space (horizontal) and time (vertical). More details: https://doi.org/10.1017/pab.2023.37
-
Post #4165361
Internal decline and the final punch of mass extinctions in the extinction of clades. "Once proportional diversity fell below a critical threshold (mean of approximately 0.13), major abiotic perturbations acted as the ‘last straw’," https://nature.com/articles/s41559-026-03134-x
-
Post #4117296
"appearance of the new apex predator cf. Saurosphargidae relatively soon after the [P\Tr] extinction event coincides with the reappearance of predatory cephalopods and precedes the full ecological and taxonomic recovery of benthic groups in the Dolomites" https://tandfonline.com/doi/full/10.1080/02724634.2026.2685335 🧪⚒️ #Paleobio
-
Post #3996130
Dark palynomorphs from the dark period of the history of life: "Continental-scale fern savannah wildfires during the end-Triassic mass extinction suggests ...heat stress, and periods of prolonged drought alternating with extreme precipitation..." https://www.nature.com/articles/s41561-026-02048-4
-
Post #3985817
Every field geologist and paleontologist will understand 😅
-
Post #3979564
Laisvės Alėja (Freedom Alley), Kaunas, Lithuania. Sculpture of geologist [my honest guess].
-
Post #3883818
"...results contrast with the common view that the geo-logically stable Proterozoic Era experienced little eukaryotic evolutionary innovation and indicate that all current supergroups were already established in the Mesoproterozoic." 🧪⚒️ #Geology #Paleobio https://www.pnas.org/doi/epdf/10.1073/pnas.2600283123
-
Post #3883770
A new study re-evaluating size of the legendary Liopleurodon ferox. This should have been highly-unusual macropredator. Just look at these teeth! Look at the scale. The smallest are the size of lion fangs, and the largest look like tusks. https://www.tandfonline.com/doi/full/10.1080/02724634.2026.2691149?af=R#abstract
-
Post #3855804
The fossil record of amber really track an "immune system" of plants. The earliest amber from the Middle Devonian of China. https://www.science.org/doi/10.1126/sciadv.aeh1266
-
Post #3831126
Special, and dearest to my heart, kind of paleontology which is known by very few
-
Post #3811454
All biologists should thank uncle Charles 😄
-
Post #3781023
Such a sad news. RIP Sam Neill (1947 – 2026).
-
Post #3750076
A new genus of giant salamanders from Japan--Limnospondylus ajimuensis https://peerj.com/articles/21362/ from Pliocene. Currently there are just two genera. Reminds us of significant depletion of taxa during transition to ice ages. One even lived in Europe - Ukrainurus - "Ukrainian tail".
-
Post #3491495
Many interesting talks at the EAVP23 at Vilnius. Dirley Cortes presents new data on the origins of extremely long-necked elasmosaurs. She also gave very interesting background of predator rich Early Cretaceous ecosystems of marine Colombia, with longest trophic chains.
-
Post #3450967
Looks like a cool study on monitor biting biomechanics. There you can find some extrapolations for the Megalania bite force which seems to overlap with that of leopard of wolf. https://academic.oup.com/biolinnean/article/148/2/blag036/8707149?login=false
-
Post #3440751
Interesting paper on Abelisaurid ornamentation: "...ordered evolutionary patterns in cranial ornamentation that are more consistent with expectations of sexual selection than with the stochastic patterns predicted under the species recognition hypothesis." https://doi.org/10.1017/pab.2026.10099
-
Post #2544699
RE: https://gruene.social/@jon/116465317138450928 I would guess, the longest *optimal* journey
-
Post #2544698
Major transitions in AI as Existential threats. Who said that the theory is useless? 😃 &quot;..trends through the theory of major evolutionary transitions and suggest that eAI could mark a shift in the units and substrates of evolution—a possible “Life 2.0.”&quot; https://www.pnas.org/doi/pdf/10.1073/pnas.2527700123
-
Post #2544697
The definition of the Black Swan Event
-
Post #2544696
Had a great discussion on the problem of the de-extinction in the physics and natural sciences students conference &quot;Open Readings 2026&quot;.
-
Post #2544695
Today is the constitution day of the Polish-Lithuanian Commonwealth. Litwo! Ojczyzno moja! ty jesteś jak zdrowie; Ile cię trzeba cenić, ten tylko się dowie, Kto cię stracił. Dziś piękność twą w całej ozdobie Widzę i opisuję, bo tęsknię po tobie. Pan Tadeusz (1834) Adam Mickiewicz
-
Post #2544694
Anybody at the EGU26?
-
Post #2544693
Great talk by Jason J. Head on the use of the ecomorphology of reptiles in reconstructing past climate. Most of us are familiar with mammal ecometrics. But maybe the age of reptile ecometrics is nearing? 😎
-
Post #2544692
My first origami, folded with the lead by the master Yohei Sugimura from the Japan Geoscience Union 🙂
-
Post #2544691
Interesting study exploring limiting effects of toxic compounds on the macroevolution of animals. In evolution, you need to wait for the mergence of suitable conditions. Sleeping beauty of macroevolution. https://academic.oup.com/nsr/article/11/8/nwae237/7710134
-
Post #2544689
Interesting Alfred Wegener Medal talk by Thomas Stocker at EGU26. He presented an Odyssey of explaining Last Glacial millennial scale Dansgaard–Oeschger Events, as it turns out the dynamical systems simulations shown how they can self-sustain themselves at certain conditions.
-
Post #2544688
Three great nonlinear geophysicists and winners of the Lewis Fry Richardson Medal: Shaun Lovejoy (2019) Daniel Schertzer (2015) Anastasios Tsonis (2026) Also Anastasios presents his medal lecture &quot;On the Origins of Randomness&quot; at EGU26.